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Reteach Book Grade 1 PROVIDES Tier 1 Intervention for Every Lesson Copyright © by Houghton Mifflin Harcourt Publishing Company All rights reserved. No part of the material protected by this copyright may be reproduced or utilized in any form or by any means, electronic or mechanical, including photocopying, recording, broadcasting or by any other information storage and retrieval system, without written permission of the copyright owner unless such copying is expressly permitted by federal copyright law. Only those pages that are specifically enabled by the program and indicated by the presence of the print icon may be printed and reproduced in classroom quantities by individual teachers using the corresponding student’s textbook or kit as the major vehicle for regular classroom instruction. HOUGHTON MIFFLIN HARCOURT and the HMH Logo are trademarks and service marks of Houghton Mifflin Harcourt Publishing Company. You shall not display, disparage, dilute or taint Houghton Mifflin Harcourt trademarks and service marks or use any confusingly similar marks, or use Houghton Mifflin Harcourt marks in such a way that would misrepresent the identity of the owner. Any permitted use of Houghton Mifflin Harcourt trademarks and service marks inures to the benefit of Houghton Mifflin Harcourt Publishing Company. All other trademarks, service marks or registered trademarks appearing on Houghton Mifflin Harcourt Publishing Company websites are the trademarks or service marks of their respective owners. Contents CRITICAL AREA 1: Operations and Algebraic Thinking Chapter 1: Addition Concepts 1.1 Algebra • Use Pictures to Add To ..................................................................R1 1.2 Model Adding To .........................................................................................R2 1.3 Model Putting Together ................................................................................R3 1.4 Problem Solving • Model Addition ...............................................................R4 1.5 Algebra • Add Zero ....................................................................................R5 1.6 Algebra • Add in Any Order .........................................................................R6 1.7 Algebra • Put Together Numbers to 10 ..........................................................R7 1.8 Addition to 10.............................................................................................R8 Chapter 2: Subtraction Concepts 2.1 Use Pictures to Show Taking From .................................................................R9 2.2 Model Taking From ....................................................................................R10 2.3 Model Taking Apart ...................................................................................R11 2.4 Problem Solving • Model Subtraction .........................................................R12 2.5 Use Pictures and Subtraction to Compare .....................................................R13 2.6 Subtract to Compare .................................................................................R14 2.7 Subtract All or Zero ...................................................................................R15 2.8 Algebra • Take Apart Numbers ...................................................................R16 2.9 Subtraction from 10 or Less ........................................................................R17 Chapter 3: Addition Strategies 3.1 Algebra • Add in Any Order .......................................................................R18 3.2 Count On .................................................................................................R19 3.3 Add Doubles ............................................................................................R20 3.4 Use Doubles to Add ...................................................................................R21 3.5 Doubles Plus 1 and Doubles Minus 1 ............................................................R22 3.6 Practice the Strategies ...............................................................................R23 3.7 Add 10 and More ......................................................................................R24 3.8 Make a 10 to Add......................................................................................R25 3.9 Use Make a 10 to Add ...............................................................................R26 3.10 Algebra • Add 3 Numbers..........................................................................R27 3.11 Algebra • Add 3 Numbers..........................................................................R28 3.12 Problem Solving • Use Addition Strategies ..................................................R29 Reteach © Houghton Mifflin Harcourt Publishing Company iii Grade 1 Chapter 4: Subtraction Strategies 4.1 Count Back ..............................................................................................R30 4.2 Think Addition to Subtract...........................................................................R31 4.3 Use Think Addition to Subtract.....................................................................R32 4.4 Use 10 to Subtract ....................................................................................R33 4.5 Break Apart to Subtract..............................................................................R34 4.6 Problem Solving • Use Subtraction Strategies..............................................R35 Chapter 5: Addition and Subtraction Relationships 5.1 Problem Solving • Add or Subtract ............................................................R36 5.2 Record Related Facts ................................................................................R37 5.3 Identify Related Facts ................................................................................R38 5.4 Use Addition to Check Subtraction ...............................................................R39 5.5 Algebra • Unknown Numbers .....................................................................R40 5.6 Algebra • Use Related Facts ......................................................................R41 5.7 Choose an Operation .................................................................................R42 5.8 Algebra • Ways to Make Numbers to 20 ......................................................R43 5.9 Algebra • Equal and Not Equal ...................................................................R44 5.10 Facts Practice to 20 ..................................................................................R45 Reteach © Houghton Mifflin Harcourt Publishing Company iv Grade 1 CRITICAL AREA 2: Number and Operations in Base Ten Chapter 6: Count and Model Numbers 6.1 Count by Ones to 120 ...............................................................................R46 6.2 Count by Tens to 120 ................................................................................R47 6.3 Understand Ten and Ones ..........................................................................R48 6.4 Make Ten and Ones...................................................................................R49 6.5 Tens .......................................................................................................R50 6.6 Tens and Ones to 50 .................................................................................R51 6.7 Tens and Ones to 100 ...............................................................................R52 6.8 Problem Solving • Show Numbers in Different Ways .....................................R53 6.9 Model, Read, and Write Numbers from 100 to 110.........................................R54 6.10 Model, Read, and Write Numbers from 110 to 120.........................................R55 Chapter 7: Compare Numbers 7.1 Algebra • Greater Than .............................................................................R56 7.2 Algebra • Less Than .................................................................................R57 7.3 Algebra • Use Symbols to Compare ............................................................R58 7.4 Problem Solving • Compare Numbers ........................................................R59 7.5 10 More, 10 Less......................................................................................R60 Chapter 8: Two-Digit Addition and Subtraction 8.1 Add and Subtract Within 20 ........................................................................R61 8.2 Add Tens .................................................................................................R62 8.3 Subtract Tens ...........................................................................................R63 8.4 Use a Hundred Chart to Add .......................................................................R64 8.5 Use Models to Add ....................................................................................R65 8.6 Make Ten to Add .......................................................................................R66 8.7 Use Place Value to Add ..............................................................................R67 8.8 Problem Solving • Addition Word Problems .................................................R68 8.9 Related Addition and Subtraction .................................................................R69 8.10 Practice Addition and Subtraction ................................................................R70 Reteach © Houghton Mifflin Harcourt Publishing Company v Grade 1 CRITICAL AREA 3: Measurement and Data Chapter 9: Measurement 9.1 Order Length ............................................................................................R71 9.2 Indirect Measurement ................................................................................R72 9.3 Use Nonstandard Units to Measure Length ....................................................R73 9.4 Make a Nonstandard Measuring Tool ............................................................R74 9.5 Problem Solving • Measure and Compare ...................................................R75 9.6 Time to the Hour .......................................................................................R76 9.7 Time to the Half Hour .................................................................................R77 9.8 Tell Time to the Hour and Half Hour ..............................................................R78 9.9 Practice Time to the Hour and Half Hour .......................................................R79 Chapter 10: Represent Data 10.1 Read Picture Graphs .................................................................................R80 10.2 Make Picture Graphs .................................................................................R81 10.3 Read Bar Graphs ......................................................................................R82 10.4 Make Bar Graphs ......................................................................................R83 10.5 Read Tally Charts ......................................................................................R84 10.6 Make Tally Charts......................................................................................R85 10.7 Problem Solving • Represent Data.............................................................R86 Reteach © Houghton Mifflin Harcourt Publishing Company vi Grade 1 CRITICAL AREA 4: Geometry Chapter 11: Three-Dimensional Geometry 11.1 Three-Dimensional Shapes .........................................................................R87 11.2 Combine Three-Dimensional Shapes ............................................................R88 11.3 Make New Three-Dimensional Shapes ..........................................................R89 11.4 Problem Solving • Take Apart Three-Dimensional Shapes ..............................R90 11.5 Two-Dimensional Shapes on Three-Dimensional Shapes ..................................R91 Chapter 12: Two-Dimensional Geometry 12.1 Sort Two-Dimensional Shapes .....................................................................R92 12.2 Describe Two-Dimensional Shapes...............................................................R93 12.3 Combine Two-Dimensional Shapes ..............................................................R94 12.4 Combine More Shapes...............................................................................R95 12.5 Problem Solving • Make New Two-Dimensional Shapes.................................R96 12.6 Find Shapes in Shapes ...............................................................................R97 12.7 Take Apart Two-Dimensional Shapes ............................................................R98 12.8 Equal or Unequal Parts...............................................................................R99 12.9 Halves ...................................................................................................R100 12.10 Fourths ................................................................................................. R101 Reteach © Houghton Mifflin Harcourt Publishing Company vii Grade 1 End-of-Year Resources Getting Ready for Grade 2 Lesson 1 Lesson 2 Lesson 3 Lesson 4 Lesson 5 Lesson 6 Lesson 7 Lesson 8 Lesson 9 Lesson 10 Lesson 11 Lesson 12 Lesson 13 Lesson 14 Lesson 15 Lesson 16 Lesson 17 Lesson 18 Lesson 19 Lesson 20 Reteach © Houghton Mifflin Harcourt Publishing Company Algebra • Ways to Expand Numbers. . Identify Place Value . . . . . . . . . . Use Place Value to Compare Numbers Algebra • Addition Function Tables. . . Algebra • Subtraction Function Tables . Algebra • Follow the Rule . . . . . . . Add 3 Numbers . . . . . . . . . . . . . Add a One-Digit Number to a Two-Digit Number . . . . . . . . . . . . Add Two-Digit Numbers . . . . . . . . . Repeated Addition . . . . . . . . . . . Use Repeated Addition to Solve Problems . . . . . . . . . . . . . Choose a Non-Standard Unit to Measure Length . . . . . . . . . Use a Non-Standard Ruler . . . . . . . Compare Lengths . . . . . . . . . . . . Time to the Hour and Half Hour . . . . Use a Picture Graph. . . . . . . . . . . Use a Bar Graph . . . . . . . . . . . . Take a Survey . . . . . . . . . . . . . . Identify Shapes . . . . . . . . . . . . . Equal Shares . . . . . . . . . . . . . . viii . . . . . . . . . . . . . . . . . . . . . .GRR1 .GRR2 .GRR3 .GRR4 .GRR5 .GRR6 .GRR7 . . . .GRR8 . . . .GRR9 . . . GRR10 . . . GRR11 . . . . . . . . . . . . . . . . . . . . . . . . . . . GRR12 GRR13 GRR14 GRR15 GRR16 GRR17 GRR18 GRR19 GRR20 Grade 1 Lesson 1.1 Reteach Name Algebra • Use Pictures to Add To 3 cows and 2 more cows 5 cows. — Draw circles around the animals added to the group. Write how many. 1. 3 cats and 4 more cats — cats 2 bees and 2 more bees — bees 5 dogs and 1 more dog — dogs 2. 3. Reteach © Houghton Mifflin Harcourt Publishing Company R1 Grade 1 Lesson 1.2 Reteach Name Model Adding To 1 frog and 1 + 2 more frogs Use to show adding to. Draw the Write the sum. 1. 3 horses and 4 more horses + 3 3 =— 2 . = — 1 = — 1 = — 4 2. 1 bee and 1 more bee + 1 3. 4 cows and 1 more cow 4 Reteach © Houghton Mifflin Harcourt Publishing Company + R2 Grade 1 Lesson 1.3 Reteach Name Model Putting Together Use to add two groups. Put the groups together to find how many. There are 3 brown dogs. There is 1 white dog. 3+1=4 How many dogs are there? 4 — dogs to solve. Draw to show your work. Use Write how many. 1. There are 4 black bears and 3 brown bears. How many bears are there? — 4+3=— bears 2. There are 6 red flowers and 2 white flowers. How many flowers are there? — 6+2=— flowers Reteach © Houghton Mifflin Harcourt Publishing Company R3 Grade 1 Lesson 1.4 Reteach Name Problem Solving • Model Addition Rico has 3 How many . Then he gets 1 more does he have now? . Unlock the Problem What do I need to find? the number of Rico has now. What information do I need to use? crayons 3 1 He gets — . Rico has — . Show how to solve the problem. 3 3+1= 1 4 Read the problem. Use the bar model to solve. Complete the model and the number sentence. 1. There are 5 birds flying. Then 3 more birds join them. How many birds are flying now? 5 3 5+3= Reteach © Houghton Mifflin Harcourt Publishing Company R4 Grade 1 Lesson 1.5 Reteach Name Algebra • Add Zero Use to show each number. Add. Write the sum. 3 3+0=— 2 0+2=— When you add zero to a number, the sum is that number. to show each number. Use Draw the . Write the sum. 1. 2. 0+4= — 3. 6+0= — 0+5= — 4. 0+1= Reteach © Houghton Mifflin Harcourt Publishing Company — R5 Grade 1 Lesson 1.6 Reteach Name Algebra • Add in Any Order Write an addition sentence. Change the order of the addends. The sum is still the same. 3 +— 5 =— 8 sum 8 5+3=— sum Use the sum. to add. Write Turn the cube train around. — Change the order of the addends. Color to match. Write the addition sentence. 1. 1+5=— — +—=— 3+1=— — +—=— 2. Reteach © Houghton Mifflin Harcourt Publishing Company R6 Grade 1 Lesson 1.7 Reteach Name Algebra • Put Together Numbers to 10 You can use to model ways to make 7. 1 =7 6+— 2 =7 5+— Use . Draw to show how to make 7. Complete the addition sentences. 1. 4 +— = 7 2. 3 +— = 7 3. 2 +— = 7 4. 1 +— = 7 Reteach © Houghton Mifflin Harcourt Publishing Company R7 Grade 1 Lesson 1.8 Reteach Name Addition to 10 You can use to help you add. 4 + 2 6 + 3 6 Use . Write the sum. 1. 1 + 2 2. 4 + 1 3. 3 + 5 4. 2 + 3 Reteach © Houghton Mifflin Harcourt Publishing Company R8 Grade 1 Lesson 2.1 Reteach Name Use Pictures to Show Taking From Use the picture. 5 rabbits 3 hop away. 2 — rabbits now Write how many there are now. 1. 8 birds 4 fly away. — birds now 7 bees 2 fly away. — bees now 2. Reteach © Houghton Mifflin Harcourt Publishing Company R9 Grade 1 Lesson 2.2 Reteach Name Model Taking From Circle the part you take from the group. Then cross it out. 3 dogs 2 dogs run away. 3-2 1 — dog now 1 =— Circle the part you take from the group. Then cross it out. Write the difference. 1. 4 goats 2 goats walk away. — goats now 4 - 2 =— 2. 6 ants 3 ants walk away. — ants now 6 - 3 =— Reteach © Houghton Mifflin Harcourt Publishing Company R10 Grade 1 Lesson 2.3 Reteach Name Model Taking Apart You can use to subtract. Sam has 6 cars. 4 cars are red. The rest are yellow. How many cars are yellow? 2 cars are yellow. 6 2 4 5 2 to solve. Color. Write the number sentence Use and how many. 1. There are 5 books. 1 book is red. The rest are yellow. How many books are yellow? yellow books 2. There are 6 blocks. 3 blocks are small. The rest are big. How many blocks are big? big blocks Reteach © Houghton Mifflin Harcourt Publishing Company R11 Grade 1 Lesson 2.4 Reteach Name Problem Solving • Model Subtraction There were 9 bugs on a rock. 7 bugs ran away. How many bugs are on the rock now? What do I need to find? bugs how many What information do I need to use? 9 bugs on a rock 7 bugs ran away on the rock now Show how to solve the problem. 7 9-7= 2 2 9 Read the problem. Use the model to solve. Complete the model and the number sentence. 1. There are 5 birds. 1 bird is big. The rest are small. How many birds are small? 1 5 5-1= Reteach © Houghton Mifflin Harcourt Publishing Company R12 Grade 1 Lesson 2.5 Reteach Name Use Pictures and Subtraction to Compare You can subtract to compare groups. There is 1 more than there are . 1 7-6=— There is 1 fewer than there are . Subtract to compare. 1. 2. 5 - 3 =— — 6 - 4 =— more 3. — fewer 4. 4 - 1 =— — 7 - 3 =— more Reteach © Houghton Mifflin Harcourt Publishing Company — R13 fewer Grade 1 Lesson 2.6 Reteach Name Subtract to Compare You can use to show the bar model. 8 6 Andy has 8 balloons. Jill has 6 balloons. How many more balloons does Andy have than Jill? 8 6 2 8 more balloons - 6 = 2 Read the problem. Use the bar model to solve. Write the number sentence. Then write how many. 1. Bo has 6 rocks. Jen has 4 rocks. How many more rocks does Bo have than Jen? 6 4 6 4 — - more rocks Reteach © Houghton Mifflin Harcourt Publishing Company R14 = Grade 1 Lesson 2.7 Reteach Name Subtract All or Zero When you subtract zero from a number, the difference is the number. When you subtract a number from itself, the difference is zero. No All are crossed out. 0 4-4=— 4 4-0=— Use are crossed out. . Write the difference. 1. 2. 0 3-3=— 3. 5-0=— 4. 2-0=— 5. 1-1=— 6. 6-0=— Reteach © Houghton Mifflin Harcourt Publishing Company 4-4=— R15 Grade 1 Lesson 2.8 Reteach Name Algebra • Take Apart Numbers You can use to take apart 6. Circle the part you take away. Then cross it out. 1 6-5= — 2 6-4= — Use to take apart 6. Circle the part you take away. Then cross it out. Complete the subtraction sentence. 1. 6-3=— 2. 6-2=— 3. 6-1=— 4. 6-0=— Reteach © Houghton Mifflin Harcourt Publishing Company R16 Grade 1 Lesson 2.9 Reteach Name Subtraction from 10 or Less You can use subtract. to help you 6 3 3 _ -1 _ 3 B 2 B Write the subtraction problem. 2. 1. 7 -4 _ 5 -3 _ B 3. B 4. 8 -1 _ 4 -2 _ B Reteach © Houghton Mifflin Harcourt Publishing Company B R17 Grade 1 Lesson 3.1 Reteach Name Algebra • Add in Any Order You can change the order of the addends. The sum is the same. 2 B + 5 B _ 7 B 5 + 2 _ 7 B Add. Change the order of the addends. Add again. 1. 3 + 1 _ B 3. 8 + 3 _ B Reteach © Houghton Mifflin Harcourt Publishing Company B +B _ B 2. B +B _ B 4. 4 + 2 _ B 9 + 5 _ B R18 B +B _ B B +B _ B Grade 1 Lesson 3.2 Reteach Name Count On You can count on to find 4 + 3. Start with the greater addend. Then count on. Write the sum. 5 4 — 7 4 + 3 =— 6 — To add 3, count on 3. 7 — Circle the greater addend. Count on 1, 2, or 3. Write the missing numbers. 1. 1+6 6 2. 9 — 1+6=— 3. 4+2 4 4. 3+8 8 — — — 3 + 8 =— 4 + 2 =— © Houghton Mifflin Harcourt Publishing Company — 9 + 1 =— — — Reteach 9+1 R19 Grade 1 Lesson 3.3 Reteach Name Add Doubles The addends are the same in a doubles fact. 3 — 3 + — = 6 Count the . Write the missing numbers. 1. 2. — +—= 8 3. — + — = 10 — +— = 2 4. — +—=4 Reteach © Houghton Mifflin Harcourt Publishing Company R20 Grade 1 Lesson 3.4 Reteach Name Use Doubles to Add Use a doubles fact to solve 4 + 3. Break apart 4 into 1 + 3. 1 + 1 + So, 4 + 3 7. + 3 =— THINK 3 + 3 = 6. 1 more than 6 is 7. 3 = 7 6 Use to model. Break apart to make a doubles fact. Add. 1. 6+5 1 — + + So, 6 + 5 = —. 2. 8 + 7 — — — So, 8 + + — — — = — + — + — — = — + 7 = —. Reteach © Houghton Mifflin Harcourt Publishing Company R21 Grade 1 Lesson 3.5 Reteach Name Doubles Plus 1 and Doubles Minus 1 You can use doubles plus one facts and doubles minus one to add. Use doubles fact 3 + 3 = 6. doubles plus one 3 + 4 = doubles minus one 7 3 + 2 = — 5 — Use doubles plus one or doubles minus one to add. 1. 5 + 6 = — 5 + 4 = — 2 + 3 = — 2 + 1 = — 2. Reteach © Houghton Mifflin Harcourt Publishing Company R22 Grade 1 Lesson 3.6 Reteach Name Practice the Strategies You can use different addition strategies to find sums. Count On 6 7 — Doubles 8 — 6 3+3=— 8 6+2=— Doubles Plus 1 Doubles Minus 1 11 5+6=— 1. Count on 1. 7+1=— 4. Use doubles. 9 5+4=— 2. Count on 2. 3. Count on 3. 7+2=— 7+3=— 5. Use doubles 6. Use doubles plus 1. 6+6=— Reteach © Houghton Mifflin Harcourt Publishing Company 6+7=— R23 minus 1. 6+5=— Grade 1 Lesson 3.7 Reteach Name Add 10 and More You can use counters and a ten frame to add a number to 10. Find 10 + 4. 10 + 4 _ 10 14 4 Draw . Show the number that is added to 10. Write the sum. 1. 10 + 3 _ 10 3 2. 10 10 + 7 _ 7 Reteach © Houghton Mifflin Harcourt Publishing Company R24 Grade 1 Lesson 3.8 Reteach Name Make a 10 to Add Show 8 + 5 with counters and a ten frame. Use . Make a ten. Add. 10 + 3 _ 8 5 13 So, 8 13 . + 5 =— Draw to show the second addend. Make a ten. Add. 1. 8+6 8 10 + 4 _ 6 So, 8 + 6 = —. 2. 9+7 9 10 + 6 _ 7 So, 9 + 7 = —. Reteach © Houghton Mifflin Harcourt Publishing Company R25 Grade 1 Lesson 3.9 Reteach Name Use Make a 10 to Add What is 9 + 5? Make a 10 to add. Make a 10. Add. Use and a ten frame. Show the addends. 9 10 5 4 So, 9 Show the greater addend in the ten frame. Draw 14 . + 5 =— . Make a ten to add. 1. 8 + 5 8 10 5 3 10 + 3 _ So, 8 + 5 = —. 2. 7 + 4 7 10 4 1 10 + 1 _ So, 7 Reteach © Houghton Mifflin Harcourt Publishing Company R26 + 4 = —. Grade 1 Lesson 3.10 Reteach Name Algebra • Add 3 Numbers You can add numbers in any order. 3+4+ 1=8 3 + 4 + 1=8 7 + 1=8 3+ 4 + 3+ 5 1 = 8 = 8 Use circles to change which two addends you add first. Complete the addition sentences. 1. 2 + 1 + 8 =11 — 2. + 8 =11 7 + 2 + 3 =12 — Reteach © Houghton Mifflin Harcourt Publishing Company + 3 =12 R27 2+ 1 + 8 = 11 2+ = 11 — 7+ 2 + 3 = 12 7+ = 12 — Grade 1 Lesson 3.11 Reteach Name Algebra • Add 3 Numbers What strategies help you add 3 numbers? 4 4 + 6 _ 4 4 + 6 _ 14 14 4 + 6 make a 10. 4 + 4 = 8 is a doubles fact. 10 14 B+ 4 =B 8 + 6 =14 B B Choose a strategy. Circle two addends to add first. Write the sum. Then find the total sum. 1. 7 3 + 3 _ 4 3 + 3 _ 10 B 2. 2 2 + 8 _ B B 4. 5 5 +4 _ B 13 3. Reteach © Houghton Mifflin Harcourt Publishing Company R28 Grade 1 Lesson 3.12 Reteach Name Problem Solving • Use Addition Strategies Tory has 9 toys. Bob has 4 toys. Joy has 2 toys. How many toys do they have? Unlock the Problem What do I need to find? how many they have What information do I need to use? 9 4 toys. Bob has — 2 toys. Joy has — toys Tory has — toys. Show how to solve the problem. — + — + — = — — toys Draw a picture to solve. 1. Rick has 7 books. He gets 2 more books. He then gets 2 more books. How many books does Rick have now? Reteach © Houghton Mifflin Harcourt Publishing Company R29 — books Grade 1 Lesson 4.1 Reteach Name Count Back Count back to subtract. . Count back 3. Use 9 This shows counting back 3 from 9. 6 7 8 6 9 9235_ Use . Count back 1, 2, or 3. Write the difference. 1. 5215 — 2. 5 7225 —— 3. 7 6235 — — — Reteach © Houghton Mifflin Harcourt Publishing Company R30 6 Grade 1 Lesson 4.2 Reteach Name Think Addition to Subtract What is 7 2 4? Think 3 =7 4+— So 3 7-4=— Use Draw to model the number sentences. to show your work. 1. What is 11 2 2? Think So 2 + — = 11 11 - 2 = — 2. What is 10 2 6? Think 6 + — = 10 So 10 - 6 = — 3. What is 6 2 1? Think 1+—=6 So 6-1=— Reteach © Houghton Mifflin Harcourt Publishing Company R31 Grade 1 Lesson 4.3 Reteach Name Use Think Addition to Subtract Think of an addition fact to help you subtract. Think ? 6+— 5 = 11 11- 6 = — 5 11 - 6 = — Use an addition fact to help you subtract. 2. What is 10 2 6? 1. What is 9 2 4? Use 4 +— =9 Use 6 + — = 10 So 9-4=— So 10 - 6 = — 3. What is 12 2 5? 4. What is 8 2 5? Use 5 + — = 12 Use 5 + — =8 So 12 - 5 = — So 8 Reteach © Houghton Mifflin Harcourt Publishing Company R32 - 5=— Grade 1 Lesson 4.4 Reteach Name Use 10 to Subtract Find 14 – 9. Start with 9 cubes. Make a 10. Add cubes to make 14. Count what you added. 5 You added —. 5 So, 14 2 9 5 —. Use . Make a ten to subtract. Draw to show your work. 1. ? 12 2 8 5 — 2. 12 2 8 5 Reteach © Houghton Mifflin Harcourt Publishing Company ? 15 2 9 5 — 15 2 9 5 R33 Grade 1 Lesson 4.5 Reteach Name Break Apart to Subtract What is 14 2 5? Start with 14. Make a ten. 4 from 14. Take — 14 4 10 —2—5— Step 1 1 10 1 9 —2—5— Step 2 Then take — more. 9 So, 142 5 5 — Subtract. 1. What is 17 2 9? Step 1 Take 7 counters from 17. 17 275— Then take — counters from 10. — Step 2 2 — 5— So, 17 2 9 5 — Reteach © Houghton Mifflin Harcourt Publishing Company R34 Grade 1 Lesson 4.6 Reteach Name Problem Solving • Use Subtraction Strategies Lara has 15 crackers. She gives some of them away. She has 8 left. How many crackers does she give away? Unlock the Problem What do I need to find? how many What information do I need to use? 15 8 crackers left. Lara has — crackers Lara has — crackers. Lara gives away Show how to solve the problem. 7 Lara gives away — crackers. Act it out to solve. Draw to show your work. 1. Min has 13 marbles. She gives some away. She has 5 left. How many marbles does she give away? Min gives away — marbles. Reteach © Houghton Mifflin Harcourt Publishing Company R35 Grade 1 Lesson 5.1 Reteach Name 1SPCMFN4PMWJOH "EEPS Subtract There are 12 skunks in the woods. Some skunks walk away. There are 8 skunks still in the woods. How many skunks walk away? Unlock the Problem 8IBUEP*OFFEUP¾OE how many walk away skunks 8IBUJOGPSNBUJPOEP *OFFEUPVTF 12 8 — skunks still in the woods — skunks in the woods 4IPXIPXUPTPMWFUIFQSPCMFN 8 skunks still in the woods 8 4 12 — walk away .BLFBNPEFMUPTPMWF 6TF UPIFMQZPV There are 15 frogs on a log. Some frogs hop away. There are 7 frogs still on the log. How many frogs hop away? 7 15 — frogs hop away Reteach © Houghton Mifflin Harcourt Publishing Company R36 Grade 1 Lesson 5.2 Reteach Name Record Related Facts Use the numbers to write four related facts. 6 4 10 6 + 4 = 10 10 - 4 = 6 4 + 6 = 10 10 - 6 = 4 THINK Each number is in all four facts. Use the numbers to make related facts. 1. 6 + 8 = 14 6 8 14 = 14 8+ B 2. 2 7 9 3. B+7=9 7+2=9 B = 11 5+ 5 6 11 6 + 5 = 11 4. 3 9 12 3 + 9 = 12 + 3 = 12 B Reteach © Houghton Mifflin Harcourt Publishing Company R37 B-8=6 14 - 6 = B 9-B=2 B-2=7 B-6=5 11 - B = 6 B-9=3 12 - B = 9 Grade 1 Lesson 5.3 Reteach Name Identify Related Facts If you know an addition fact, you will also know the related subtraction fact. Both facts use 2, 4, and 6. They are related facts. + 4C = 6 C 2 — — — - 4C = 2 6C — — — Add and subtract the related facts. 1. 7+8=— 15 - 8 = — 2. 7+4=— 11 - 4 = — 3. 1+8=— 9-8=— Reteach © Houghton Mifflin Harcourt Publishing Company R38 Grade 1 Lesson 5.4 Reteach Name Use Addition to Check Subtraction You can use addition to check subtraction. You start with 8. Take apart to subtract. THINK Put the 5 and 3 back together. Add to check. You end with 8. 5 B 8 3 _ + 3 _ 5 B 8 B Use to help you. Subtract. Then add to check your answer. B 7 3 _ B Reteach © Houghton Mifflin Harcourt Publishing Company + 3 _ B R39 Grade 1 Lesson 5.5 Reteach Name Algebra • Unknown Numbers Add or subtract to find the unknown numbers. B 6 + 5 = 11 THINK I start with 6. I keep adding cubes until there are 11. The missing number is 5. A related fact is 11 - 6 = 5. B 11 - 6 = 5 Use to find the unknown numbers. Write the numbers. 1. 2. B = 13 13 - 4 = B B = 15 15 - 7 = B 4+ 3. 7+ 4. B = 14 14 - 8 = B 9 + B = 18 18 - 9 = B 8+ 5. Reteach © Houghton Mifflin Harcourt Publishing Company B = 16 16 - 9 = B 8 + B= 16 16 - 8 = B 9+ 6. R40 Grade 1 Lesson 5.6 Reteach Name Algebra • Use Related Facts Find 11 – 6. THINK Start with 6. How many do I add to make 11? Use counters to help you. 5 = 11 6+— 5 11 - 6 = — 11 5 6 Use counters. Write the missing numbers. 1. Find 13 - 8. 2. Find 12 - 3. 8 + — = 13 3+ 13 - 8 = — — 12 - 3 = — 13 12 8 Reteach © Houghton Mifflin Harcourt Publishing Company = 12 3 R41 Grade 1 Lesson 5.7 Reteach Name Choose an Operation Liz has 15 stuffed animals. She gives away 6. How many stuffed animals are left? THINK Liz gives some away. So, I subtract. Circle subtract. add 9 subtract 15 - 6 = 9 stuffed animals Circle add or subtract. Write a number sentence to solve. 1. Misha has 11 crackers. He eats 2 crackers. How many crackers are left? add subtract = crackers 2. Lynn has 5 shells. Dan has 7 shells. How many shells do Lynn and Dan have? add = shells Reteach © Houghton Mifflin Harcourt Publishing Company subtract R42 Grade 1 Lesson 5.8 Reteach Name Algebra • Ways to Make Numbers to 20 These are some ways to make the number 14. 4 + 4 + 6 = 14 7 + 7 = 14 14 - 0 = 14 Use to show each way. Cross out the way that does not make the number. 1. 7 8-1 3+4 2+3+1 15 7+6 15 - 0 8+7 4+4+5 9-4 6+7 9 8+2 3+3+3 10 - 1 18 9+9 9-9 18 - 0 2. 3. 13 4. 5. Reteach © Houghton Mifflin Harcourt Publishing Company R43 Grade 1 Lesson 5.9 Reteach Name Algebra • Equal and Not Equal An equal sign means both sides are the same. 3+3=6-0 3+2=5-2 THINK 3 + 3 = 6 and 6 - 0 = 6. Is 6 the same as 6? THINK 3 + 2 = 5 and 5 - 2 = 3. Is 5 the same as 3? — It is true. — It is false. yes no Which is true? Circle your answer. Which is false? Cross out your answer. 1. 7–5=5–2 2. 8–8=6–6 3. 4+3=5+2 2+8=8+2 4. 7+3=4+5 Reteach © Houghton Mifflin Harcourt Publishing Company 1 + 8 = 18 9–2=9+2 9 = 10 – 1 R44 Grade 1 Lesson 5.10 Reteach Name Facts Practice to 20 Mr. Chi has 12 books. He sells 3 books. How many books are left? What is 12 – 3? THINK I can use a related fact. THINK I can count back. Start at 12. 9. Count 11, 10, — 3 + 9 = 12 9 12 - 3 = — 9. So, 12 - 3 = — Add or subtract. 1. 14 - 5 = — 2. 9+2=— 3. 6+4=— 4. 12 - 6 = — 5. 8-3=— 6. 7+5=— 7. 9+6=— 8. 13 - 9 = — 9. 8 + 8 = — Reteach © Houghton Mifflin Harcourt Publishing Company R45 Grade 1 Lesson 6.1 Reteach Name Count by Ones to 120 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 Count forward. Write the numbers. 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 I find 108 on the chart. 109 comes next. 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101102 103104105106107108 109110 111112 113114115116117118 119120 108, 109 , 110 , 111 Use a Counting Chart. Count forward. Write the numbers. 112, 2. 25, 3. 95, 4. 50, 1. , , , , Reteach © Houghton Mifflin Harcourt Publishing Company , , , , R46 Grade 1 Lesson 6.2 Reteach Name Count by Tens to 120 Use the Counting Chart. Count forward by tens. Start on 4. 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 14, 24, 34, 44, 54, 41 42 43 44 45 46 47 48 49 50 64, 74, 84 , 94 , 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 104, 114 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 Use the Counting Chart to count by tens. Write the numbers. 1. Start on 5. 15, 25, 35, 45, , , , , 2. Start on 38. 48, 58, 68, , , , , , 3. Start on 26. 36, 46, Reteach © Houghton Mifflin Harcourt Publishing Company , , , R47 , , Grade 1 Lesson 6.3 Reteach Name Understand Ten and Ones You can use to show ten and some ones. You can write ten and ones in different ways. 1 2 10 2 —+— 12 — — ten — ones Use the model. Write the number three different ways. — ten — ones 1. —+— — — ten — ones 2. —+— — — ten — ones 3. —+— — Reteach © Houghton Mifflin Harcourt Publishing Company R48 Grade 1 Lesson 6.4 Reteach Name Make Ten and Ones You can make 1 ten with 10 . 12 twelve 1 12 2 — ones = — ten — ones 1 — 2 ten — ones Write how many tens and ones. 1. 2. 15 fourteen fifteen 1 5 — ten — ones 3. — ten — ones 4. 16 — ten — ones © Houghton Mifflin Harcourt Publishing Company 13 thirteen sixteen Reteach 14 — ten — ones R49 Grade 1 Lesson 6.5 Reteach Name Tens You can put ones together to make tens. Draw to show the 2 tens. 2 20 ones = 2 tens 20 — tens = — Use . Make groups of ten. Draw the tens. Write how many tens. Write the number. 1. 30 ones = 3 tens — tens = — 40 ones = 4 tens — tens = — 50 ones = 5 tens — tens = — 2. 3. Reteach © Houghton Mifflin Harcourt Publishing Company R50 Grade 1 Lesson 6.6 Reteach Name Tens and Ones to 50 You can use tens and ones to show a number. Tens Ones 4 tens 2 ones = There are 4 tens. There are 2 ones. This shows 42. 42 — Use your MathBoard and to show the tens and ones. Write the numbers. 1. 2. 1 ten 8 ones = 18 — 3. 2 tens 5 ones = — 3 tens 6 ones = — 4. 4 tens 7 ones = Reteach © Houghton Mifflin Harcourt Publishing Company — R51 Grade 1 Lesson 6.7 Reteach Name Tens and Ones to 100 If you know the tens and ones, you can write the number. Tens Ones There are 9 tens. There are 8 ones. The number is 98. 9 tens 98 8 ones = — Use your MathBoard and to show the tens and ones. Write the numbers. 1. 2. 59 5 tens 9 ones = — 6 tens 3 ones = — 3. 4. 7 tens 7 ones = — Reteach © Houghton Mifflin Harcourt Publishing Company 8 tens 2 ones = — R52 Grade 1 Lesson 6.8 Reteach Name Problem Solving • Show Numbers in Different Ways How can you show the number 34 two different ways? Unlock the Problem What do I need to find? What information do I need to use? to show a number The number is —. two different ways 34 Show how to solve the problem. First Way Tens THINK You can trade 1 ten for 10 ones. Second Way Ones Tens Ones 1. Use to show 26 two different ways. Draw both ways. Tens Reteach © Houghton Mifflin Harcourt Publishing Company Tens Ones R53 Ones Grade 1 Lesson 6.9 Reteach Name Model, Read, and Write Numbers from 100 to 110 What is 10 tens and 2 more? Count by tens. Then count by ones. 100, 101, 102 10 tens and 2 more = 102 10, 20, 30, 40, 50, 60, 70, 80, 90, Use to model the number. Write the number. 1. 10 tens and 3 more 2. 10 tens and 7 more — — 3. 10 tens and 6 more 4. 10 tens and 9 more — — Reteach © Houghton Mifflin Harcourt Publishing Company R54 Grade 1 Lesson 6.10 Reteach Name Model, Read, and Write Numbers from 110 to 120 What is the number? Count by tens. Then count by ones. 10 20 30 40 50 60 70 80 90 100 110 111 112 113 113 The number is —. Use to model the number. Write the number. 1. 2. — — 3. 4. — Reteach © Houghton Mifflin Harcourt Publishing Company — R55 Grade 1 Lesson 7.1 Reteach Name Algebra • Greater Than You can compare numbers to find which is greater. 48 65 24 62 48 65 24 — is greater than —. 62 — is greater than —. 65 > — 62 48 > — 24 — — Draw lines to match. Write the numbers to compare. 1. 2. 43 51 55 34 — is greater than —. — is greater than —. — >— —>— Reteach © Houghton Mifflin Harcourt Publishing Company R56 Grade 1 Lesson 7.2 Reteach Name Algebra • Less Than You can compare numbers to find which is less. 23 65 26 43 23 26 23 26 —<— 43 65 43 65 —<— — is less than —. — is less than —. Draw lines to match. Write the numbers to compare. 1. 2. 37 74 31 44 — is less than —. — is less than —. —<— —<— Reteach © Houghton Mifflin Harcourt Publishing Company R57 Grade 1 Lesson 7.3 Reteach Name Algebra • Use Symbols to Compare You can use symbols to compare numbers. C 15 < 18 18 = C 18 23 > C 18 This symbol means This symbol means This symbol means is less than. is equal to. is greater than. Write >, <, or =. Complete the sentence. 1. 2. < 57 C is less than 51 51 ——— 57. 29 C 48 C 29 3. 29 29. 4. 35 C 35 Reteach © Houghton Mifflin Harcourt Publishing Company 33 33. R58 48 55 55. Grade 1 Lesson 7.4 Reteach Name Problem Solving • Compare Numbers Anthony has the number cards 5 7 shown. He gives away the cards with numbers less than 6 and greater than 9. Which cards does Anthony have now? 8 10 11 Unlock the Problem What do I need to find? What information do I need to use? the ———— that Anthony has now number cards < — number cards 9 and > —. Show how to solve the problem. 5 7 8 10 6 THINK Cross out the numbers Anthony gives away. 11 7 8 Anthony has number cards — and —. Make a model to solve. 1. Emily has the number cards shown. She gives away the cards less than 19 and greater than 22. Which cards does she have now? 17 18 20 Reteach © Houghton Mifflin Harcourt Publishing Company 21 23 R59 Emily has — and —. Grade 1 Lesson 7.5 Reteach Name 10 More, 10 Less 24 is 10 less than 34. 24 44 is 10 more than 34. 44 34 Write the numbers that are 10 less and 10 more. 1. 35 2. 22 Reteach © Houghton Mifflin Harcourt Publishing Company R60 Grade 1 Lesson 8.1 Reteach Name Add and Subtract Within 20 You can use strategies to add or subtract. • count on • doubles • doubles plus one What is 5 + 6? • count back • related facts • doubles minus one What is 12 - 4? I can use doubles plus one. I can use a related fact. 5 + 5 = 10 8 + 4 = 12 11 . So, 5 + 6 = — 8. So, 12 - 4 = — Add or subtract. 1. 12 - 3 = 2. 8+9= 3. 10 - 5 = 4. 13 - 7 = 5. 7+8= 6. 6+6= Reteach © Houghton Mifflin Harcourt Publishing Company R61 Grade 1 Lesson 8.2 Reteach Name Add Tens What is 10 + 30? Use . Start with 1 ten. Add 3 more tens. Draw the tens. 4 40 10 + 30 = — 1 ten + 3 tens = — tens Use . Draw to show tens. Write how many tens. Write the sum. 1. 2. 1 ten + 8 tens = — tens 10 + 80 = 4 tens + 3 tens = 40 + 30 = — 3. — tens — 4. 2 tens + 6 tens = 20 + 60 = Reteach © Houghton Mifflin Harcourt Publishing Company — tens 5 tens + 3 tens = 50 + 30 = — R62 — tens — Grade 1 Lesson 8.3 Reteach Name Subtract Tens What is 60 – 40? Use . Show 6 tens. Take away 4 tens. 2 tens are left. 2 20 60 - 40 = — 6 tens - 4 tens = — tens Use . Draw to show tens. Write how many tens. Write the difference. 1. 2. 7 tens - 4 tens = 70 - 40 = — tens 9 tens - 5 tens = 90 - 50 = — 3. — tens — 4. 5 tens - 2 tens = 50 - 20 = Reteach © Houghton Mifflin Harcourt Publishing Company — tens 8 tens - 7 tens = 80 - 70 = — R63 — ten — Grade 1 Lesson 8.4 Reteach Name Use a Hundred Chart to Add You can count on to add on a hundred chart. 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 Start at 21. Move right to count on 3 ones. Count 22 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 , 23 , 21 + 3 = 51 52 53 54 55 56 57 58 59 60 24 24 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 Start at 68. Move down to count on 3 tens. Count 78 , 88 68 + 30 = , 98 98 Use the hundred chart to add. Count on by ones. 1. 46 + 2 = 2. 63 + 3 = 4. 23 + 40 = Count on by tens. 3. 52 + 30 = Reteach © Houghton Mifflin Harcourt Publishing Company R64 Grade 1 Lesson 8.5 Reteach Name Use Models to Add Add ones to a two-digit number. + 21 3 THINK Draw 2 tens and 4 ones. 24 = THINK Add tens to a two-digit number. 21 + = 30 51 Use . Draw to show how to add the ones or tens. Write the sum. 1. 15 + 2 = Reteach © Houghton Mifflin Harcourt Publishing Company 2. R65 15 + 20 = Grade 1 Lesson 8.6 Reteach Name Make Ten to Add What is 17 + 5? Step 1 Use . Show 17. Use Step 2 Make a ten. . Show 5. Step 3 Add. 22 20 + 2 = — 22 . So, 17 + 5 = — Draw to show how you make a ten. Find the sum. 1. What is 16 + 8? 20 + 4 = 24 So, 16 + 8 = __. Reteach © Houghton Mifflin Harcourt Publishing Company R66 Grade 1 Lesson 8.7 Reteach Name Use Place Value to Add You can use tens and ones to help you add. Tens Ones Show 25. Add 25 and 22. Show 22. How many tens? 2 tens + 2 tens = How many ones? 5 ones + 2 ones = 4 7 __ tens + __ ones 40 + __ 7 = __ 47 4 7 tens ones 25 + 22 _ __ 47 Use tens and ones to add. 1. Add 34 and 42. Tens Ones 3 tens + 4 tens = __ tens 4 ones + 2 ones = __ ones 34 + 42 _ __ tens + __ ones __ Reteach © Houghton Mifflin Harcourt Publishing Company + R67 __ = __ Grade 1 Lesson 8.8 Reteach Name Problem Solving • Addition Word Problems Morgan plants 17 seeds. Amy plants 8 seeds. How many seeds do they plant? Unlock the Problem What do I need to find? how many they plant seeds What information do I need to use? Morgan plants 8 17 seeds. — Amy plants — seeds. Show how to solve the problem. count on ones make a ten add tens and ones — seeds. Draw to solve. Circle your reasoning. count on tens 1. Edward buys 24 tomato plants. make a ten He buys15 pepper plants. add tens and ones How many plants does he buy? — plants Reteach © Houghton Mifflin Harcourt Publishing Company R68 Grade 1 Lesson 8.9 Reteach Name Related Addition and Subtraction You can count up and back by tens to add and subtract. 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 Start at 68. Move down to count up by 3 tens. Count 78 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 , 88 , 68 + 30 = 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 98 98 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 Start at 98. Move up to count back by 3 tens. Count 88 , 78 , 98 - 30 = 68 68 Use the hundred chart to add and subtract. Count up and back by tens. 1. 42 + 20 = 2. 62 - 20 = Reteach © Houghton Mifflin Harcourt Publishing Company 24 + 60 = 84 - 60 = R69 Grade 1 Lesson 8.10 Reteach Name Practice Addition and Subtraction You can use models to add and subtract. 18 13 + 5 = — 30 90 - 60 = — Add or subtract. 1. 33 + 6 = — 2. 10 + 10 = — 3. 15 - 8 = — 4. 6+7= — 5. 54 + 23 = — 6. 71 + 8 = — 7. 5+5= — 8. 8-8= — 9. 16 + 3 = — 11. 9-7= — 12. 30 - 10 = — 10. 55 + 12 = — Reteach © Houghton Mifflin Harcourt Publishing Company R70 Grade 1 Lesson 9.1 Reteach Name Order Length You can put objects in order by length. These pencils are in order from shortest to longest. These pencils are in order from longest to shortest. shortest longest longest shortest Draw three lines in order from shortest to longest. 1. shortest 2. 3. longest Draw three lines in order from longest to shortest. 4. longest 5. 6. shortest Reteach © Houghton Mifflin Harcourt Publishing Company R71 Grade 1 Lesson 9.2 Reteach Name Indirect Measurement Clue 1: A marker is shorter than a pencil. Clue 2: The pencil is shorter than a ribbon. Is the marker shorter or longer than the ribbon? marker Draw Clue 1. Draw Clue 2. Then compare the marker and the ribbon. pencil ribbon So, the marker is shorter than the ribbon. Use the clues. Write shorter or longer to complete the sentence. Then draw to prove your answer. 1. Clue 1: A string is longer than a straw. Draw Clue 1. Draw Clue 2. Then compare the string and the pencil. Clue 2: The straw is longer than a pencil. Is the string shorter or longer than the pencil? string straw pencil The string is Reteach © Houghton Mifflin Harcourt Publishing Company than the pencil. R72 Grade 1 Lesson 9.3 Reteach Name Use Nonstandard Units to Measure Length You can use to measure length. Line up the . Count how many. 5 about — Use real objects. Use Count how many. to measure. 1. about — 2. Glue about — 3. about — 4. about — Reteach © Houghton Mifflin Harcourt Publishing Company R73 Grade 1 Lesson 9.4 Reteach Name Make a Nonstandard Measuring Tool About how long is the ribbon? Count to measure. 10 Count on by ones. about Use real objects and the measuring tool you made. Measure. 1. about 2. about 3. Reteach © Houghton Mifflin Harcourt Publishing Company about R74 Grade 1 Lesson 9.5 Reteach Name Problem Solving • Measure and Compare The gray ribbon is 3 long. The white ribbon is 4 long. The black ribbon is 1 longer than the white ribbon. Draw and color the length of the ribbons in order from shortest to longest. What do I need to find? order the ribbons from shortest to What information do I need to use? longest Measure the ribbons using paper clips. Show how to solve the problem. shortest longest 1 2 3 1 2 3 4 1 2 3 4 5 about 3 about 4 about 5 1. The ribbon is the shortest ribbon. 2. The ribbon is the longest ribbon. Reteach © Houghton Mifflin Harcourt Publishing Company R75 Grade 1 Lesson 9.6 Reteach Name Time to the Hour Look at the hour hand. 8 The hour hand points to the It is 11 12 1 2 10 9 3 4 8 7 6 5 . 8:00 . Look at where the hour hand points. Write the time. 1. The hour hand points to the It is . . 2. The hour hand points to the It is 11 12 1 2 10 9 3 4 8 7 6 5 . 11 12 1 2 10 9 3 4 8 7 6 5 . 3. 4. 11 12 1 2 10 9 3 4 8 7 6 5 Reteach © Houghton Mifflin Harcourt Publishing Company 5. 11 12 1 2 10 9 3 4 8 7 6 5 R76 11 12 1 2 10 9 3 4 8 7 6 5 Grade 1 Lesson 9.7 Reteach Name Time to the Half Hour The hour hand points halfway between 10 the 9 It is half past 9:00 and the 11 12 1 2 10 9 3 4 8 7 6 5 . . Look at where the hour hand points. Write the time. 11 12 1 2 10 9 3 4 8 7 6 5 1. The hour hand points halfway between the and the . It is . 2. The hour hand points halfway between the and the . It is 3. . 4. 11 12 1 2 10 9 3 4 8 7 6 5 Reteach © Houghton Mifflin Harcourt Publishing Company 11 12 1 2 10 9 3 4 8 7 6 5 5. 11 12 1 2 10 9 3 4 8 7 6 5 R77 11 12 1 2 10 9 3 4 8 7 6 5 Grade 1 Lesson 9.8 Reteach Name Tell Time to the Hour and Half Hour The short hand is the hour hand. It shows the hour. The long hand is the minute hand. It shows the minutes after the hour. There are 60 minutes in one hour. 55 50 45 40 60 5 5 11 12 1 2 10 9 3 4 8 7 6 5 35 30 There are 30 minutes in a half hour. 10 11 12 1 2 10 9 3 4 8 7 6 5 10 15 20 30 25 15 20 25 8:30 8:00 Write the time. 1. 11 12 1 2 10 9 3 4 8 7 6 5 Reteach © Houghton Mifflin Harcourt Publishing Company 2. 11 12 1 2 10 9 3 4 8 7 6 5 R78 3. 11 12 1 2 10 9 3 4 8 7 6 5 Grade 1 Lesson 9.9 Reteach Name Practice Time to the Hour and Half Hour The hour hand points to 8. The minute hand points to 12. The hour hand points between 8 and 9. The minute hand points to 6. 11 12 1 2 10 9 3 4 8 5 7 6 11 12 1 2 10 9 3 4 8 7 6 5 8:00 8:30 Use the hour hand to write the time. Draw the minute hand. 1. 11 12 1 2 10 9 3 4 8 7 6 5 Reteach © Houghton Mifflin Harcourt Publishing Company 2. 11 12 1 2 10 9 3 4 8 7 6 5 R79 3. 11 12 1 2 10 9 3 4 8 7 6 5 Grade 1 Lesson 10.1 Reteach Name Read Picture Graphs A picture graph uses pictures to show how many. Count the in each row. Snack We Like apple pretzel Each stands for 1 child who chose that snack. There are There are 5 3 children who chose children who chose . . Use the picture graph to answer each question. What We Ate for Lunch sandwich soup S oup Each stands for 1 child. 1. Which lunch did more S oup children choose? Circle. 2. How many children chose 3. How many children chose Reteach © Houghton Mifflin Harcourt Publishing Company ? S oup ? R80 children children Grade 1 Lesson 10.2 Reteach Name Make Picture Graphs Are there more black cars or white cars? Complete the picture graph to find out. Cross out each car as you count. Draw a in the graph to show each car. Black and White Cars black white Each stands for 1 car. Use the picture graph to answer each question. 1. How many are there? 2. How many are there? 3. Are there more Reteach © Houghton Mifflin Harcourt Publishing Company or ? Circle. R81 Grade 1 Lesson 10.3 Reteach Name Read Bar Graphs A bar graph uses a bar to show how many. Kinds of Snacks This graph shows 6 children chose The longest bar shows the snack most children chose. . Our Favorite Snack apple pretzel yogurt 0 1 2 3 4 5 Number of Children 6 Use the bar graph to answer the question. 1. How many children chose ? 2. How many children chose children ? 3. Circle the snack the most 4. Circle the snack the children chose. Reteach © Houghton Mifflin Harcourt Publishing Company children fewest children chose. R82 Grade 1 Lesson 10.4 Reteach Name Make Bar Graphs Make a bar graph to show each animal in the picture. Kinds of Animals Cross out each animal as you show it in the graph. Animals at the Farm sheep chicks 0 1 2 3 4 5 6 Number of Animals Are there more or in your classroom? 1. Make a bar graph to find out. Desks and Doors in Our Classroom Items desks doors 0 2. How many 1 2 3 4 5 6 7 Number of Items 8 9 10 are in your classroom? 3. Are there more or in your classroom? Circle. Reteach © Houghton Mifflin Harcourt Publishing Company R83 Grade 1 Lesson 10.5 Reteach Name Read Tally Charts Some children named their favorite collections. Each stands for 1 child. Each stands for 5 children. Our Favorite Thing to Collect 4 shells 12 34 stamps 5 Total 67 More children like to collect stamps 7 . Complete the tally chart. Do you have a pet? Total yes no Use the tally chart to answer each question. 1. How many children have a pet? children 2. How many children do not have a pet? children 3. Did more children answer yes or no? Reteach © Houghton Mifflin Harcourt Publishing Company R84 Grade 1 Lesson 10.6 Reteach Name Make Tally Charts The picture shows shapes. Make a tally chart to show how many of each shape. Cross out each shape as you count. Shapes in the Picture Total 6 3 8 circles stars triangles Use the tally chart to answer each question. 1. How many are there? 2. How many more than are there? more 3. Which shape is there the most of? Circle. Reteach © Houghton Mifflin Harcourt Publishing Company R85 Grade 1 Lesson 10.7 Reteach Name Problem Solving • Represent Data Ava has these beads to make a bracelet. How can you find how many beads she has? Unlock the Problem What do I need to find? how many What information do I need to use? beads , the number of , Ava has in the picture and Show how to solve the problem. Beads Ava Has Color the first bar to show there are 4 circles. circle square triangle 0 1 2 3 4 5 6 Use the graph. Write how many. Add to solve. 4 1. 1 1 How many beads does Ava have? Reteach © Houghton Mifflin Harcourt Publishing Company R86 5 beads Grade 1 Lesson 11.1 Reteach Name Three-Dimensional Shapes curved surface sphere curved and flat surfaces cone cylinder flat surfaces rectangular prism cube Color to sort the shapes into three groups. 1. only flat surfaces 2. only a curved surface 3. both curved and flat surfaces cube cone sphere Reteach © Houghton Mifflin Harcourt Publishing Company cylinder rectangular prism R87 Grade 1 Lesson 11.2 Reteach Name Combine Three-Dimensional Shapes Put shapes together to make a new shape. and do not make this shape. Use three-dimensional shapes. Combine. Which new shapes can you make? Circle them. 1. 2. Reteach © Houghton Mifflin Harcourt Publishing Company R88 Grade 1 Lesson 11.3 Reteach Name Make New Three-Dimensional Shapes Build a shape. Copy the shape. Combine them. Circle a new shape you can make. You cannot make this new shape. The first shapes did not stay the same. Use three-dimensional shapes. Build these shapes. Circle the new shape you can make. Cross out the shape you cannot make. 1. 2. Reteach © Houghton Mifflin Harcourt Publishing Company R89 Grade 1 Lesson 11.4 Reteach Name Problem Solving • Take Apart Three-Dimensional Shapes Kate has , , , and She built a tower. Which shapes did Kate use to build the tower? . Unlock the Problem What do I need to find? shapes which Kate used to build the tower What information do I need to use? Kate has these shapes. Show how to solve the problem. Find the matching shapes. Use three-dimensional shapes. Circle your answer. 1. Which shapes did Marvin use to build this bench? Reteach © Houghton Mifflin Harcourt Publishing Company R90 Grade 1 Lesson 11.5 Reteach Name Two-Dimensional Shapes on Three-Dimensional Shapes circle rectangle square Look at the shape. Circle the flat surfaces it has. 1. 2. 3. Reteach © Houghton Mifflin Harcourt Publishing Company R91 Grade 1 Lesson 12.1 Reteach Name Sort Two-Dimensional Shapes Circles are curved Triangles have 3 sides and and closed. 3 vertices. Rectangles have 4 sides and 4 vertices. A square is a special kind of rectangle. Read the sorting rule. Circle the shapes that follow the rule. 1. 4 sides 2. curved and closed 3. 3 vertices Reteach © Houghton Mifflin Harcourt Publishing Company R92 Grade 1 Lesson 12.2 Reteach Name Describe Two-Dimensional Shapes This shape has 4 straight sides and 4 vertices. side vertex Write the number of straight sides or vertices. 1. triangle 2. square 3 sides 3. hexagon vertices 4. trapezoid vertices 5. triangle sides 6. square vertices Reteach © Houghton Mifflin Harcourt Publishing Company R93 sides Grade 1 Lesson 12.3 Reteach Name Combine Two-Dimensional Shapes You can put shapes together to make a new shape. 3 a make . Use pattern blocks. Draw to show the blocks. Write how many blocks you used. 1. How many make a make a 2. How many Reteach © Houghton Mifflin Harcourt Publishing Company . make a make a ? ? . R94 Grade 1 Lesson 12.4 Reteach Name Combine More Shapes Combine shapes to make a new shape. 2 Shapes Combine New Shape Circle the shapes that can combine to make the new shape. 1. 2. 3. Reteach © Houghton Mifflin Harcourt Publishing Company R95 Grade 1 Lesson 12.5 Reteach Name Problem Solving • Make New Two-Dimensional Shapes Luis wants to use to make a How many does he need? . Unlock the Problem What do I need to find? how Luis can make a What information do I need to use? using Luis uses Show how to solve the problem. 2 make a . Use shapes to solve. 1. Meg wants to use to make a . make a Reteach © Houghton Mifflin Harcourt Publishing Company . R96 Grade 1 Lesson 12.6 Reteach Name Find Shapes in Shapes Which two pattern blocks make this shape? Use two pattern blocks to make the shape. Circle the blocks you use. 1. 2. 3. 4. Reteach © Houghton Mifflin Harcourt Publishing Company R97 Grade 1 Lesson 12.7 Reteach Name Take Apart Two-Dimensional Shapes Use pattern blocks to help you find the parts of a shape. Use 2 of . Draw a line to show the parts. to find parts Use pattern blocks. Draw a line to show the parts. 2. Show 2 . 1. Show 2 . 3. Show 2 . Reteach © Houghton Mifflin Harcourt Publishing Company 4. Show 2 R98 . Grade 1 Lesson 12.8 Reteach Name Equal or Unequal Parts Equal Parts or The parts are Equal Shares the same size. Unequal Parts or Unequal Shares The parts are not the same size. Circle the shapes that show equal parts. Cross out the shapes that show unequal parts. 1. 2. 3. 4. Reteach © Houghton Mifflin Harcourt Publishing Company R99 Grade 1 Lesson 12.9 Reteach Name Halves How can you show halves? 1 2 whole 2 equal shares or halves Draw a line to show halves. Write the numbers. 1. whole halves whole halves 2. Reteach © Houghton Mifflin Harcourt Publishing Company R100 Grade 1 Lesson 12.10 Reteach Name Fourths How can you show fourths? 1 4 whole 4 There are 4 equal shares. fourths or quarters Draw lines to show fourths. Write the number. 1. whole fourths 2. Draw lines to show quarters. Write the number. whole Reteach © Houghton Mifflin Harcourt Publishing Company fourths R101 Grade 1 Lesson 1 Reteach Name Algebra • Ways to Expand Numbers You can write a number different ways. Count the tens. Count the ones. 4 5 — tens — ones 40 5. 5 ones is the same as — 40 5 45 — 1 — is the same as —. 4 tens is the same as —. Write how many tens and ones. Write the number two different ways. 1. 2. — tens — ones — tens — ones —1— —1— — — Reteach © Houghton Mifflin Harcourt Publishing Company GRR1 Grade 1 Lesson 2 Reteach Name Identify Place Value This shows the number 136. 1 3 6 136 has — hundred — tens — ones. Write the numbers in the table. 1 — Draw to show 136. Draw hundreds tens ones 3 — 6 — for Draw for Draw for Use your MathBoard and to show the number. Trace to draw the quick picture. Write how many hundreds, tens, and ones. 1. hundreds tens ones 128 Reteach © Houghton Mifflin Harcourt Publishing Company — GRR2 — — Grade 1 Lesson 3 Reteach Name Use Place Value to Compare Numbers You can use models and symbols to compare numbers. . means is greater than , means is less than 5 means is equal to Use the model to compare 142 and 147. Step 1 Compare the hundreds. 1 hundred Step 2 Compare the tens. 4 tens 5 4 tens Step 3 Compare the ones. 2 ones , 7 ones So, 142 is less than 147. 5 1 hundred 142 < 147 C if you need to. Use Write the numbers and compare. Write ,, ., or 5. 1. 168 C166 Compare the numbers using ., ,, or 5. You may wish to make a model to check. 2. 151 C151 Reteach © Houghton Mifflin Harcourt Publishing Company GRR3 Grade 1 Lesson 4 Reteach Name Algebra • Addition Function Tables Follow the rule to complete a function table. At the top of the table is a rule. The rule is Add 7 12 13 14 5 Add 7 —— . 6 Add 7 7 To complete the table, —— to each number on the left. Follow a rule to complete the table. 1. Add 2 2. Add 5 3. Add 8 7 4 4 8 6 5 9 8 6 Reteach © Houghton Mifflin Harcourt Publishing Company GRR4 Grade 1 Lesson 5 Reteach Name Algebra • Subtraction Function Tables Follow the rule to complete a function table. At the top of the table is a rule. The rule is Subtract 5 12 Subtract 5 ———. 13 Subtract 5 ——— To complete the table, from each number on the left. 14 7 8 9 Follow a rule to complete the table. 1. Subtract 3 2. Subtract 6 3. Subtract 4 5 9 7 7 11 9 9 13 11 Reteach © Houghton Mifflin Harcourt Publishing Company GRR5 Grade 1 Lesson 6 Reteach Name Algebra • Follow the Rule Read the rule at the top of each table. Circle the table that tells you to add. Underline the table that tells you to subtract. Then complete both tables. Add 1 3 5 7 9 Subtract 1 4 6 8 10 3 5 7 9 2 4 6 8 Follow a rule to complete the table. 1. Add 3 2. Subtract 3 10 10 9 9 8 8 7 7 Reteach © Houghton Mifflin Harcourt Publishing Company GRR6 Grade 1 Lesson 7 Reteach Name Add 3 Numbers Using a strategy can help you add 2 numbers. Start with 2 numbers that make a 10. Start with 2 numbers that will help you to make doubles. Start with 2 numbers to count on. 2 6 18 2 6 18 2 6 18 1 1 1 Start with 2 numbers. Trace the lines. Circle the strategy you use. Write the numbers. Find the sum. 1. 7 4 13 make a 10 1 2. doubles 1 5 16 make a 10 1 count on 3. 7 5 11 make a 10 1 count on 4. doubles count on Reteach © Houghton Mifflin Harcourt Publishing Company doubles 5 4 16 1 make a 10 doubles count on RGRR7 Grade 1 Lesson 8 Reteach Name Add a One-Digit Number to a Two-Digit Number Add to find how many tens and ones in all. Write the sum. Tens Ones There are 4 tens. There are 5 ones. The sum is 45. 43 1 2 45 Add. Write the sum. 1. 32 1 4 Tens Ones 2. 12 Tens Ones 1 7 3. 53 1 5 Tens Ones 4. 47 1 2 Tens 5. 68 1 1 Tens Ones 6. 95 1 3 Tens Reteach © Houghton Mifflin Harcourt Publishing Company GRR8 Ones Ones Grade 1 Lesson 9 Reteach Name Add Two-Digit Numbers Add to find how many tens and ones in all. Write the sum. Tens 22 1 13 Ones There are 3 tens. There are 5 ones. The sum is 35. 35 Add. Write the sum. 1. 31 1 24 3. 63 1 25 5. 81 1 17 Tens Tens Tens Reteach © Houghton Mifflin Harcourt Publishing Company Ones 2. 65 1 14 Tens Ones Ones 4. 42 1 34 Tens Ones Ones 6. 23 1 33 Tens Ones GRR9 Grade 1 Lesson 10 Reteach Name Repeated Addition Equal groups have the same number of items in each group. You can add equal groups to find how many in all. 5 There are — equal groups of fish. 2 Each group has — fish. Add to find how many fish in all. You can use 2 — to make a model. 2 1— 2 1— 2 1— 2 5 10 1— — 10 There are — fish in all. Use your MathBoard and . Make equal groups. Complete the addition sentence. Number Number of Equal in Each Groups Group How many in all? 1. 3 5 —1—1—5— 2. 4 2 —1—1—1—5— Reteach © Houghton Mifflin Harcourt Publishing Company GRR10 Grade 1 Lesson 11 Reteach Name Use Repeated Addition to Solve Problems Loren has 3 jars. She wants to put 5 flowers in each jar. How many flowers does Loren need? Draw a picture to show the story. 3 5 flowers in each jar. Step 2 Draw — Step 3 Find how many in all. 5 5 5 15 —1—1—5— 15 flowers. Loren needs — Step 1 Draw — jars. Draw pictures to show the story. Write the addition sentence to solve. 1. Matt plays with 2 friends. He wants to give each friend 4 cars. How many cars does Matt need? — cars — 1—5— — 1—1— 2. Liz shops with 3 friends. She wants to buy each friend 3 hair clips. How many hair clips does Liz need? — hair clips Reteach © Houghton Mifflin Harcourt Publishing Company 5— GRR11 Grade 1 Lesson 12 Reteach Name Choose a Non-Standard Unit to Measure Length You can choose a nonstandard unit to measure the length of real objects. is short. Use it to measure short objects. A is longer. Use it to measure long objects. A Circle the unit you would use. to measure . Use Use to measure . Use real objects. Circle the unit you would use to measure. Then measure. Object Unit Measurement 1. about 2. about 3. about Reteach © Houghton Mifflin Harcourt Publishing Company GRR12 Grade 1 Lesson 13 Reteach Name Use a Non-Standard Ruler Use the to measure the marker. 7 7 The marker is about — How many long. long is the string? 1. about — long about — long 2. Reteach © Houghton Mifflin Harcourt Publishing Company GRR13 Grade 1 Lesson 14 Reteach Name Compare Lengths The black ribbon is The gray ribbon is Use shortest . longest . to measure each ribbon. 8 10 about — 6 about — long about — long about — long about — long about — long long Color the shortest ribbon blue. Color the longest ribbon yellow. Then measure with . Write the lengths. 1. Reteach © Houghton Mifflin Harcourt Publishing Company GRR14 Grade 1 Lesson 15 Reteach Name Time to the Hour and Half Hour Time to the Hour Time to the Half Hour minute hand points to 12 11 12 1 2 10 9 3 4 8 7 6 5 hour hand points to the hour number 11 12 1 2 10 9 3 4 8 7 6 5 hour hand points halfway between the hour number minute hand and the next points to 6 number 3:30 3:00 Read the clock. Write the time. 1. 11 12 1 2 10 9 3 4 8 7 6 5 2. — 3. 11 12 1 2 10 9 3 4 8 7 6 5 — 4. — Reteach © Houghton Mifflin Harcourt Publishing Company 11 12 1 2 10 9 3 4 8 7 6 5 11 12 1 2 10 9 3 4 8 7 6 5 — GRR15 Grade 1 Lesson 16 Reteach Name Use a Picture Graph Grapes We Like green grapes purple grapes Each stands for 1 child. How many children chose ? Count the Which grapes did fewer children chose? in the THINK Which row has fewer row. purple 5 — children ? grapes Our Shirt Colors red yellow blue Each stands for 1 child. Use the picture graph to answer the questions. 1. How many children are 2. How many children are there in all? wearing ? — children — children 3. What color shirts are most 4. How many more children of the children wearing? are wearing © Houghton Mifflin Harcourt Publishing Company ? — children — Reteach than GRR16 Grade 1 Lesson 17 Reteach Name Use a Bar Graph Kind of Animal Animals Seen at the Pond turtle salamander frog 0 How many the pond? 1 3 4 5 Number of Animals were seen at 6 Which animal was seen the least? Read the number below the end of the 2 THINK Which bar is the shortest? bar. 6 — turtles Use the bar graph to answer the questions. 2. How many were seen at the pond? 1. How many animals in all were seen at the pond? — animals 3. How many fewer were seen? than © Houghton Mifflin Harcourt Publishing Company 4. Were more more seen? or more — fewer Reteach — GRR17 Grade 1 Lesson 18 Reteach Name Take a Survey When you take a survey, you collect information. Tally marks help you keep track of the information you collect. Chris took a survey of his friends’ favorite lunch. The tally chart shows their answers. Our Favorite Lunch 3 — children chose sandwich. 6 — children chose pizza. 1 — child chose salad. pizza The most children chose Lunch Tally sandwich pizza salad ———. 1. Take a survey. Our Favorite Lunch Ask 10 classmates which lunch is their favorite. Use tally marks to show their answers. Lunch sandwich pizza salad 2. Did more children choose pizza or taco taco? 3. The most children chose Reteach © Houghton Mifflin Harcourt Publishing Company Tally . GRR18 Grade 1 Lesson 19 Reteach Name Identify Shapes vertex side vertex hexagon triangle 3 sides, 3 vertices side side vertex square rectangle 6 sides, 6 vertices trapezoid 4 sides, 4 vertices Circle to answer the question. Write to name the shape. 1. Which shape has 2. Which shape has 3. Which shape has 4 sides? 4. Which shape has 6 sides? 4 vertices? Reteach © Houghton Mifflin Harcourt Publishing Company 3 vertices? GRR19 Grade 1 Lesson 20 Reteach Name Equal Shares 2 4 — equal shares — equal shares half of the circle a fourth of the circle halves fourths Write to name the equal shares. 1. 2. fourths — 3. — 4. — Reteach © Houghton Mifflin Harcourt Publishing Company — GRR20 Grade 1