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```3
Chapter
Dear Family,
My class started Chapter 3 this week. In this chapter,
I will learn about addition strategies such as counting
on, adding doubles, and adding in any order.
Love,
Vocabulary
Home Activity
doubles Two equal groups make a
Have your child ﬁnd objects that show
doubles facts. For example, he or she
may ﬁnd a pair of shoes to show 1 + 1,
a carton of eggs to show 6 + 6, or
a six-pack of juice cans to show 3 +
3. Ask your child to say those doubles
facts.
doubles fact.
2+2=4
doubles plus one 2 + 2 = 4, so 2 + 3
Add another item to one of the groups,
and have your child name the doubles
plus one fact.
© Houghton Mifflin Harcourt Publishing Company
is 1 more, or 5.
2+3=5
Literature
Look for these books
in a library. Point out
examples of doubles and
counting on facts in the
pictures.
Chapter 3
12 Ways to
Get to 11
by Eve Merriam.
Two of Everything:
A Chinese Folktale
by Lily Toy Hong.
Albert Whitman and
Company, 1993.
thirty-nine
P39
3
Capítulo
Querida familia:
Mi clase comenzó el Capítulo 3 esta semana. En este capítulo,
aprenderé estrategias de suma como contar hacia adelante,
sumar dobles y sumar en cualquier orden.
Con cariño,
Vocabulario
Actividad para la casa
dobles Dos grupos iguales forman una
Pida a su hijo que encuentre objetos que
muestren operaciones de dobles. Por
ejemplo, puede hallar un par de zapatos
para mostrar 1 + 1, una caja de huevos
para mostrar 6 + 6 o una caja de 6 latas
de jugo para mostrar 3 + 3. Pídale a su
hijo que le diga cuáles son las operaciones
de dobles.
operación de dobles.
2+2=4
dobles más uno 2 + 2 = 4, por lo tanto
2 + 3 es 1 más o 5.
2+3=5
Literatura
Busque estos libros en una
biblioteca. Señale ejemplos de
operaciones de dobles y de
contar uno hacia delante en
las imágenes.
P40
forty
12 Ways to
Get to 11
Two of Everything:
A Chinese Folktale
por Eve Merriam. por Lily Toy Hong.
Albert Whitman and
Company, 1993.
© Houghton Mifflin Harcourt Publishing Company
Agregue otro artículo a uno de los grupos
y pida a su hijo que nombre la operación
de dobles más uno.
Lesson 3.1
Name
Algebra • Add in Any Order
COMMON CORE STANDARD—1.OA.3
Understand and apply properties of operations
and the relationship between addition and
subtraction.
Add. Change the order of
1.
7
+
3
]
10
4.
6
+
5
]
11
3
B
7
+B
10
B
2.
6
+
3
]
9
_
5
B
6
+B
11
B
5.
_
8
+
1
]
9
3
B
6
+B
9
B
3.
9
+
8
]
17
_
1
B
8
+B
9
B
_
6.
4
+
7
]
11
8
B
9
+B
17
B
_
7
B
4
+B
11
B
_
© Houghton Mifflin Harcourt Publishing Company
Problem
Problem Solving
Solving
Write two addition sentences you
can use to solve the problem.
7. Camila has 5 pennies.
Then she finds 4 more pennies.
How many pennies does
she have now?
Chapter 3
Order may vary.
5 1—
9
4 5—
5
9
4
—1—5—
—
forty-one
P41
Lesson Check (1.OA.3)
1. What is another way to write 7 + 6 = 13?
13
6+7=—
2. What is another way to write 6 + 8 = 14?
14
8+6=—
Spiral Review (1.OA.1, 1.OA.6)
3. What is the sum?
Write the number.
4. How many nests are there?
Write the number.
2 nests
P42
forty-two
and
1 more nest
3 nests
—
© Houghton Mifflin Harcourt Publishing Company
4
+
3
_
7
Lesson 3.2
Name
Count On
COMMON CORE STANDARD—1.OA.5
Add and subtract within 20.
Circle the greater addend.
Count on to ﬁnd the sum.
1.
8
+
2
]
10
2.
1
+
7
]
8
3.
3
+
9
]
12
4.
5
+
3
]
8
5.
7
+
3
]
10
6.
3
+
4
]
7
7.
6
+
2
]
8
8.
1
+
8
]
9
© Houghton Mifflin Harcourt Publishing Company
Problem
Problem Solving
Solving
Possible drawing is shown. Order
of the addends may vary.
Draw to solve.
Write the addition sentence.
9. Jon eats 6 crackers.
Then he eats 3 more crackers.
How many crackers does he eat?
6
7
8
9
6
3
9
— + — = — crackers
Chapter 3
forty-three
P43
Lesson Check (1.OA.5)
1. Count on to solve 5 + 2.
Write the sum.
7
—
2. Count on to solve 1 + 9.
Write the sum.
10
—
Spiral Review (1.OA.1)
3. What does the model show?
6
3
3
—+—=—
4. 4 ducks swim in the pond.
4
Complete the model and the number sentence.
6
4+2=—
P44
forty-four
2
6
© Houghton Mifflin Harcourt Publishing Company
2 more ducks join them.
How many ducks are in
the pond now?
HANDS ON
Name
Lesson 3.3
COMMON CORE STANDARD—1.OA.6
Add and subtract within 20.
Use
. Draw
Write the sum.
to show your work.
1.
4
+
4
]
8
2.
6
+
6
]
12
3.
3
+
3
]
6
4.
8
+
8
]
16
5.
5
+
5
]
10
6.
7
+
7
]
14
© Houghton Mifflin Harcourt Publishing Company
Problem
Problem Solving
Solving
Write a doubles fact to solve.
7. There are 16 crayons in the box.
Some are green and some are red.
The number of green crayons is the
same as the number of red crayons.
8
16
8
—=—+—
Chapter 3
forty-ﬁve
P45
Lesson Check (1.OA.6)
1. Write a doubles fact with the sum of 18.
9  +
9  = 18
​
​ —
—
​
​
2. Write a doubles fact with the sum of 12.

6  + ​ —
6   = 12
​
—
​
​
Spiral Review (1.OA.1, 1.OA.3)
3. What is the sum of 3 and 2? Check children’s drawing. Drawing
. Write the sum.
Draw the
should show 3 cubes and 2 cubes.

3  +​  —
2   =​
5
​
—
—
​
​
​
Write the sum.

4
4 + 0 =​
—

P46 forty-six
​
© Houghton Mifflin Harcourt Publishing Company
4. Draw circles to show the numbers.
HANDS ON
Name
Lesson 3.4
Use Doubles to Add
COMMON CORE STANDARD—1.OA.6
Add and subtract within 20.
. Make doubles. Add.
Use
1.
2.
5 +6
5 1—
5 1—
1
9+8
—
11 .
So, 5 + 6 = —
8 1—
8
1 1—
17 .
So, 9 + 8 = —
—
© Houghton Mifflin Harcourt Publishing Company
3.
15
8+7=—
4.
11
6+5=—
5.
13
7+6=—
6.
9
4+5=—
7.
15
7+8=—
8.
17
8+9=—
Problem
Problem Solving
Solving
Solve. Draw or write to explain.
9. Bo has 6 toys. Mia has 7 toys.
How many toys do they have?
13
— toys
Chapter 3
forty-seven
P47
Lesson Check (1.OA.6)
1. Use doubles to find the sum of 7 + 8.
Write the number sentence.
15 ​
7  ​+ ​
1  ​=

​ —
​  7  ​+ ​
—
—
—
Spiral Review (1.OA.1)
2. Circle the part you take from the group.
Cross it out. Then write the difference.
2
8 − 6 = ​ —

​
3. There are 7 gray kittens.
5
7  − ​
2  = ​
​
—
—
—
​
P48 forty-eight
​
​
7
2
5
© Houghton Mifflin Harcourt Publishing Company
2 kittens are black. How many
fewer black kittens are there
than gray kittens?
Use the bar model to solve.
Then write the number sentence.
HANDS ON
Name
Doubles Plus 1 and Doubles Minus 1
Lesson 3.5
COMMON CORE STANDARD—1.OA.6
Add and subtract within 20.
Add. Write the doubles fact you
Doubles fact used will vary.
used to solve the problem.
1.
15
7+8=—
—
3.
—
C C
—
—
C C
—
C C
—
—
—
—
C C
—
—
5
3+2=—
—
8.
C C
3
2+1=—
—
6.
—
13
6+7=—
—
4.
11
5+6=—
—
© Houghton Mifflin Harcourt Publishing Company
—
17
8+9=—
—
7.
C C
7
4+3=—
—
5.
2.
C C
—
—
9
5+4=—
—
C C
—
—
Problem
Problem Solving
Solving
9. Andy writes an addition fact.
One addend is 9. The sum is
17. What is the other addend?
Write the addition fact.
8
9
—+ — =
Chapter 3
17
or 9 + 8 = 17
forty-nine
P49
Lesson Check (1.OA.6)
1. Use the picture. Write a doubles plus
one number sentence.
2 +—
2 +—
1
—
2. Which doubles fact helps you solve
Doubles fact used will vary.
8 + 7 = 15? Write the number sentence.
7 +—
1
7 +—
—
Spiral Review (1.OA.1)
3. There are 7 large dogs and 2 small dogs.
7 +
9
— dogs
—
2 =
—
9
—
4. What is the sum of 2 and 1 more?
Draw the
3
—
P50
ﬁfty
. Write the sum.
Check children’s drawings. Drawing
should show 2 cubes and 1 cube.
2+1=
3
—
© Houghton Mifflin Harcourt Publishing Company
How many dogs are there?
Use
to solve. Draw to show your work.
Write the number sentence and how many.
Lesson 3.6
Name
Practice the Strategies
COMMON CORE STANDARD—1.OA.6
Add and subtract within 20.
Add. Color doubles facts
Color count on facts
Color doubles plus one or
doubles minus one facts
.
.
.
1.
16
8+8=—
red
2.
9
8+1=—
blue
3.
8
1+7=—
blue
4.
11
8+3=—
blue
5.
10
5+5=—
red
6.
15
8+7=—
yellow
7.
17
8+9=—
yellow
8.
9
6+3=—
blue
9.
12
6+6=—
red
10.
7
2+5=—
blue
11.
13
7+6=—
yellow
12.
9
5+4=—
yellow
© Houghton Mifflin Harcourt Publishing Company
Problem
Problem Solving
Solving
Make a counting on problem.
Write the missing numbers.
7 apples are in a bag. should be 1, 2, or 3.
13. —
3
— more apples are put in the bag.
How many apples are in the bag now?
Chapter 3
10
— apples
ﬁfty-one
P51
Lesson Check (1.OA.6)
1. Which strategy would you use
to find 2 + 8? Explain how you decided.
Count on. Possible explanation: When I add 2 to 8, ———————
I can count on, 9, 10.
———————
2. What is the sum of 9 + 9?
Write the number.
—

​ 18
​
Spiral Review (1.OA.1, 1.OA.3)
3. What is the sum of 5 + 2 or 2 + 5?
Why is the sum the same?
7; Possible explanation: The addends are the same. ———————
Only the order is different.
———————
4. How many flowers are there?
Write the number.

6  ​ flowers
3 flowers and 3 more flowers ​ —
P52 fifty-two
© Houghton Mifflin Harcourt Publishing Company
HANDS ON
Name
Lesson 3.7
Add 10 and More
COMMON CORE STANDARD—1.OA.6
Add and subtract within 20.
Draw red
to show 10. Draw
yellow
to show the other addend.
Write the sum.
1.
3.
10
+ 7
_
17
10
+
9
_
19
2.
R
R
R
R
R
R
R
R
R
R
Y
Y
Y
Y
Y
Y
Y
4.
R
R
R
R
R
R
R
R
R
R
Y
Y
Y
Y
Y
Y
Y
Y
Y
10
+
5
_
15
10
+
4
_
14
R
R
R
R
R
R
R
R
R
R
Y
Y
Y
Y
Y
R
R
R
R
R
R
R
R
R
R
Y
Y
Y
Y
© Houghton Mifflin Harcourt Publishing Company
Problem
Problem Solving
Solving
Draw red and yellow
to solve.
Write the addition sentence.
5. Linda has 10 toy cars.
She gets 6 more cars.
How many toy cars
does she have now?
R
R
R
R
R
R
R
R
R
R
Y
Y
Y
Y
Y
Y
6
16
10
— + — = — toy cars
Chapter 3
ﬁfty-three
P53
Lesson Check (1.OA.6)
1. Draw more
to show the addition fact.
Then solve.

​  10
​
1
3
_
13
2. What number sentence does this model show?
Write the number sentence.

18 ​
​  10 ​
+ —
=
​  8  ​
​  —
—
Spiral Review (1.OA.1)
3. Show three different ways to make 10.
Write the number sentences.
Possible answers: 5 ∙ 5, 4 ∙ 6, 3 ∙ 7, 2 ∙ 8, 1 ∙ 9, 0 ∙ 10, 10 ∙ 0,
9 ∙ 1, 8 ∙ 2, 7 ∙ 3, 6 ∙ 4. Check children’s answers.
​
​
​
​
​
​
4. There are 3 large turtles and 1 small turtle.
How many turtles are there? Write the number sentence and how many.
4   turtles
​
—
​
P54 fifty-four

© Houghton Mifflin Harcourt Publishing Company
+ ​
10 = ​—
+ ​
10 = ​—
+ ​

10 = ​—

—

—

—

4  ​
​  3  ​
+
=
​  1  ​
​  —
—
—
HANDS ON
Name
Lesson 3.8
Make a 10 to Add
and a ten frame.
Use red and yellow
Show both addends. Draw to make
a ten. Then write the new fact.
1.
5
+
7
_
+
10
B
B2
12
B
10
B
B4
14
B
10
B
B1
11
B
_
2.
9
+
5
_
+
_
3.
8
+
3
_
+
© Houghton Mifflin Harcourt Publishing Company
_
COMMON CORE STANDARD—1.OA.6
Add and subtract within 20.
R
R
R
R
R
R
R
Y
Y
Y
Y
Y
R
R
R
R
R
R
R
R
R
Y
Y
Y
Y
Y
R
R
R
R
R
R
R
R
Y
Y
Y
Problem
Problem Solving
Solving
Solve.
9 .
4. 10 + 6 has the same sum as 7 + —
Chapter 3
ﬁfty-ﬁve
P55
Lesson Check (1.OA.6)
1. What sum does this model show?
Write the number.
10 ​
​
​ ​B

5 ​
B
15 ​
​B

+​

_

2. What addition sentence does this
​  ​B
4 ​
B
14 ​
​B
model show? Write the number sentence.
10
​

​

+​

_

Spiral Review (1.OA.1, 1.OA.6)
3. What is the sum of 4 + 6? Write the sum.
​
10
—
4. There are 2 big flowers and 4 small flowers.
How many flowers are there?
Write the number sentence and how many.
6   flowers
​
—
​
P56 fifty-six

6 ​
+
=

​  2  ​
​  4  ​
​ —
—
—
© Houghton Mifflin Harcourt Publishing Company
​
Lesson 3.9
Name
Use Make a 10 to Add
COMMON CORE STANDARD—1.OA.6
Add and subtract within 20.
Write to show how you make a ten.
1. What is 9
+ 7?
2. What is 5
6
9 1—
1 1—
—
6 5—
16
10 1 —
—
—
—
16 .
So, 9 + 7 = —
+ 8?
8 1—
3
2 1—
10 1 —
3 5—
13
13 .
So, 5 + 8 = —
Problem
Problem Solving
Solving
Use the clues to solve.
Draw lines to match.
© Houghton Mifflin Harcourt Publishing Company
3. Ann and Gia are eating grapes.
Ann eats 10 green grapes and
6 red grapes. Gia eats the same
number of grapes as Ann. Match
each person to her grapes.
Ann
7 green grapes and 9 red grapes
Gia
10 green grapes and 6 red grapes
Chapter 3
ﬁfty-seven
P57
Lesson Check (1.OA.6)
1. Write the number sentence.
Make a ten to find 8 + 4.
Write the number sentence.
8
2
2
—+ —+ —=
12
Spiral Review (1.OA.6, 1.OA.8)
2. What is the difference?
Complete the subtraction sentence.
5
−
5
]
0
3. What is the difference?
8
2
2
_
6
P58
ﬁfty-eight
© Houghton Mifflin Harcourt Publishing Company
Write the difference.
HANDS ON
Name
Lesson 3.10
Algebra • Add 3 Numbers
Look at the
. Complete the
addition sentences showing two ways
to ﬁnd the sum.
1.
11
5+4+2=—
6 =—
5 +—
11
—
2.
COMMON CORE STANDARD—1.OA.3
Understand and apply properties of operations
and the relationship between addition and
subtraction.
9 +—
2 =—
11
—
10
2+2+6=—
6 =—
10
4 +—
—
10
8 =—
2 +—
—
© Houghton Mifflin Harcourt Publishing Company
Problem
Problem Solving
Solving
3. Choose three numbers from 1 to 6.
Write the numbers in an addition sentence.
Show two ways to find the sum.
3, 4, 6; 3 + 4 + 6 = 13;
7 + 6 = 13; 3 + 10 = 13.
Chapter 3
ﬁfty-nine
P59
Lesson Check (1.OA.3)
1. What is the sum of 3 + 4 + 2?
Write the sum.
9
—
2. What is the sum of 5 + 1 + 4?
Write the sum.
10
—
Spiral Review (1.OA.1, 1.OA.6)
3. What is the sum of 3 and 7?
4. 4 cows are in the barn. 2 more cows
4
join them. How many cows are in the
barn now?
6
Complete the model and the number sentence.
6
— cows
P60
sixty
6
4+2=—
2
© Houghton Mifflin Harcourt Publishing Company
3
+
7
_
10
Lesson 3.11
Name
Algebra • Add 3 Numbers
COMMON CORE STANDARD—1.OA.3
Understand and apply properties of operations
and the relationship between addition and
subtraction.
Choose a strategy.
Write the sum. Circled addends may vary.
2.
1.
3.
2
2
+
6
_
10
7
3
+
3
_
13
6.
5.
1
2
+
9
_
12
4.
6
6
+
3
_
15
7.
6
4
+
3
_
13
2
0
+
8
_
10
8.
3
3
+
5
_
11
4
4
+
8
_
16
© Houghton Mifflin Harcourt Publishing Company
Problem
Problem Solving
Solving
Draw a picture. Write the number sentence.
9. Don has 4 black dogs.
Possible drawings
shown. Order of
Tim has 3 small dogs.
Sue has 3 big dogs.
How many dogs do they have?
10
3
3
4
— + — + — = — dogs
Chapter 3
sixty-one
P61
Lesson Check (1.OA.3)
1. What is the sum of 4 + 4 + 2?
​
10
—
​
2. Circle two addends to add first.
Find the sum. Explain your strategy.
7
​

​  3
+ 2 _
12
Strategies
and circled addends will
________
vary.
________
Spiral Review (1.OA.6)
3. Write a doubles plus one fact for the sum of 7.

7  ​
​  3  ​
+
=
​  4  ​
​  —
—
—
4. What addition sentence does this model show?

11 ​
+
​  3  ​
=
​  —
​  8  ​
—
—
P62 sixty-two
© Houghton Mifflin Harcourt Publishing Company
Write the number sentence.
PROBLEM SOLVING
Name
Problem Solving • Use Addition
Strategies
Draw a picture to solve.
Lesson 3.12
COMMON CORE STANDARD—1.OA.2
Represent and solve problems involving
Drawings may vary.
1. Franco has 5 crayons. He gets 8 more
crayons. Then he gets 2 more crayons.
How many crayons does he have now?
5
—
+
8
—
+
2
—
15
= —
15
— crayons
2. Jackson has 6 blocks. He gets 5 more
blocks. Then he gets 3 more blocks.
How many blocks does he have now?
6
—
+
5
—
+
3
—
= —
14
14
— blocks
© Houghton Mifflin Harcourt Publishing Company
3. Avni has 7 gifts. Then he gets 2 more
gifts. Then he gets 3 more gifts. How
many gifts does Avni have now?
7
—
+
2
—
+
3
—
= —
12
12
4. Meeka has 4 rings. She gets 2 more
rings. Then she gets 1 more ring. How
many rings does she have now?
4
—
Chapter 3
+
2
—
+
1
—
= —
7
7
— rings
sixty-three
P63
Lesson Check (1.OA.2)
1. Lila has 3 gray stones.
She has 4 black stones.
She also has 7 white stones.
How many stones does she have?
Write the number sentence.
3
14
— stones
—
+
4
+
—
—
6
+
—
=
—
—
7
14
= —
8
17
= —
2. Patrick has 3 red stickers, 6 pink
stickers, and 8 green stickers. How
many stickers does Patrick have?
Write the number sentence.
3
17
— stickers
—
+
Spiral Review (1.OA.1, 1.OA.3)
3. What is the sum of 2 + 4 or 4 + 2?
Write the number.
6
4. There are 6 black pens.
There are 3 blue pens.
How many pens are there?
Write the number.
9
— pens
P64
sixty-four
6
—
+
3
—
9
© Houghton Mifflin Harcourt Publishing Company
—
```
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