Download Model Regrouping for Addition Lesson 4.4

Lesson 4.4
Name
Model Regrouping for Addition
Number and Operations
in Base Ten—2.NBT.B.5
MATHEMATICAL PRACTICES
MP1, MP5, MP7
Essential Question When do you regroup
in addition?
Listen
Listen and
and Draw
Draw
Hands
On
Use
to model the problem.
Draw quick pictures to show what you did.
© Houghton Mifflin Harcourt Publishing Company
Tens
Ones
Math
Talk
FOR THE TEACHER • Read the following
problem. Brandon has 24 books. His friend Mario
has 8 books. How many books do they have?
Chapter 4
MATHEMATICAL PRACTICES 5
Use Tools Describe
how you made a ten in
your model.
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255
Model
Model and
and Draw
Draw
Add 37 and 25.
Step 1
Look at the
ones. Can you make
a ten?
Tens
yes
Step 2
If you can
make a ten, regroup.
Ones
Tens
Ones
no
Trade 10 ones for
1 ten to regroup.
Share
hhow
Share and
and Show
Sh
Step 3
Write how
many tens and ones.
Write the sum.
Tens
Ones
— tens — ones
—
MATH
M
BOARD
B
Draw to show the regrouping. Write how many
tens and ones are in the sum. Write the sum.
Tens
Ones
2. Add 48 and 8.
Tens
Ones
3. Add 26 and 38.
Tens
Ones
— tens — ones
— tens — ones
— tens — ones
—
—
—
256
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1. Add 47 and 15.
Name
On
On Your
Your Own
Own
Draw to show if you regroup. Write how many
tens and ones are in the sum. Write the sum.
4. Add 79 and 6.
Tens
Ones
Tens
Ones
6. Add 23 and 39.
Tens
Ones
— tens — ones
— tens — ones
— tens — ones
—
—
—
7. Add 54 and 25.
Tens
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5. Add 18 and 64.
Ones
8. Add 33 and 7.
Tens
Ones
9. Add 27 and 68.
Tens
Ones
— tens — ones
— tens — ones
— tens — ones
—
—
—
10.
SMARTER
Kara has 25 toy animals
and 12 books. Jorge has 8 more toy
animals than Kara has. How many
toy animals does Jorge have?
— toy animals
Chapter 4 • Lesson 4
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257
MATHEMATICAL PRACTICES 8E8CPQ<›CFFB=FIJKIL:KLI<›GI<:@J@FE
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Math
Write or draw to explain.
11.
MATHEMATICAL
PRACTICE
1
Make Sense of
Problems Mrs. Sanders has two
fish tanks. There are 14 fish in
the small tank. There are 27 fish
in the large tank. How many fish
are in the two tanks?
— fish
SMARTER
Charlie climbed 69 steps.
Then he climbed 18 more steps. Show
two different ways to find how many
steps Charlie climbed.
Charlie climbed — steps.
TAKE HOME ACTIVITY • Ask your child to write a word problem
with 2-digit numbers about adding two groups of stamps.
258
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12.
Practice and Homework
Name
Model Regrouping for Addition
Draw to show the regrouping. Write how
many tens and ones in the sum. Write the sum.
1. Add 63 and 9.
Tens
Ones
— tens — ones
2. Add 25 and 58.
Tens
— tens — ones
—
COMMON CORE STANDARD—2.NBT.B.6
Use place value understanding and properties of
operations to add and subtract.
3. Add 58 and 18.
Tens
Ones
— tens — ones
—
—
5. Add 17 and 77.
Tens
Ones
— tens — ones
—
4. Add 64 and 26.
Tens
Ones
Lesson 4.4
Ones
— tens — ones
—
6. Add 16 and 39.
Tens
Ones
— tens — ones
—
© Houghton Mifflin Harcourt Publishing Company
Problem
Problem Solving
Solving
Choose a way to solve. Write or draw to explain.
7. Cathy has 43 leaves in her collection. Jane has 38 leaves.
How many leaves do the two children have?
8.
Chapter 4
Math
— leaves
Suppose you are adding 43 and 28. Will you regroup? Explain.
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Lesson Check
(2.NBT.B.6)
1. Add 27 and 48. What is the
sum?
Tens
Ones
—
(2.OA.B.2, 2.OA.C.3, 2.NBT.B.6)
2. What is the sum?
7+75—
4. What is the sum?
39 + 46 5 —
260
3. Circle the odd number.
6
12
21
22
5. What is the sum?
5+3+4=—
FOR MORE PRACTICE
GO TO THE
two hundred sixty
Personal Math Trainer
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