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K-5 Grade 2 Unit 7 Lesson 15

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Lesson 15

Warm-up Activity 1 Activity 2

Unit 7, Lesson 15

Decompose a Ten and a Hundred to Subtract

Grade 2

Warm-up

None

Activity 1

Elena’s thinking

Step 1

Subtraction. 7 hundreds, 2 tens, 6 ones minus 5 hundreds, 5 tens, 8 ones.

Step 2

Subtraction. 7 hundreds, 2 tens, 6 ones minus 5 hundreds, 5 tens, 8 ones. Decomposing 2 tens and 6 ones to 1 ten and 16 ones.

Step 3

Subtraction. 7 hundreds, 2 tens, 6 ones, decomposed into 6 hundreds, 11 tens, 16 ones minus 5 hundreds, 5 tens, 8 ones.

Use a base-ten diagram or blocks to show Elena’s steps.
Finish her work. Find the value of .
What is another way to use numbers or equations to show subtracting by place to find the value of ?

Activity 2

Find someone with a different number than you.
Find the difference between your numbers.
Show your thinking, using drawings, numbers, or words.
Trade cards. Find a new partner.

Partner 1:
Partner 2:
Partner 3:

Students playing card game with base ten blocks.