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Unit 7 - Lesson 12 - Grade 2: Illustrative Mathematics

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24 Questions
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Grade 2 Unit 7
Lesson 12: Decompose to Subtract
CC BY 2021 Illustrative Mathematics®
Grade 2 Unit 7
Lesson 12: Decompose to Subtract
CC BY 2021 Illustrative Mathematics®
Lesson: Decompose to Subtract

What Do You Know About 354? (Warm Up)

1.

What do you know about 354?

2.

How could we represent the number 354?

Subtract from 354

Find the value of each expression in any way that makes sense to you. Explain or show your reasoning.
3.

354 - 7

Explain or show your reasoning.

4.

354 - 36

Explain or show your reasoning.

5.

354 - 48

Explain or show your reasoning.

Decompose with Base-ten Blocks

Work with your partner to find the value of each expression.
  • Partner A: Read the expression and represent the larger number using blocks.
  • Partner B: Decide if you will decompose a ten and explain. Then subtract.
  • Discuss and write the difference.
  • Switch roles.

Problem #1

6.

Partner A: Read the expression and represent the larger number using blocks.

624 - 38

7.

Partner B: Decide if you will decompose a ten and explain. Then subtract.

624 - 38

8.

Discuss and write the difference.

Switch roles.

Problem #2

9.

Partner A: Read the expression and represent the larger number using blocks.

274 - 41

10.

Partner B: Decide if you will decompose a ten and explain. Then subtract.

274 - 41

11.

Discuss and write the difference.

Switch roles.

Problem #3

12.

Partner A: Read the expression and represent the larger number using blocks.

336 - 115

13.

Partner B: Decide if you will decompose a ten and explain. Then subtract.

336 - 115

14.

Discuss and write the difference.

Switch roles.

Problem #4

15.

Partner A: Read the expression and represent the larger number using blocks.

343 - 127

16.

Partner B: Decide if you will decompose a ten and explain. Then subtract.

343 - 127

17.

Discuss and write the difference.

Switch roles.

Problem #5

18.

Partner A: Read the expression and represent the larger number using blocks.

485 - 266

19.

Partner B: Decide if you will decompose a ten and explain. Then subtract.

485 - 266

20.

Discuss and write the difference.

Switch roles.

Problem #6

21.

Partner A: Read the expression and represent the larger number using blocks.

451 - 315

22.

Partner B: Decide if you will decompose a ten and explain. Then subtract.

451 - 315

23.

Discuss and write the difference.

Switch roles.
Cool Down: Subtract
24.

Find the value of 652 - 24. Show your thinking.