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Unit 7 - Lesson 12 - Grade 2: Illustrative Mathematics

Last updated 9 months ago
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?

1

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.
1

354 - 7

Explain or show your reasoning.

1

354 - 36

Explain or show your reasoning.

1

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

1

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

624 - 38

1

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

624 - 38

1

Discuss and write the difference.

Switch roles.

Problem #2

1

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

274 - 41

1

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

274 - 41

1

Discuss and write the difference.

Switch roles.

Problem #3

1

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

336 - 115

1

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

336 - 115

1

Discuss and write the difference.

Switch roles.

Problem #4

1

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

343 - 127

1

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

343 - 127

1

Discuss and write the difference.

Switch roles.

Problem #5

1

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

485 - 266

1

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

485 - 266

1

Discuss and write the difference.

Switch roles.

Problem #6

1

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

451 - 315

1

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

451 - 315

1

Discuss and write the difference.

Switch roles.
Cool Down: Subtract
1

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