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®
What do you know about 354?
How could we represent the number 354?
Find the value of each expression in any way that makes sense to you. Explain or show your reasoning.
354 - 7
Explain or show your reasoning.
354 - 36
Explain or show your reasoning.
354 - 48
Explain or show your reasoning.
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.
Partner A: Read the expression and represent the larger number using blocks.
624 - 38
Partner B: Decide if you will decompose a ten and explain. Then subtract.
624 - 38
Discuss and write the difference.
Partner A: Read the expression and represent the larger number using blocks.
274 - 41
Partner B: Decide if you will decompose a ten and explain. Then subtract.
274 - 41
Discuss and write the difference.
Partner A: Read the expression and represent the larger number using blocks.
336 - 115
Partner B: Decide if you will decompose a ten and explain. Then subtract.
336 - 115
Discuss and write the difference.
Partner A: Read the expression and represent the larger number using blocks.
343 - 127
Partner B: Decide if you will decompose a ten and explain. Then subtract.
343 - 127
Discuss and write the difference.
Partner A: Read the expression and represent the larger number using blocks.
485 - 266
Partner B: Decide if you will decompose a ten and explain. Then subtract.
485 - 266
Discuss and write the difference.
Partner A: Read the expression and represent the larger number using blocks.
451 - 315
Partner B: Decide if you will decompose a ten and explain. Then subtract.
451 - 315
Discuss and write the difference.
Find the value of 652 - 24. Show your thinking.
