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Unit 7 - Lesson 12 - Grade 2: Illustrative Mathematics
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Instructions
Lesson: Decompose to Subtract
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Cool Down: Subtract
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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®
What Do You Know About 354? (Warm Up)
Question 1
1.
What do you know about 354?
Question 2
2.
How could we represent the number 354?
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Subtract from 354
Find the value of each expression in any way that makes sense to you. Explain or show your reasoning.
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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
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Problem #2
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Problem #3
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Problem #4
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Problem #5
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Problem #6
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Question 24
24.
Find the value of 652 - 24. Show your thinking.
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Question 3
3.
354 - 7
Explain or show your reasoning.
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Question 4
4.
354 - 36
Explain or show your reasoning.
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Question 5
5.
354 - 48
Explain or show your reasoning.
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Question 6
6.
Partner A: Read the expression and represent the larger number using blocks.
624 - 38
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Question 7
7.
Partner B: Decide if you will decompose a ten and explain. Then subtract.
624 - 38
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Question 8
8.
Discuss and write the difference.
Switch roles.
Question 9
9.
Partner A: Read the expression and represent the larger number using blocks.
274 - 41
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Question 10
10.
Partner B: Decide if you will decompose a ten and explain. Then subtract.
274 - 41
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Question 11
11.
Discuss and write the difference.
Switch roles.
Question 12
12.
Partner A: Read the expression and represent the larger number using blocks.
336 - 115
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Question 13
13.
Partner B: Decide if you will decompose a ten and explain. Then subtract.
336 - 115
visibility
View drawing
Question 14
14.
Discuss and write the difference.
Switch roles.
Question 15
15.
Partner A: Read the expression and represent the larger number using blocks.
343 - 127
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Question 16
16.
Partner B: Decide if you will decompose a ten and explain. Then subtract.
343 - 127
visibility
View drawing
Question 17
17.
Discuss and write the difference.
Switch roles.
Question 18
18.
Partner A: Read the expression and represent the larger number using blocks.
485 - 266
visibility
View drawing
Question 19
19.
Partner B: Decide if you will decompose a ten and explain. Then subtract.
485 - 266
visibility
View drawing
Question 20
20.
Discuss and write the difference.
Switch roles.
Question 21
21.
Partner A: Read the expression and represent the larger number using blocks.
451 - 315
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Question 22
22.
Partner B: Decide if you will decompose a ten and explain. Then subtract.
451 - 315
visibility
View drawing
Question 23
23.
Discuss and write the difference.
Switch roles.