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Unit 7 - Lesson 12 - Grade 2: Illustrative Mathematics
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Instructions
Lesson: Decompose to Subtract
1
1
Cool Down: Subtract
1
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.
1
Question 3
3.
354 - 7
Explain or show your reasoning.
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Question 4
4.
354 - 36
Explain or show your reasoning.
visibility
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1
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
Question 6
6.
Partner A: Read the expression and represent the larger number using blocks.
624 - 38
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1
Question 7
7.
Partner B: Decide if you will decompose a ten and explain. Then subtract.
624 - 38
visibility
View drawing
1
Problem #2
1
Question 9
9.
Partner A: Read the expression and represent the larger number using blocks.
274 - 41
visibility
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1
Question 10
10.
Partner B: Decide if you will decompose a ten and explain. Then subtract.
274 - 41
visibility
View drawing
1
Problem #3
1
Question 12
12.
Partner A: Read the expression and represent the larger number using blocks.
336 - 115
visibility
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1
Question 13
13.
Partner B: Decide if you will decompose a ten and explain. Then subtract.
336 - 115
visibility
View drawing
1
Problem #4
1
Question 15
15.
Partner A: Read the expression and represent the larger number using blocks.
343 - 127
visibility
View drawing
1
Question 16
16.
Partner B: Decide if you will decompose a ten and explain. Then subtract.
343 - 127
visibility
View drawing
1
Problem #5
1
Question 18
18.
Partner A: Read the expression and represent the larger number using blocks.
485 - 266
visibility
View drawing
1
Question 19
19.
Partner B: Decide if you will decompose a ten and explain. Then subtract.
485 - 266
visibility
View drawing
1
Problem #6
1
Question 21
21.
Partner A: Read the expression and represent the larger number using blocks.
451 - 315
visibility
View drawing
1
Question 22
22.
Partner B: Decide if you will decompose a ten and explain. Then subtract.
451 - 315
visibility
View drawing
1
Question 24
24.
Find the value of 652 - 24. Show your thinking.
visibility
View drawing
Question 5
5.
354 - 48
Explain or show your reasoning.
visibility
View drawing
Question 8
8.
Discuss and write the difference.
Switch roles.
Question 11
11.
Discuss and write the difference.
Switch roles.
Question 14
14.
Discuss and write the difference.
Switch roles.
Question 17
17.
Discuss and write the difference.
Switch roles.
Question 20
20.
Discuss and write the difference.
Switch roles.
Question 23
23.
Discuss and write the difference.
Switch roles.