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Unit 3 - Lesson 9 - Grade 3: Illustrative Mathematics
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Instructions
Lesson: Subtraction Algorithms (Part 2)
Cool Down: How Did Andre Subtract?
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Grade 3 Unit 3
Lesson 9: Subtraction Algorithms (Part 2)
CC BY 2021 Illustrative Mathematics®
Grade 3 Unit 3
Lesson 9: Subtraction Algorithms (Part 2)
CC BY 2021 Illustrative Mathematics®
True or False: Does It Commute? (Warm Up)
Decide if each statement is true or false. Be prepared to explain your reasoning.
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Revise Subtraction Work
Lin’s work for finding the value of is shown.
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Try the Algorithm
Here is a subtraction algorithm you saw in an earlier lesson:
Try using this algorithm to find the value of each difference. Show your reasoning. Organize it so it can be followed by others.
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Question 14
14.
Andre found the value of 739 - 255. His work is shown.
Explain how he subtracted and the value he found for 739 - 255.
Question 1
1.
Question 2
2.
Explain your reasoning.
Question 3
3.
Question 4
4.
Explain your reasoning.
Question 5
5.
Question 6
6.
Explain your reasoning.
Question 7
7.
What error do you see in Lin's work?
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Question 8
8.
What would you tell or show Lin so she can revise her work?
Question 9
9.
283 - 159
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Question 10
10.
425 - 192
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Question 11
11.
639 - 465
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Question 12
12.
591 - 128
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Question 13
13.
832 - 575
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4 x 5 = 5 x 4
True
False
125 + 200 = 200 + 125
True
False
300 - 100 = 100 - 300
True
False