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Unit 3 - Lesson 10 - Grade 3: Illustrative Mathematics
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Instructions
Lesson: Subtraction Algorithms (Part 3)
Cool Down: Choose the Method
1
Grade 3 Unit 3
Lesson 10: Subtraction Algorithms (Part 3)
CC BY 2021 Illustrative Mathematics®
Grade 3 Unit 3
Lesson 10: Subtraction Algorithms (Part 3)
CC BY 2021 Illustrative Mathematics®
Notice and Wonder: Digits that Disappear (Warm Up)
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A New Subtraction Algorithm
Andre and Clare found the value of 528 - 271. How they started their work is shown.
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Try Clare’s Algorithm
Clare used an algorithm to find the value of 538 - 156.
Try using her algorithm to find the value of each difference.
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Question 10
10.
Use an algorithm of your choice to find the value of 419 - 267.
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Question 1
1.
What do you notice?
Question 2
2.
What do you wonder?
Question 3
3.
Complete Andre's algorithm to find the diffference.
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Question 4
4.
Complete Clare's algorithm to find the diffference.
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Question 5
5.
Andre and Clare started their subtraction in different ways. How did their way of starting affect the steps
needed to find the difference?
Question 6
6.
691 - 358
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Question 7
7.
926 - 584
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Question 8
8.
317 - 182
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Question 9
9.
492 - 325
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