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Unit 3 - Lesson 10 - Grade 3: Illustrative Mathematics

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Last updated 2 months ago
10 Questions
Note from the author:
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®
Lesson: Subtraction Algorithms (Part 3)

Notice and Wonder: Digits that Disappear (Warm Up)

1.

What do you notice?

2.

What do you wonder?

A New Subtraction Algorithm

Andre and Clare found the value of 528 - 271. How they started their work is shown.

3.

Complete Andre's algorithm to find the diffference.

4.

Complete Clare's algorithm to find the diffference.

5.

Andre and Clare started their subtraction in different ways. How did their way of starting affect the steps
needed to find the difference?

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.

6.

691 - 358

7.

926 - 584

8.

317 - 182

9.

492 - 325

Cool Down: Choose the Method
10.

Use an algorithm of your choice to find the value of 419 - 267.