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Unit 3 - Lesson 8 - Grade 3: Illustrative Mathematics

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Grade 3 Unit 3
Lesson 8: Subtraction Algorithms (Part 1)
CC BY 2021 Illustrative Mathematics®
Grade 3 Unit 3
Lesson 8: Subtraction Algorithms (Part 1)
CC BY 2021 Illustrative Mathematics®
Lesson: Subtraction Algorithms (Part 1)

Number Talk: Subtraction Strategies (Warm Up)

Find the value of each expression mentally.
1.

100 - 98

2.

101 - 99

3.

200 - 98

4.

204 - 98

From Drawings to an Algorithm

Jada and Kiran found the value of 391 - 215. Their work is shown.

5.

Explain how Kiran’s algorithm starts.

6.

Explain how Kiran recorded the decomposition of the ten into more ones.

7.

Finish Kiran’s work.

Card Sort: Diagrams and Algorithms

Your teacher will give you a set of cards. Match each diagram with an algorithm.
8.

Match each diagram with an algorithm.

Cool Down: Connect a Diagram and an Algorithm
9.

Explain how the diagram matches the algorithm.