Unit 1- Lesson 3 - Grade 2: Illustrative Mathematics

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Grade 2 Unit 1

Lesson 3: Relate Addition and Subtraction within 20

CC BY 2021 Illustrative Mathematics®

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Grade 2 Unit 1

Lesson 3: Relate Addition and Subtraction within 20

CC BY 2021 Illustrative Mathematics®

Lesson: Relate Addition and Subtraction within 20

Number Talk: Addition and Subtraction (Warm Up)

Find the value of each expression mentally.

Find the number that makes each equation true.

4 + = 20

20 - = 4

Cool Down: Which Equations Are True?

Find the number that makes each equation true.

+ 17 = 20

20 - 9 =

+ 5 = 20

20 - = 8