Unit 1- Lesson 3 - Grade 2: Illustrative Mathematics

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16 Questions

Note from the author:

Grade 2 Unit 1
Lesson 3: Relate Addition and Subtraction within 20
CC BY 2021 Illustrative Mathematics®

Instructions

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.

Make the Equation True

Find the number that makes each equation true.

4 + _______= 20

20 - _______= 4

6 + _______= 20

20 - _______= 10

_______ + 3 = 20

10.

20 - 15 = _______ 

11.

20 - _______ = 18

12.

If you have time: _______ - 5 = 20

Cool Down: Which Equations Are True?

Find the number that makes each equation true.

13.

_______ + 17 = 20

14.

20 - 9 = _______ 

15.

_______ + 5 = 20

16.

20 - _______ = 8