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 MathematicsĀ®
Grade 2 Unit 1
Lesson 3: Relate Addition and Subtraction within 20
CC BY 2021 Illustrative MathematicsĀ®
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
20 - 15 = _______
20 - _______ = 18
If you have time: _______ - 5 = 20
Cool Down: Which Equations Are True?
Find the number that makes each equation true.
_______ + 17 = 20
20 - 9 = _______
_______ + 5 = 20
20 - _______ = 8