﻿ Grade 7 Mathematics Module 2, Topic C, Lesson 21 | EngageNY

## Grade 7 Mathematics Module 2, Topic C, Lesson 21 Student Outcomes

• Students understand that if a number sentence is true and we make any of the following changes to the number sentence, the resulting number sentence will be true:
1. Adding the same number to both sides of the equation

If a = b, then a + c = b + c

1. Subtracting the same number from both sides of the equation

If a = b, then a - c = b - c

1. Multiplying each side of the equation by the same number

If a = b, then a( c )= b( c )

1. Dividing each side of the equation by the same nonzero number

If  a = b and c ≠ 0, then a ÷ c = b ÷ c

• Students revisit the integer game to justify the above referenced if-then statements. Grade 7 Mathematics Module 2, Topic C, Lesson 21: Student Version (596.03 KB) View PDF Grade 7 Mathematics Module 2, Topic C, Lesson 21: Teacher Version (727.27 KB) View PDF Grade 7 Mathematics Module 2, Topic C, Lesson 21: Student Version (220.75 KB) Grade 7 Mathematics Module 2, Topic C, Lesson 21: Teacher Version (309.27 KB)