Grade 7 Mathematics Module 2, Topic C, Lesson 21

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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.

Downloadable Resources

Common Core Learning Standards

CCLS State Standard
7.NS.3 Solve real-world and mathematical problems involving the four operations with rational numbers.

Curriculum Map