Practice subtracting positive and negative integers by using the Keep Change Change strategy.

For each problem, use Keep Change Change. Keep the first integer, change subtraction to addition, and change the sign of the second integer. Show your work in the space provided.

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Use Keep Change Change to rewrite subtraction as addition

Math - Grade 6-8

Instructions: For each problem, use Keep Change Change. Keep the first integer, change subtraction to addition, and change the sign of the second integer. Show your work in the space provided.
  1. 1

    Use Keep Change Change to solve: 7 - 12

  2. 2

    Use Keep Change Change to solve: -4 - 9

  3. 3

    Use Keep Change Change to solve: 6 - (-8)

  4. 4

    Use Keep Change Change to solve: -10 - (-3)

  5. 5

    Use Keep Change Change to solve: 15 - 21

  6. 6

    Use Keep Change Change to solve: -18 - 6

  7. 7

    Use Keep Change Change to solve: 3 - (-14)

  8. 8

    Use Keep Change Change to solve: -25 - (-11)

  9. 9

    A submarine is at a depth of -40 meters. It descends 15 more meters. Write and solve an integer subtraction expression for the new depth.

  10. 10

    The temperature was -6 degrees in the morning. By evening, the temperature was 9 degrees lower. Write and solve an integer subtraction expression for the evening temperature.

  11. 11

    Find the missing value: 12 - (-5) = ___

  12. 12

    Find the error in this work and correct it: -8 - (-10) = -8 + (-10) = -18

LivePhysics™.com Math - Grade 6-8