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Do Now Solve

Learn how to find the additive inverse when subtracting integers and solve as an addition problem. Discover what the additive inverse is and how to apply it in subtraction. Practice examples included.

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Do Now Solve

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  1. Do NowSolve • -30 + (-51) = • -34 + (-47) = • -36 + 15 = • 12 + (-42) = • 120 + (-36) = • -3 + 45 = • 27 + (-42) = 25 + 45 = -25 + 45 = 47 + (-9) = -44 + 16 = 4 + (-26) = -40 + (-5) = 41 + (-4) =

  2. Do NowSolve • -30 + (-51) = -81 • -34 + (-47) = -81 • -36 + 15 = -21 • 12 + (-42) = -30 • 120 + (-36) = 84 • -3 + 45 = 42 • 27 + (-42) = -15 25 + 45 = 70 -25 + 45 = 20 47 + (-9) = 38 -44 + 16 = -28 4 + (-26) = -22 -40 + (-5) = -45 41 + (-4) = 37

  3. Subtracting Integers • When subtracting: • Find the ADDITIVE INVERSE of the second integer • Then solve as an addition problem

  4. Subtracting Integers • When subtracting: • Find the ADDITIVE INVERSE of the second integer • Then solve as an addition problem • What is additive inverse? • It’s simply the opposite of a number

  5. Subtracting Integers • How do we find the additive inverse? • Ex. -14 – 21 =

  6. Subtracting Integers • How do we find the additive inverse? • Ex. -14 – 21 = • Change the subtraction sign to an addition sign -14 + 21 =

  7. Subtracting Integers • How do we find the additive inverse? • Ex. -14 – 21 = • Change the subtraction sign to an addition sign -14 + 21 = • Take the opposite of the second integer -14 + (-21) = -35

  8. Subtracting Integers • Try finding the additive inverse first: • Ex. 20 – 25 = • Ex. 16 – (-13) = • Ex. -21 – 14 = • Ex. -30 – (-4) =

  9. Subtracting Integers • Try finding the additive inverse first: • Ex. 20 – 25 = 20 + (-25) = -5 • Ex. 16 – (-13) = • Ex. -21 – 14 = • Ex. -30 – (-4) =

  10. Subtracting Integers • Try finding the additive inverse first: • Ex. 20 – 25 = 20 + (-25) = -5 • Ex. 16 – (-13) = 16 + (+13) = 29 • Ex. -21 – 14 = • Ex. -30 – (-4) =

  11. Subtracting Integers • Try finding the additive inverse first: • Ex. 20 – 25 = 20 + (-25) = -5 • Ex. 16 – (-13) = 16 + (+13) = 29 • Ex. -21 – 14 = -21 + (-14) = -35 • Ex. -30 – (-4) =

  12. Subtracting Integers • Try finding the additive inverse first: • Ex. 20 – 25 = 20 + (-25) = -5 • Ex. 16 – (-13) = 16 + (+13) = 29 • Ex. -21 – 14 = -21 + (-14) = -35 • Ex. -30 – (-4) = -30 + (+4) = -26

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