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Addition and Subtraction of Integers

Addition and Subtraction of Integers. We are learning to…add and subtract positive and negative integers. Friday, June 6, 2014. Using the information that you know about adding integers turn the following subtraction problems into addition problems …. 8 + (-7). 1.

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Addition and Subtraction of Integers

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  1. Addition and Subtraction of Integers We are learning to…add and subtract positive and negative integers. Friday, June 6, 2014

  2. Using the information that you know about adding integers turn the following subtraction problems into addition problems… 8 + (-7) 1 1. 8 – 7 = ___________ Equivalent Addition Problem:_____________ 10 + (-3) 7 2. 10 – 3 = __________ Equivalent Addition Problem:_____________ 13 + (-12) 1 3. 13 – 12 = _________ Equivalent Addition Problem__________________ 15 + (-4) 11 4. 15 – 4 = _________ Equivalent Addition Problem:_________________ 17 + (-2) 15 5. 17 – 2 = _________ Equivalent Addition Problem:________________

  3. Reflection • Write about any trends or patterns you see in the “Equivalent Addition Problems” above. • What parts of the expression change? • What parts of the expression stay the same? • How can we use this to help us?

  4. Turning Subtraction into Addition • To turn subtraction into addition you must: ADD THE OPPOSITE! • This means to… • Keep the first number in the expression the same. • Change the subtraction sign into addition. • Change the second number in the expression to the opposite.

  5. 9 5 + 4 Equivalent Addition Problem:____________________ 9 7 + 2 Equivalent Addition Problem:____________________ -11 -8 + (-3) Equivalent Addition Problem:____________________ -8 2 + (-10) Equivalent Addition Problem:____________________ 3 -1 + 4 Equivalent Addition Problem:____________________ Complete the “Assessment” questions independently…for each question write an equivalent addition expression!

  6. -7 – 14 = ? • -21 • 21 • 4 • -4

  7. 16 – 25 = ? • 9 • -11 • -41 • -9

  8. 34 – (-27) = ? • -61 • 61 • -7 • 7

  9. -27 – (-25) = ? • -2 • 2 • 52 • -52

  10. Which of the following is the equivalent addition expression for -4 – (-9)? • 4 + 9 • -4 – 9 • -4 + 9 • 9 + 4

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