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Lesson 9: Understand Subtraction of Integers

Lesson 9: Understand Subtraction of Integers. In this lesson, you will learn to subtract integers. Essential Question. 1. How is subtracting integers related to the addition of integers? . Relating Addition and Subtraction. The method for changing subtraction to addition:

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Lesson 9: Understand Subtraction of Integers

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  1. Lesson 9: Understand Subtraction of Integers In this lesson, you will learn to subtract integers.

  2. Essential Question 1. How is subtracting integers related to the addition of integers? 

  3. Relating Addition and Subtraction The method for changing subtraction to addition: “Keep, Change, Flip” or “Keep, Change, Change” Keep the first number Change the subtraction sign to addition. Flip or Change the second number - positive to negative - negative to positive

  4. Quick Practice • 4 - -3 = ___ • -5 – 1= ___ • - 2 – -7 = ___

  5. Practice Problem 1 Connie records the outside temperature at 9:00 am and at noon every day. Today the 9:00 am temperature was -2 degrees F and the noon temperature was +1 degrees F. What was the change in temperature from 9:00 am to noon today?

  6. Practice Problem 2 Jason is playing a game. At the beginning of his turn, he has a score of -250 points. At the end of his turn, he has -150 points. How many points did Jason gain or lose during his game?

  7. +1 – (-3) = ___ Show this on a number line. __________________________ 0

  8. -6 – (+2) = ___ Show this on a number line. ________________________________________

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