1. Addition and Subtraction of Integers Lead by:, Chris Killeen, Gina Sanchez, Alicia Crowe

2. Addition Basics: 2 positive numbers added together equal a positive +2 +2 =+4

3. 2 negative numbers added together equal a negative -4 + -3 = -7 ( -a + -b = -a +-b)

4. Addition of Integers To add a negative number and a positive, subtract the smaller number from the larger and attach the sign of the larger number to the resulting sum. Ex: -3+7 1)Take the smaller number and subtract it from larger number : 7-3=4 2)Next, Attach the sign of the larger number: 7 is positive so a positive 4

5. Subtraction of Integers Adding Opposites Approach Subtracting an integer is the same as adding its opposite!

6. Adding Opposites Approach 2 – (-8) add the opposite of 8 2 + 8=10 An opposite of a number is a number whose distance is the same distance from zero. -88 0 8 spaces/units

7. Subtraction of Integers In the case of a double negative: 2 negatives cancel each other out to make a positive. Ex: -3-(-4)= 1 Makes a positive

8. Game: …… Rules: Split class into 3 groups, and each group gets 3 problems to solve

9. Round #1 1. 5 + (-2) = ? A: 3

10. Round #2 2. -4 + (-3) = ? A: -7

11. Round #3 3. 6 - (-4) = ? A: 10

12. Round #4 4. -1 -9 = ? A: -10

13. Bonus Round! Q. -8 + 7 -4 = ? A: -5