1. Adding Integers

2. How do I add integers if the signs are the same? How do I add integers if the signs are the same? Examples: Examples: 1. r = 23 + 34 2. s = -9 + -6 3. - 4 + (-3) = q 4. + 7 + + 11 = t IF THE SIGNS ARE THE SAME IF THE SIGNS ARE THE SAME Add the integers Sign of the bigger number! r = 57 s = -15 -7 = q +18 = t

3. How do I add integers if the signs are different? How do I add integers if the signs are different?Examples 1. f = (-17) + 20 2. m = 52 + (-60) 3. 6 + (-3) = s 4. g = 3 + (-8) IF THE SIGNS ARE DIFFERENT: IF THE SIGNS ARE DIFFERENT: Subtract Take the sign of the bigger number! f = 3 m = -8 3 = s g = -5

4. When solving an equation, look inside See if positives and negatives are side by side. If this is the situation that exists, Then the rules for add’n subtract take on a new twist. If the operation sign in the middle is a plus, Then look at the signs on the numbers it really is a must.

5. Chorus:Same-AddDifferent-Subtract Take the sign of the bigger number. Same-AddDifferent-Subtract

6. More examples 1. m = -10 + 8 m = -2 2. d = 7 + 20 d = 27 3. w = -4 + (-3) w = -7 4. b = 5 + (-2) b = 3 5. d = - 5 + + 5 d = 0

7. Adding Integer Rules Same signs – add and take the sign of the bigger number Same signs – add and take the sign of the bigger number ex: 5 + 8 = 13 ex: - 5 + -8 = - 13 Different signs – subtract and take the sign of Different signs – subtract and take the sign of the bigger number the bigger number ex: - 8 + 5 = - 3 ex: 8 + - 3 = 5

8. Let’s get started on our assignment! “Sum Up” Worksheet – I hope you were paying attention!!! It’s time to test your knowledge......

9. Adding Integers Adding Integers How can I use a number line to model addition of integers? How can I use a number line to model addition of integers? Graph the first integer Graph the first integer Move the point to the ________ if the second integer is positive. Move the point to the ________ if the second integer is positive. Move the point to the ________ if the second integer is negative. Move the point to the ________ if the second integer is negative.

10. Example: -7 + -5 = ? Example: -7 + -5 = ? Graph your point at -7 Graph your point at -7 Move to the _____ because the second integer is negative. Move to the _____ because the second integer is negative. The point is now at _____. The point is now at _____.