1. Integer Addition and Subtraction

2. Integer Addition Rules Rule #1 – If the signs are the same, pretend the signs aren’t there. Add the numbers and then put the sign of the addends in front of your answer. 9 + 5 = 14 -9 + -5 = -14

3. Integer Addition Rules Rule #2 – If the signs are different pretend the signs aren’t there. Subtract the smaller from the larger and put the sign of the larger in front of your answer. -9 + 5 = 9 - 5 = 4 Larger number Answer = - 4

4. When adding integers, remember the following pneumonic devices: L A S S U S B

5. Adding Like Terms (LASS) -6 + (-8) Like signs, so simply Add = 14, and then keep the same sign - Adding Unlike Terms (USB) 6 + (-8) Unlike signs, so Subtract 8 - 6 2 -= -2 Then keep the sign of the Bigger number

6. Solve the Problems -3 + -5 = 4 + 7 = (+3) + (+4) = -6 + -7 = 5 + 9 = -9 + -9 =

7. Solve These Problems 3 + -5 = -4 + 7 = 3 + (-4) = -6 + 7 = 5 + -9 = -9 + 9 =

8. One Way to Add Integers Is With a Number Line 0123456-2-3-4-5-6 When the number is positive count to the right. When the number is negative count to the left. +-

9. One Way to Add Integers Is With a Number Line 0123456-2-3-4-5-6 + - 3 + -5 =-2

10. One Way to Add Integers Is With a Number Line 0123456-2-3-4-5-6 + - 6 + -4 =+2

11. One Way to Add Integers Is With a Number Line 0123456-2-3-4-5-6 + - 3 + -7 =-4

12. One Way to Add Integers Is With a Number Line 0123456-2-3-4-5-6 - + -2 + 8 =+6

13. One Way to Add Integers Is With a Number Line 0123456-2-3-4-5-6 - + -5 + 2 =-3

14. One Way to Add Integers Is With a Number Line 0123456-2-3-4-5-6 - - -4 + -2 =-6

15. One Way to Add Integers Is With a Number Line 0123456-2-3-4-5-6 - - -2 + -3 =-5

16. One Way to Add Integers Is With a Number Line 0123456-2-3-4-5-6 - - -4 + -1 =-5

17. One Way to Add Integers Is With a Number Line 0123456-2-3-4-5-6 + + 3 + 2 =5

18. Subtracting Integers When you subtract integers, it’s easy to remember the following: COPY, CHANGE, CHANGE

19. 4 – 9 Copy the first number 4+(-9) Change the minus sign to addition Change the second number to its opposite (sign) Now you are adding unlike signs (USB), so subtract 9 - 4 And Keep the sign of the bigger number = 5 -

20. Practice 2-10 = 3-(-2) = 1-9 = -4 – 2= -22 – (-7) =