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2. When adding integers, remember the following pneumonic devices: U S B L A S S dd ign ame ubtract ike signs nlike signs igger number

3. 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

4. Let’s PracticeClick on the correct answer. 1. -5 + 3 = a. 2 b. -2 c. 8 d. -8

5. Sorry! Try again

6. You’ve done it! Let’s ride right on to the next one.

7. 2. 4 + (-3) a. 1 b. -1 c. 7 d. -7

8. HI—YA! Way to Go! On to the next one!

9. 3. -8 + (-3) = a. 5 b. -5 c. 11 d. -11

10. Aw! Come on! Don’t look so sad! You can try again!

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

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

13. More Practice 4. 2 – 10 = a. 8 b. -8 c. 12 d. -12

14. You’re blasting off! Way to go!! Blast your way to the next one!

15. 5. -5 - 15 a. 10 b. -10 c. 20 d. -20

16. It looks like you’ve got more work to do! Sorry, try again!

17. Way to Go!! You’re #1 Now on to #6

18. 6. 10 – (-4) a. 6 b. -6 c. 14 d. -14

19. OOPS! An empty locker! Try again!

20. You’ve fought long and hard, but you WON the battle!! Click here to set it up for the next person