Adding and SubtractingAdding and Subtracting

IntegersIntegers

When When addingadding integers, integers, remember the following remember the following

pneumonic devices:pneumonic devices:

L A S SL A S S U S B

Adding Like Terms (Adding Like Terms (LASSLASS)) -6 + (-8) -6 + (-8) LLike signs, so simply ike signs, so simply AAdddd = 14, and then keep the = 14, and then keep the ssame ame ssignign

-

Adding Unlike Terms (USB)6 + (-8) Unlike signs, so Subtract 8

- 6

2

-= 2Then keep the sign of the Bigger number

Let’s PracticeLet’s PracticeClick on the correct answer.Click on the correct answer.

1. 1. -5 + 3 =-5 + 3 =

a. 2b. -2

c. 8

d. -8

Sorry! Sorry! Try againTry again

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

2. 4 + (-3)2. 4 + (-3)

a. 1a. 1

b. -1

c. 7d. -7

Sorry, Dude—Maybe you need new glasses!

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On to the next one!

3. -8 + (-3) =3. -8 + (-3) =

a. 5a. 5

b. -5

c. 11d. -11

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

You’ve unlocked the right door! Now on to subtracting integers

Subtracting IntegersSubtracting Integers

When you subtract integers, it’s easy When you subtract integers, it’s easy to remember the following: to remember the following:

COPY, CHANGE, COPY, CHANGE, CHANGECHANGE

COPY, CHANGE, CHANGECOPY, CHANGE, CHANGE

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-

More PracticeMore Practice

4. 2 – 10 =4. 2 – 10 =

a. 8

b. -8

c. 12

d. -12

Let’s not run out of steam here! You can give it another shot!

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

5. -5 - 155. -5 - 15

a. 10a. 10

b. -10

c. 20

d. -20

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

Way to Go!!You’re #1Now on to #6

6. 10 – (-4)6. 10 – (-4)

a. 6a. 6

b. -6

c. 14d. -14

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