Adding and Subtracting

1
Adding and Subtracting

• Integers

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
Lets PracticeClick on the correct answer.

• 1. -5 3

a. 2
b. -2
c. 8
d. -8
5

• Sorry! Try again

6

• Youve done it! Lets ride right on to the next
  one.

7
2. 4 (-3)

• a. 1

b. -1
c. 7
d. -7
8
Sorry, DudeMaybe you need new glasses! Try Again
9
HIYA! Way to Go! On to the next one!
10
3. -8 (-3)

• a. 5

b. -5
c. 11
d. -11
11
Aw! Come on! Dont look so sad! You can try again!
12
Youve unlocked the right door! Now on to
subtracting integers
13
Subtracting Integers

• When you subtract integers, its easy to remember
  the following

• COPY, CHANGE, CHANGE

14
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
15
More Practice

• 4. 2 10

a. 8
b. -8
c. 12
d. -12
16
Lets not run out of steam here! You can give it
another shot!
17
Youre blasting off! Way to go!! Blast your way
to the next one!
18
5. -5 - 15

• a. 10

b. -10
c. 20
d. -20
19
It looks like youve got more work to do! Sorry,
try again!
20
Way to Go!! Youre 1 Now on to 6
21
6. 10 (-4)

• a. 6

b. -6
c. 14
d. -14
22
OOPS! An empty locker! Try again!
23
Youve fought long and hard, but you WON the
battle!!
Click here to set it up for the next person