pradop@dadeschools.net

INTEGERS - HELP!!!


If you're having trouble with integers, here's some help:

Adding and Subtracting Integers:
When you have two signs next to each other (with no numbers in between) Rewrite the expression to simplify it:
+ + = rewrite the problem with + Ex: 3 + ( + 10 ) becomes 3 + 10
+ - = rewrite the problem with - Ex: 12 + ( - 9 ) becomes 12 - 9
- + = rewrite the problem with - Ex: 5 - ( + 7 ) becomes 5 - 7
- - = rewrite the problem with + Ex: 26 - ( - 8 ) becomes 26 + 8
After you rewrite the expression, follow these rules:
Same Sign = Add them together and keep the sign.
Ex: 5 + 8 = + 13
- 14 + ( - 20 ) becomes - 14 - 20 = - 34
Different Sign = Find the difference (subtract) and keep the sign of the bigger number.
Ex: 47 + ( - 18 ) becomes 47 - 18 = 29
- 35 - ( - 23) becomes - 35 + 23 = - 12

Multiplying and Dividing Integers:
Follow these simple rules:
Same Sign = The answer is always positive (+)
Ex: 5 x 3 = + 15
-7 x ( - 9 ) = + 63
24 / 6 = + 4
- 45 / - 9 = + 5
Different Sign = the answer is always negative (-)
Ex: 2 x ( - 8 ) = - 16
- 10 x ( + 3 ) = - 30
56 / - 7 = - 8
- 72 / 8 = - 9