Adding integers =
The sign of the larger number is the sign of the answer.
+2 plus -82 = -80
Is the same as adding its opposite
-8 - +6
-8 + -6 = -14
dog and cat method: http://www.youtube.com/watch?v=27CJH60xwuA
Multiplying and Dividing Integers
like signs are positive
different signs are negative
In other words, if the two integers have a different sign, then the product is negative,otherwise it's positive.