Posted by oh noes he didnt on Saturday, November 20, 2010 at 11:32am.
http://www.mathsisfun.com/positive-negative-integers.html
http://www.mathgoodies.com/lessons/vol5/subtraction.html
To subtract integers it, you do additon of the opposite.
Example:
-2-3
now becomes
-2+-3
1
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