Integer addition operation sign rules:

1) Like signs you add (- 8) + (- 7) = (-15) or (+ 3) + (+ 5) = + 8

2) Unlike signs you subtract ( + 2) + (- 5)= -3 or (- 8) + ( + 4) = (- 4)

3) Take the sign of the highest number (yes number).

A scrap box should be used to do the calculations. Try not to get into the habit of doing your scrap work on another piece of paper. It is much easier to find a mistake if all the work is in front of you and located close to the problem.

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