Integers and Rational Numbers Cheat Sheet (What to do with Pos/Neg Numbers) Everything you need to know about integers, rational numbers, how to add/subtract/multiply/divide with them, double negatives, how subtracting is really adding the opposite, etc - all on one attractive, middle or high school friendly PDF. I found that my students needed a handy reference guide for dealing with positive and negative numbers, and I refer to this sheet constantly.