Adding and Subtracting Integers Worksheets - Math Worksheets Center While adding two positive numbers, you only need to count ahead of a number until the other number asks you to do. For example, if you are adding 5 and 6, then starting from 5, you just have to count 6 times, and that will give you the answer of 11. In the case of addition or subtraction with negative numbers, things are a bit different.