When adding and subtracting numbers it's important to be consistent with positive and negative values. Remember that two plus signs or two minus signs make a positive. One plus and one minus make ...

Let's talk about two ways to help add and subtract negative numbers. First, number discs. Each positive disc represents positive 1, or simply 1, and each negative disc represents negative 1.

You can add and subtract a set of numbers by specifying the range, such as =SUM(A1:A10). ... Instead, to subtract, you sum with negative numbers. There are a few common ways to do this.