When adding or subtracting negative numbers it can be useful to use a number line . To add and subtract numbers always begin counting from zero. When adding positive numbers, count to the right.

Learn how to highlight cells with negative values in Excel. Make negative numbers stand out in Red using Conditional or Custom Formatting.

To our mathematical predecessors, it wasn’t even clear negative numbers were numbers at all—they do not, after all, represent quantities in exactly the same way as positive numbers do!