You can create your own custom format in Excel to highlight negative numbers. Select the range of cells containing the numbers. On the Home tab in the Numbers group, click the small arrow button ...

The most obvious way to increment a number in Excel is to add a value to it. Start with any value in cell A1, and enter "=A1+1" in cell A2 to increment the starting value by one.

How to subtract in Excel using cell references. You don't have to subtract numbers in a single cell; you can also set up a formula that will subtract the values stored in multiple cells.