For third graders learning Common Core math in Georgia, there are four ways to subtract—and only four ways allowed.

If you can subtract two 3-digit numbers from each other, then you can use the same method to subtract two 4-digit numbers. You use the same method, no matter how many digits are in the numbers.

How to subtract within a cell Just need to quickly subtract two numbers? You can do that within a single cell in an Excel spreadsheet. Step 1: In an Excel spreadsheet, click on an empty cell. Then ...