Follow the steps below for an example. Enter a cell name. Enter a minus sign and a third cell name. Press the Enter key to accept the formula. The cell will display the sum of the first two cells minus the third cell.
Formulas are just equations.
Instead of adding or subtracting numbers you are adding and subtracting the contents of a cell. Excel includes a number of predefined functions to use as well. You can combine the predefined functions into your own formula. Inc. How things get done. Use of this Web site constitutes acceptance of the eHow Terms of Use and Privacy .