When you want to perform a calculation on numbers in a Word table, you can create a *formula* that uses a built-in mathematical function. You construct a formula by using the tools in the Formula dialog box, which you can access by clicking Formula in the Data group on the Layout contextual tab. A formula consists of an equal sign (=), followed by a function name (such as SUM), followed by parentheses containing the location of the cells on which you want to perform the calculation. For example, the formula =SUM(Left) totals the cells to the left of the cell containing the formula.

To use a function other than SUM in the Formula dialog box, you click the function you want in the Paste Function list. You can use ...

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