While Excel certainly is the program to use when performing calculations on large groups of numbers, Word can handle smaller calculations should the need arise.
The only downside to using formulas in a Word table is that the formula result will not automatically update if one the numbers has changed. You have to remember to tell Word that the formula result has changed.
Inserting a Formula
Click inside the cell you want to place the formula
Choose Table: Formula… from the Menu bar
Figure 41. Formula Dialog Box
3. Enter your formula
4. Enter a Number format (if desired)
5. Click OK
Updating a Formula
Select the formula in your table