What have you tried? And what version of Word are you using?
Using Word 2003 (probably earlier versions, too), you need to use field
codes to perform the multiplication. Suppose I have a 1-row table, with 5
and 6, and I want to multiply them:
5 | 6 | {=a1 * b1}
The formula shown needs to be inserted inside field braces. You insert field
braces (among other ways) by pressing Ctrl+F9. Then insert the formula as
shown (including = sign). Finally, press F9 to update the field and get the
result.

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Herb Tyson MS MVP
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>I am trying to create a requisition form and I want to multiply the
>quantity
[quoted text clipped - 5 lines]
> tax
> rate. I couldn't find anything in Help that actually helped.