The grammar checker included with Word is quite powerful when it comes to checking matters of style in your writing. One of the things you can have Word check for is whether you are using numbers correctly in your text. Normally, any number ten or less should be spelled out (such as "nine trucks" or "three officers"). If the number is larger than ten, it should be expressed with numerals (as in "47 pencils" or "12 pennies").
By default, Word doesn't check for the correct use of numbers. You can change this feature of Word, however, by following these steps:
Figure 1. The Spelling & Grammar tab of the Options dialog box.
Figure 2. The Grammar Settings dialog box.
As with most other grammar-checking tools, you should not rely exclusively on this particular checking feature to correct all your incorrect usage. There are actually some pretty complex rules that writers and editors should follow when using numbers within text. For more information, refer to a good style guide, such as the Chicago Manual of Style.
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