Use a minus sign (Unicode character 2212) instead of a hyphen.
Alternatively, you can use a nonbreaking hyphen (Ctrl+Shift+Hyphen).

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Suzanne S. Barnhill
Microsoft MVP (Word)
Words into Type
Fairhope, Alabama USA
Word MVP FAQ site: http://word.mvps.org
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"Littlebear" wrote in message
...
When I type -1234 at end of a sentence, the "negative" sign stays on the
first line, but the number wraps to the second.

How do I keep them together without having to hard return?

Thanks!