put -1 in an empty cell.
copy that cell
select your range to change
edit|paste special|check the multiply button
clean up that cell where you added the -1



Coyote Joe wrote:

How does one change the sign of a negative number, that is, from (-100) to
100 within a cell or column or row without doing it manually? Also is there a
shortcut key for the SUM function?

Thanks!!

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Dave Peterson