Changing the sign of a group of cells

[David]

I want to change the sign simultaneously of an array of numbers in an Excel
worksheet. I do not want to have to multiple each one by -1 as a separate
operation.

 

[Brian Tillman]

I want to change the sign simultaneously of an array of numbers in an
Excel worksheet. I do not want to have to multiple each one by -1 as
a separate operation.

How is this an Outlook question?