Try grouping your sheets.
click on the first worksheet tab and ctrl-click on the others.

Then edit|replace
What: 0.0342 (include the leading 0!)
with: $a$1
replace all

Rightclick on any of the grouped worksheets and select ungroup sheets.

(I'd save first and verify after!)

poorsister wrote:

I have a workbook with 30 worksheets that all have approximately 100 formulas
that read =(Cell)*.0342. I want to change the formula to read
=(Cell)*($AA$1) so I can change the value to $AA$1 as inflation changes. Is
there a way to change multiple cells at once?

--

Dave Peterson