Eu encontrei isso em MrExcel.com:
This is not beautiful but i think it worksAssuming formatting A1
First format A1 as Number with 1 decimal place
Go to Conditional Formatting New Rule Use a formula to.. (the last option)
and insert this formula =SEARCH(".0",TEXT(A1,"0.0"))
Click the Format button and pick Number with 0 decimal places
Ok, Ok
done
Now you can use the Format Painter to apply the format to other cells.
HTH
M.
Aqui está o link: link
Eu testei isso e funciona. Basta alterar as casas decimais de um para dois.