To start with, you don't need the + after the = sign. That is a relic from
Lotus spreadsheets, and is unnecessary in Excel.

You could use
=IF((Data!G8+Data!G9+Data!G10)-(Data!AO8+Data!AO9+Data!AO10)=0,"",(Data!X8+Data!X 9+Data!X10)/((Data!G8+Data!G9+Data!G10)-(Data!AO8+Data!AO9+Data!AO10)))or=IF(SUM(Data!G8:G 10)-SUM(Data!AO8:AO10)=0,"",SUM(Data!X8:X10)/(SUM(Data!G8:G10)-SUM(Data!AO8:AO10)))--David Biddulph"Kati" wrote in ...I need to get rid of this error. My formula is as follows:=+(Data!X8+Data!X9+Data!X10)/((Data!G8+Data!G9+Data!G10)-(Data!AO8+Data!AO9+Data!AO10)) All of the Data comes off a data spreadsheet and is then formulated into a different spreadsheet. I don't yet have all the data on the dataspreadsheet, however I will not be entering it and I need to have the formulas alreadyin place to automatically populate once the data is entered. Currently thedata for the above formula is this: X8=0, X9=0, X10=0, G8=0, G9=0, G10=0, AO8=0, AO9=0, AO10=0. Can anyonehelp me to hide this error message until the data changes? Thanks!