I have a cell in one spread sheet that has =CONCATENATE(G5,H5), it combines the number 8080810 and 813600 to make 8080810813600. I have I have other cells with the same formula. In another spread sheet I have a Vlookup formula that looks at a cell with the number in it that should be the same returning an N/A because obviously the number doesn't match the number in the table. When I type the number in the cell that the lookup is looking at it comes out as 8.08081E+12 if I copy and paste special the CONCATENATE formula the lookup works fine. Like I said there are other formula's and numbers just like the one I listed that work fine it appears to be a problem with the new numbers I'm typing in. I think it must have something to do with the format.