If you have imported data from different general ledger programs you might have run into the frustration of finding that your numbers were imported into Excel as text. An easy way to turn your text back into a number so that you can perform a mathematical function with it is to right-click on it and select Convert to Number.
Another alternative is to use Text to Columns.
First, select the cell containing the value and then select Text to Columns under the Data tab and at Step 3 select Date and then Finish.
Surprisingly, this will convert text back into a number.