If the two Excel workbooks have the same name, you cannot open them at the same time. For this, either close one of them and then open the other or change the name of one of them.

Microsoft's Excel software is one of the best tools for you to organize, analyze, and manipulate data. Here are three ways to compare data in two columns.

Microsoft Excel 2010 provides a formula for calculating the average value from multiple worksheets in a workbook. Before you apply this formula, check that each worksheet is formatted the same way.