A complex Excel 2007 workbook could require multiple sheets. By default, Microsoft provides three sheets on each workbook, but you can add as many as you need. Clicking the "Insert Worksheet" button ...

Hide everything but the working area in an Excel worksheet Your email has been sent If you’ve ever opened a Microsoft Excel workbook to find no columns, rows and/or scrollbars, this is probably why: ...

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.