If you're working on a single monitor, toggle between the two instances of Excel -- hover your cursor over the icon in the system tray -- to view the multiple sheets in separate windows.

You can sum cells across multiple sheets in Excel. This article presents steps for Adding single-cell values or Adding values in the range of cells.

If you want to create multiple worksheets in multiple Excel workbooks, you can set the default number of worksheets when you open Excel.

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 ...