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.

You can subtract multiple cells from one cell in Excel by using Minus sign, SUM function and Paste Special feature. Here is a tutorial on this.

Press F10, and small letters appear over each ribbon tab and quick access toolbar item. Alt+H takes you to the Home tab, ...

Adding a new column to either an entire spreadsheet or just a portion is an easy thing to do in Microsoft Excel. Here's how.