Excel considers dates and times as numbers in cells, making calculation difficult. Excel processes 6 AM as "0.25," because it is one quarter of the way through the day. If you need to add a number ...

Excel will insert the same number of columns as you've selected. How to add a column in Excel using the "Home" tab. 1. Open Microsoft Excel on your PC or Mac computer. 2.

How to use AutoSum in Excel. AutoSum works best when you have a column or row of numbers you want to add up. 1. Click the empty cell underneath the column of numbers that you want to add up.