SUM is the spreadsheet equivalent of an open invite: it welcomes everything into the total, whether it belongs there or not.

How to Sum a Column of Zeros in Excel. You can use the Sum function in Microsoft Office Excel to sum columns of data, whether your data is in an Excel table or is simply a range in a column of ...

The SUM formula can be applied to a certain number or cells or an indefinite series such as an entire column of data, which may grow or shrink at a later time.