You can sum a series of numbers in Excel manually or automatically ... AutoSum works best when you have a column or row of numbers you want to add. 1. Click the cell under a column of numbers ...

Some data in an Excel sheet is highlighted, and the Number Format dialog box launcher icon is selected ... In this example, my team manager asked me to insert a new column between each existing column ...

Where <prefix> is the prefix to be added and <cell number of first cell> is the location of the first cell in the column to which to add the prefix. Eg. We are creating the list in column C.