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Writing a Sum Formula. 1  1. Decide what column of numbers or words you would like to add up. 2  2. Select the cell where you'd like the answer to populate. 3  3. Type the equals sign then SUM.  4. Type out the first cell reference, then a colon, then the last cell 1  reference. 5. Press enter.
Excel SUM Function Shortcuts. The SUM function is used to quickly to add up columns or rows of numbers, and it is one of the most commonly used functions in Excel. So popular is it that Microsoft has created two shortcuts to make it even easier to carry out this operation. Two shortcuts for using Excel's SUM function are: