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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.
If you want to sum values in several columns or rows, select all the cells where you want to insert the Sum formula, and then click the AutoSum button on the ribbon or press the Excel Sum shortcut. For example, you can select cells A10, B10 and C10, click AutoSum, and total 3 columns at once.