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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.
You can also create a formula by using a function. For example, the formulas =SUM(A1:A2) and SUM(A1,A2) both use the SUM function to add the values in cells A1 and A2. In addition to formulas that use a single function, you can create formulas with nested functions or arrays that calculate single or multiple results.lick the cell in which you want to enter the array formula. Enter the formula that you want to use. Tip Array formulas use standard formula syntax. They all begin with an equal sign, and you can use any of the built-in Excel functions in your array formulas.