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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.
Formula 1: SUMIF() function: With the following two SUMIF functions, you can quickly calculate the sum of the absolute values, do as this: 1. In a blank cell which you want to put the result, enter this formula =SUMIF(A2:A11,>0) - SUMIF(A2:A11,<0) or =SUM(SUMIF(A2:A11,{>0,<0})*{1,-1}), and press the Enter key. See screenshots: