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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.
In Excel, the SUMIF function can help you to add up only the positive values or negative values. You can apply this formula as this: 1. Type this formula =SUMIF($A$1:$D$7,>0) into a blank cell, see screenshot: 2. Then press Enter key, and just all of the positive numbers have been added up. Notes: 1.