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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.
Supposing you have a column of names in your Excel worksheet, and you need to count unique names in that column. The solution is to use the SUM function in combination with IF and COUNTIF: =SUM(IF(COUNTIF(range, range)=1,1,0))