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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.
How does the sumif statement work? In Excel the SUM function is very commonly used, but there are times when you need to sum only the data that is subject to a criteria setting. The SUM function cannot cope with this, however, Excel provides the SUMIF statement, which can. The SUMIF statement works by using the following syntax: =SUMIF(Range,Criteria,[Sum Range]) Items in square brackets are optional. Monthly Sales Transactions. The SUMIF formula is written into cell C15 and produces a result of Â£9,493.50.