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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.
Instructions. Click File, then Open.. Navigate to the spreadsheet you wish to use. Double-click the file name to open the Excel spreadsheet of your choice. Hold down Ctrl and press A.. This highlights all cells in the worksheet.In the bottom right corner of the Excel window, look for Sum= followed by the total of all filled in cells in your worksheet.ouble-click the file name to open the Excel spreadsheet of your choice. Hold down Ctrl and press A.. This highlights all cells in the worksheet. In the bottom right corner of the Excel window, look for Sum= followed by the total of all filled in cells in your worksheet.