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Add the values in a column or row by using a button. You can use AutoSum to quickly sum a range of numbers in a column or row. Click an empty cell below a column of numbers or to the right of a row of numbers, and then click AutoSum. Excel selects what it determines to be the most likely range of data.
How To Use the SUM function: 1  Select the cell where you want the result to appear (ex: A4). 2  Type =SUM. 3  Enter a parenthesis. 4  Select the range of cells you want add together OR type in the cell references.5  Enter another parenthesis.ow To Use AUTOSUM : You can use AUTOSUM to automatically enter the SUM function and add a list of numbers. When you click on the button, Excel will guess the range of cells you want to add. You are able to change that range. 1  Select the cell in which you want to result to appear.