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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.
Add or subtract time. Not many people can easily add two different times together to get a total, or subtract one time from another to get the total time spent working on a project. Fortunately, Excel can easily add or subtract time, using simple formulas.n cell D2, subtract the end time from the start time by typing the formula: =C2-B2, and then pressing Enter. We need to format cell D2 to get rid of â AM .â. Follow step 4 under Add up more than 24 hours.