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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.
1. Select a cell. 2. To let Excel know that you want to enter a formula, type an equal sign (=). 3. For example, type the formula A1+A2. Tip: instead of typing A1 and A2, simply select cell A1 and cell A2. 4. Change the value of cell A1 to 3. Excel automatically recalculates the value of cell A3.