For example, instead of adding several numbers one by one, which can take a while, you can use the =SUM(A2:A6) function. This tells Excel to add all the numbers from cells A2 to A6 in one simple step.

To check your work, click the cell with the sum and look at the formula bar atop the screen. It will show the details of the calculation. Insider receives a commission when you buy through our links.