AutoSum in excel

 AutoSum is a built-in feature in Microsoft Excel that automatically calculates the sum of a range of selected cells. To use AutoSum:

1. Select the cell where you want to display the sum.
2. Click on the AutoSum button (Σ) in the "Editing" group on the "Home" tab of the ribbon, or use the keyboard shortcut Alt+=.
3. Excel will automatically select a range of cells that it thinks you want to sum based on the adjacent cells.
4. If Excel has not selected the correct range, highlight the range of cells you want to sum and press Enter to confirm the formula.

Alternatively, you can also type "=SUM(" into the cell where you want to display the sum, and then select the range of cells you want to sum. Finish the formula with ")" and press Enter to confirm.