Use `=SUM(A1:A10)` to add a range of cells
Use `=SUM(A1,A3,A5)` to add specific cells
Use `=A1+A2+A3` to add cells manually
Click the AutoSum button on the Home tab
Select the cells you want to total, then press `Alt` + `=` to insert AutoSum
Press `Enter` to calculate the sum
Include multiple ranges in one formula, such as `=SUM(A1:A5,C1:C5)`
Sum an entire column with `=SUM(A:A)`
Sum an entire row with `=SUM(1:1)`