Select the cell where you want the total
Type `=SUM(`
Select the range of cells you want to add
Close the formula with `)`
Press Enter
Example: `=SUM(A1:A10)`
To sum non-adjacent cells, use `=SUM(A1,A3,A5)`
To sum an entire column, use `=SUM(A:A)`
To sum an entire row, use `=SUM(1:1)`
You can also click the Sigma button in the toolbar and choose Sum
You can use AutoSum by selecting a blank cell below or beside your numbers and pressing `Alt` + `=` on Windows or `Option` + `=` on Mac
