Excel's math and trig functions perform standard mathematical and trigonometric calculations. On the next few pages, I tell you about the most commonly used ones, starting with one so popular it even has its own toolbar button: SUM.
The SUM function (Figure 5) adds up numbers. It uses the following syntax:
Although the SUM function can accept up to 30 arguments separated by commas, only one is required.
Select the cell below the column or to the right of the row of numbers you want to add.
Click the AutoSum button on the Standard toolbar once. Excel examines ...