The SUM formula does exactly what you would expect. It allows you to add 2 or more numbers together.

There are three ways you can use this formula in excel (for beginners)

An "argument" can be thought of as any number that you wish to add. (up to a total of 255 items)

Example: I want to add 2+2 so I can use the formula =SUM(2, 2)

2) By triple-click anywhere within a paragraph you select the entire paragraph in Word. Or press the CTRL key and click anywhere within the sentence to select the entire sentence. 

3) You can also select rectangular blocks of text in a Word document, similar to the marquee tool in Photoshop, and apply formatting to the selected area. Hold down the ALT key and drag your mouse to select any rectangular area