5. Using Functions in Formulas


A function is a predefined formula for making a specific kind of calculation. Functions make it quicker and easier to write formulas.

For example, say you need to add up a column of numbers like the one in Figure 1. It’s perfectly acceptable to write a formula using cell references separated by the addition operator (+) like this:


Figure 1. Using the SUM function makes it easier to add up a column of numbers.


But rather than enter a lengthy formula, you can use the SUM function to add up the same numbers like this:


The SUM function is only one of over 300 functions ...

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