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A function is a predefined formula that performs calculations using specific values in a particular order. Excel includes many functions that can be used to quickly find the sum, average,count, maximum value, and minimum value for a certain range. In order to use functions correctly, you'll need to understand the different parts of a function and how to create arguments to calculate values and cell references. There are different types of a function one of the most important being syntax.

In this lesson you learn how to work with functions and how to create them. There are many tools in the function library that can be very useful. There are also commands that can be used to help you out with how the functions work.  Inserting functions allows you to search for  functions using keywords. This can be very helpful when a worksheet has lots of data and it can be hard to read.