# Function Tables

A function is a rule which maps each element of the domain to exactly one element in the range. A function can be described by many ways like with a mapping diagram, by a set of ordered pairs, by an equation, with function notation or with a function table. Each of this method is used depending upon the need.

A function table is a numerical representation of the function and is especially useful in describing the relationship in experimental data. Let us learn how to identify the functions represented by the function table by observing the pattern in the values, or how to write the function rule which the table represents.