Many of the worksheets in this section provide you with a plotted graph or coordinates to plot. Students are asked if the relation is a function. Students will use charts, coordinate grids, ordered pair sets (relations), and more. These worksheets introduce the definition of a function, and how to determine if an expression is a function. You will also learn how to identify, solve, and graph different kinds of functions.

# Print Definition of a Function Worksheets

#### Click the buttons to print each worksheet and associated answer key.

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Definition of a Function Lesson

This worksheet explains the concept of a function. A sample problem is solved, and two practice problems are provided.

## Practice Worksheet

Students will study the information provided in each problem and determine whether or not it is a function. Ten problems are provided.

## Practice Worksheet

Students will study the information provided in each problem and determine whether or not it is a function. Six practice problems are provided.

## Is It a Function Quiz

Students will demonstrate their proficiency determining whether or not the information provided is a function. Ten problems are provided.

## Skills Check

Students will determine if they get the concept in a series of exercises. Three problems are provided, and space is included for students to copy the correct answer when given.

### How Are Math Functions Used in the Real World?

We all know what math functions are. But often, there is a question that pops in our head, which is, how do you use math functions in the real world. It's no brainer; there are lots of applications for math functions! One of the biggest uses of functions is used when we use vending machines, or stamp machines, or any machine for that matter. When you press, you are giving it a specific command to follow, that is carried out with the help of a math function. Another application is measurement tools. On tools such as thermometers, the scales are different from those we use in our daily lives. And when we are converting such scales, we are actually using math functions!