# Introduction to Functions

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## Objective

SWBAT define a function using standard mathematical terminology.

#### Big Idea

What is a function? Inputs and outputs - how do you know if something is a function?

## Warm-up

10 minutes

Each day, students complete a warm-up that usually consists of spiraling the previous day's material, in addition to older material.  Warm-up problems also sometimes extend lessons that students have encountered before to more unfamiliar contexts. In this case, the warm-up has two spiraled review, straightforward question giving kids practice in evaluating expressions.

Number 3 is a more challenging application problem. I will insert challenges at the end of the warmup over the next few days.  For this one, I like to make a table that identifies the first integer as x, and then define the other two integers as x + 1 and x + 1 + 1 (I draw an arrow with "+1" on it from these two columns).  Then, I always say, "To figure out one unknown, what do we need?  (An equation.)"

40 minutes

10 minutes

## Homework

15 minutes

The homework includes questions related to this lesson, as well as spiraled review.  I also provide answers to the problems on page 2.
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