# 1.1 Identifying Prime and Composite Numbers

This is the first section of Chapter 1: Number Relationships. The objective here was to help students understand the difference between prime and composite numbers, and to find quick ways to determine whether a number is prime or composite.

## Introduction to Identifying Prime and Composite Numbers

Defining *prime number* and *composite number*.

## First Examples

Determining whether a number is prime or composite, and finding numbers that can be multiplied together to produce that number.

## More Examples

Using Venn diagrams to determine whether numbers are prime or composite. Dealing with exceptions like 1, 0 and negative numbers.

## Experiment: Finding a More Efficient Way to Determine Whether a Number is Prime or Composite

In this activity, students tested a couple different numbers to see if they could figure out a pattern to why numbers are prime or composite. Their objective was to find out if we need to check all the possible factors of a number, or if there is a shortcut.

This is the conclusion that Mr. Barr's homeroom reached.

This is the conclusion that Mrs. Kelley's homeroom reached.

## Support Questions

The support questions we chose for this section were: #5, 6, 7, 8, 10, 14.