Prime Numbers

Summary
This lesson introduce prime and composite numbers. It gives the children an opportunity to use the sieve method to identify the prime numbers from 1 to 100.

Objectives
• to show the difference between prime and composite numbers;

• to show how the Sieve method can be used to identify prime numbers.

Suggested Grades
4th Grade
5th Grade
6th Grade

Excerpt
What is the difference between a prime number and a composite number?

? A prime number is a number with only two factors - itself and 1.
? A composite number has more than two factors.

What is a factor?

A factor is a number which divides evenly into another number.

Continued...