Lesson on Prime and Composite Numbers Georgia Louviere



Introduction
In this activity you will identify the first 25 prime numbers by using the "sieve" method which was first used by an Ancient Greek mathematician, Eratosthenes. You will also be able to explain why the number one is neither prime nor composite. In addition, you will be able to demonstrate why the number "2" is the only even prime.



What You Will Need:

Student Activity 1
100 Chart
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Procedure A:
  1. Write the rules of divisibility for the first four prime numbers:
    • A number is divisible by 2 if ...
    • A number is divisible by 3 if ...
    • A number is divisible by 5 if ...
    • A number is divisible by 7 if ...
  2. Shade in the number "1" square with the red map pencil. The number "1" is neither prime nor composite. It is special or unique. Do you know why?




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