Erosthene's Sieve

This would be a beginning lesson on prime numbers. Have paper hundreds boards for the students to color as you show the multiplies on the Smartboard. You could have one student come up and touch the numbers as you count first by 2s, then by 3s, then by 4s, etc. Do not touch the first number you say as you count the multiplies. For example, do not touch the 2, 3, 5, etc. Do not touch the 1 as one is not considered a prime. As you touch each multiple have the students color it on their chart. When you finish, you should have the prime numbers not colored.