Sieve of Eratosthenes

Materials: Handouts, number sheets

Step 1:

¨ Look at the patterns of multiples of 2, 3, 4, 5, and 6 in grids that are 4x4, 5x5, 6x6, . . ., and 12x12.

¨ Do Sieve of Eratosthenes worksheet actively read Investigation 4.8: The Sieve of Eratosthenes on pages 206-8.

¨ Actively read "Number Chart Primes and Multiples" from Mathematics for Elementary Teachers: An Activity Approach.

¨ Do Activity 2: A Sieve of Another Sort from Mathematics Activities for Elementary School Teachers: A Problem Solving Approach.

¨ Do problems 2, 4, 10, 13 and 17 on pages 212-3.

¨ Find the only prime triple and explain why there is only 1.

¨ Why is the Sieve of Eratosthenes called a sieve?