The Sieve of Eratosthenes

This The Sieve of Eratosthenes lesson plan also includes:

Employing an over 2,000 year old method for determining prime numbers, young mathematicians deepen their number sense in a lesson on factors and multiples. Using the included 100 chart and following the given steps, students systematically cross out composite numbers until they are left with all the prime two-digit numbers.

158 Views 109 Downloads
Instructional Ideas

  • Begin the lesson by briefly sharing information about the ancient Greek scholar Eratosthenes who originally developed the procedure used in this lesson
  • Take time for students to discuss the patterns they observe with a partner, small group, or the entire class
Pros

  • Offers suggestions for adapting and extending the lesson to meet the needs of all learners
  • Includes questions for guiding a discussion about students' findings
  • Worksheet asks learners to write about three observations they made during the activity
Cons

  • None
Common Core