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Sieve of Eratosthenes

Add/Subtract

Sieve of Eratosthenes

Grade 7

Created by:

Math & Movement

Estimated Activity Time:

Standard:

Operations and Algebraic Thinking, KNOWRE Grade 4, Chapter 6 Fraction Concepts

Concept(s):

Prime numbers

Activity Instructions

A prime number is a natural number greater than one and only has two factors, one and itself. Have your students use the Sieve of Eratosthenes to find all the prime numbers up to 100.

Have a student stand on the number one. One is special – it is neither prime nor composite.

Next, have a student step to the number two. This number is prime. Skip count by twos, covering all the multiples of two with construction paper. Have a student move to the next number that is not covered with construction paper (in this case, it will be three). Skip count by 3s and cover all the multiples of 3 with construction paper. Continue the same pattern until 100. The numbers not covered in construction paper are the prime numbers.

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