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Seive of Eratosthenes

September 26, 2011 by Tracy Watanabe · No Comments · Learning, Math

 

I will be telling you how to figure out how to do the Sieve of Eratosthenes and that will help you to figure out the prime and composite numbers in between 1 and a 100.

The first step is to make a circle around the number 2.

The second step is to start on the number 4 skip count by 2s till 100 and make an x on every number.

The third step is to circle the number three.

The forth step is to start on the number 6 skip count by 3s till 100 and make an x on every number.

The fifth step is to circle the number 5.

The sixth step is to start on the number 10 skip count by 5s till 100 and make an x on every number

The seventh step is to circle the number 7.

The eighth step is to start on the number 14 skip count by 7s till 100 and make an x on every number.

If you do this. These will be your prime numbers: 2, 3, 5, 7, 11, 13, 17, 19, 23, 29, 31, 37, 41, 43, 47, 53, 59, 61, 71, 73, 79, 83, 89, and 97.

Here’s a link that will bring you to a Seive of Eratosthenes that goes from 2 to 400.

Did this help you on prime and composite numbers?

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