Sieve of Eratosthenes I’ve never found a better way to show prime and composite numbers than using the Sieve of Eratosthenes. If you aren’t familiar... First list the whole numbers from 2-100. ( I made a poster board size listing the numbers and laminated it so I could use it over and over) Circle the first prime number, 2. Cross out all the numbers that have 2 as a factor. Circle the next prime number, 3. Cross out all the numbers that have 3 as a factor. Repeat the process for every prime number. The circled numbers are prime.
Finding Primes on a Hundreds Chart
K - Kindergarten
1 - First Grade
2 - Second Grade
3 - Third Grade
4 - Fourth Grade
5 - Fifth Grade
The grade level links above will take you to the Sunshine State Standards math expectations. Each expectation also includes a printable student activity.
1 - First Grade
2 - Second Grade
3 - Third Grade
4 - Fourth Grade
5 - Fifth Grade
The grade level links above will take you to the Sunshine State Standards math expectations. Each expectation also includes a printable student activity.
Math Resources
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FloridaMath.com aims to provide valuable math teaching resources for instructors and parents alike. Founded by a practicing third grade math teacher, it was constructed as a place for people to come together and share math teaching ideas. Since practicing instructors contribute to this website, the math teaching resources you will find here are both relevant and applicable.
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