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Sieve of Eratosthenes Activity

When my husband (formerly an Australian maths teacher) and I were dating, he wrote a blog post where he shared how he used the Sieve of Eratosthenes with students.

I was blown away by this post because I’d used this activity with students before but never exactly like the way he explained. Shaun didn’t just have students mark out a number once. He had them color-code their work and mark out numbers each time they were a multiple of one of the prime numbers.

My math concepts students are currently working on prime vs. composite numbers, so I finally got to try this activity out for myself with this multi-colored tweak. It was awesome! I also appreciated that Shaun has his template extend to 150 instead of the standard 100 often used in math classes.

Sieve of Eratosthenes Activity

More Activities for Teaching Prime and Composite Numbers


Monday 22nd of January 2018

Any chance I could get a copy of the Slope Art Project you referred to in #1? If not no worries, I just like to try new projects sometimes. Sincerely,



Saturday 20th of January 2018

THank you for that hundred chart! I *promise* you some of those ninth graders will really benefit. (Thanks for getting one that just looks like a number chart... no puppies...) I'm working on a geogebra exercise for practice just putting numbers on a number line to get more fluent with associating numbers with what they mean...

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