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"My favorite math lesson ever is based on a little tool called The Sieve of Eratosthenes. (Pronounced: Siv of Air-a-tos-thin-ease). It's rare that a single math lesson can be used again and again, with students of different ages, while still having an impact. Either it's too challenging for young students, or it's boring for older students. And your students will definitely let you know when you teach them a lesson they learned the year before. But here's why I think the Sieve of Eratosthenes is different. In some ways, it's just a glorified hundreds chart. But once you and your students start seeing the patterns in this hundreds chart, it gets really interesting. No matter how many patterns you find, there's always another layer to be uncovered."

Hundreds chart activity From ABCya!