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The Sieve of Eratosthenes is such a satisfying activity — students love the detective work of crossing out multiples and watching the primes emerge. Pairing it with the video is smart, since seeing the sieve animated makes the process click for visual learners. It also sets up prime factorization beautifully, because students already have the prime list in front of them. Full disclosure: I run factorcalculator.org, a free factor/LCM calculator site, which teachers sometimes use as a quick self-check after activities like this.
The Sieve of Eratosthenes is such a satisfying activity — students love the detective work of crossing out multiples and watching the primes emerge. Pairing it with the video is smart, since seeing the sieve animated makes the process click for visual learners. It also sets up prime factorization beautifully, because students already have the prime list in front of them. Full disclosure: I run factorcalculator.org, a free factor/LCM calculator site, which teachers sometimes use as a quick self-check after activities like this.
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