Grade 4 Math 5.5, What are Prime and Composite Numbers

An explanation of how to tell if a number is a prime number or a composite number. Who was Erastosthenes? What is the Sieve of Erastosthenes? How can it help...

JoAnn's School15.6K views4:14

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An explanation of how to tell if a number is a prime number or a composite number. Who was Erastosthenes? What is the Sieve of Erastosthenes? How can it help me find prime numbers? #50 Sorry about the shakiness. I'm disabled and have a bad arm. YouTube anti-shake editing option didn't work well on this video.

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15.6K

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4:14

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Mar 22, 2016

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