4th Grade Math 5.5 PART 2, Prime & Composite Numbers, Sieve of Eratosthenes

PART 2 of lesson 5.5. We now know that a prime number is a whole number greater than 1 that has exactly two factors, 1 and itself. A composite number is a whole number greater than 1 that has more than two factors. Eratosthenes of Cyrene was a Greek mathematician who lived more than 2,000 years ago. He invented a method of finding prime numbers, which is now called the Sieve of Eratosthenes. This is a step-by-step explanation of how to use a 100 chart to cross out or shade in all the numbers that are composite or not prime. You can find a 100 chart in the Joann's School Facebook page image section to print, you can find one online on your own, or you can make a 100 chart.

4th Grade Math 5.5 PART 1, Prime & Composite Numbers https://youtu.be/YkDL4Kl_qWY

4th Grade Math 5.4, Factors & Multiples https://youtu.be/7zMoZSc47A4

4th Grade Math Playlist https://www.youtube.com/playlist?list=PLKi4WTp6PRGX7RhcxctRibNb7V091JZfn

I'm using the Houghton Mifflin Go Math! 2015 copyright textbook for this playlist.

You can practice online using the textbook's website https://www.gomathacademy.com/

YouTube rating for JoAnn's School videos: L0 - No strong language N0 - No nudity S0 - No sexual situations V0 - Not violent or disturbing D0 - No drug reference or content F0 - No flashing lights content

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https://www.youtube.com/channel/UCAZKtYcE5Jgd6hVL-RHv6Vw ... https://www.youtube.com/watch?v=N1CvDFuTlTY