MATH: Divisibility Rules, Prime and Composite Numbers, and Prime Factorization

Posted on December 16, 2011. Filed under: Math | Tags: , , , |

Today, we reviewed the Divisibility Rules that you probably remember from last year:

20111216-081003.jpg

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We also reviewed Prime and Composite Numbers:

*Prime Numbers are whole numbers that only have two factors, 1 and itself. (examples, 2, 7, 13)
2 is the lowest prime number.

*Composite Numbers are whole numbers that have more than two factors.

*The number 1 is not prime or composite. Neither is 0.

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Then, we took a look at Prime Factorization. Prime Factorization is when we write numbers as the product of prime numbers.

Here are a few examples from class:

20111216-082446.jpg

Finally, this is a video from the Khan Academy that explains prime factorization and gives you more examples:

Prime Factorization

~Ms. Morris

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