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Prime and Composite Numbers

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Prime Number 4757 A Prime Number is a whole number greater than 1 that has exactly two factors, 1 and itself. Which number is prime?

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Composite Number 20 Factors: 1, 2, 4, 5, 10, 20 55 Factors: 1, 5, 11, 55 A composite number is a whole number greater than one that has more than two factors

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108 912 3343 332 3 Prime Factorization Expressing a composite number as a product of prime numbers Rewrite as: Method 1

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Method 2: An easy way of keeping track of the factorization is to do upside-down division. It looks like this: The nice thing about this upside-down division is that, when you're done, the prime factorization is the product of all the numbers around the outside. The factors are circled in red above.

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Try prime factorization on these composite numbers!! 6436 144972

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Lesson 9 Power Up BPage 54 Prime Numbers. A counting number greater than 1, has exactly two factors (the number itself and 1) 2, 3, 5, 7, 11, 13, 17,

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