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Factor Tree’s and Prime Factorization Section 4-2

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Bell Ringer # Prime or composite? 1) 19 2) 82 3) 57 4) 85 5) 101 6) 121

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Vocabulary Factor: Whole numbers that are multiplied to find a product are called factors. Prime Factorization: The prime factorization of a number is that number written as a product of prime factors.

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Finding factors To find the factors of a number. Simply list the two numbers that when multiplied together, equal that number

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Example 1 Find all the factors of 18 1 * 18 = 18 2 * 9 = 18 3 * 6 = 18 So the factors of 18 are 1, 2, 3, 6, 9, 18.

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Example 2 Find all the factors of 13 1 * 13 = 13 Nothing else gets you 13, so the factors of 13 are just 1 and 13 because 13 is a prime number.

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Example 3 Find all the factors of 24

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On your own Find all the factors of 16.

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Factor Trees Factor trees are something we use to help us find the prime factorization of a number.

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Example 4 36 36

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Example 5 64 64

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Example 6 54 54

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Lesson quiz Find all the factors of 21 Find the prime factorization of 24

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