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How do you find the GCF by doing a factor tree?

Updated: 8/19/2019
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11y ago

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Factor trees are ways of finding the prime factorization of given numbers.

Example: 30 and 42

30

15,2

5,3,2

42

21,2

7,3,2

Select the common factors. 2 x 3 = 6, the GCF.

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11y ago
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Q: How do you find the GCF by doing a factor tree?
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