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The tree finds the prime factorization. The prime factorization finds the GCF.

Example: 30 and 42.

30

15,2

5,3,2

42

21,2

7,3,2

2 x 3 x 5 = 30

2 x 3 x 7 = 42

Select the common factors.

2 x 3 = 6, the GCF

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