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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All I did was make a factor tree. The GCF (Greatest Common Factor) is 5. :)
12 6,2 3,2,2 42 21,2 7,3,2 2 x 3 = 6, the GCF
You Do a Factor Tree which is very simple. But the answer is 12
36 18,2 9,2,2 3,3,2,2 54 27,2 9,3,2 3,3,3,2 2 x 3 x 3 = 18, the GCF
4515,35,3,35427,29,3,23,3,3,23 x 3 x 5 = 452 x 3 x 3 x 3 = 543 x 3 = 9, the GCF