Example: 30 and 42
Factor them.
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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The GCF is 3.
The GCF of 18x^3 and 30x^5 is 6x^3
1, 2, 3, and 6 are all common factors of 6 and 12
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The greatest common factor of 9 and 48 is 3.