The prime factors for 66, 30, 60, and 48 are:
66 = 2 x 3 x 11
30 = 2 x 3 x 5
60 = 2 x 2 x 3 x 5
48 = 2 x 2 x 2 x 2 x 3
The factors that all numbers have in common are 2 x 3, so 6 is the GCF of 66, 30, 60, and 48.
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The Greatest Common Factor of 165, 48, 60: 3
The GCF is 8.
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The greatest common factor of 20 and 48 is 4
Since 16 is a factor of 48, it is automatically the GCF.