4 is the GCF of 52 and 72 because 52 = 4 times 13 and 4 divides 72 but 13 does not.
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The greatest common factor of 52 and 80 is 4.
The GCF is 4.
The greatest common factor of 7248 , 72 = 24
The Greatest Common Factor of 16, 48, 72: 8
The greatest factor is 72 which is a factor of 72 (though not of 60).