Without specifying the GCF, it could be anything. 9 and 12 have a GCF of 3.
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15 and 16
The greatest common factor of the numbers 16 and 56 is 8.
The greatest common factor of the numbers 323 and 391 is 17.
The greatest common factor of two or more prime numbers is 1.
is known as the greatest common factor, or GCF.