There is no Greatest Common Factor (GCF) for a single number. The Greatest Common Factor is the largest factor common to two or more numbers.
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The greatest common factor of 18 and 55 is 1.
The greatest common factor of 18 , 7 = 1
6, is the greatest common factor of 12 and 18.
The greatest (and actually the only) common factor of 18 and 31 is 1The factors of 18 are: 1, 2, 3, 6, 9, 18The factors of 31 are: 1, 31The GCF is 1.
It is 1