There cannot be a greatest common factor of just one number. To be common there need to be at least two numbers. If you find all the factors of two or more numbers, and you find some factors are the same ("common"), then the largest of those common factors is the Greatest Common Factor.
The greatest common factor of 42 and 12 is 6.
The greatest common factor of 42 and 66 is 6.6
The Greatest Common Factor (GCF) is: 6The greatest common factor of 42 and 102 is 6.
The Greatest Common Factor of 24 and 42 is 6.
The greatest common factor of 13 and 42 is 1.
The greatest common factor of 42 and 196 is 14.
The greatest common factor of 16 and 42 is 2.
The greatest common factor of 12 , 42 = 6
Since 3 is a factor of 42, it is automatically the GCF.
the greatest common factor of 42 and 82 is 2
The GCF of 42 and 58 is 2.
The Greatest Common Factor of 42, 56, 98: 14