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.
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60-1,2,3,4,5,6,10,12,15,20,30,and 60 350-1,2,5,7,10,14,25,35,50,70,175,and 350
What are the greatest common factors of 990 and 1540
The common factors are: 1, 2 The Greatest Common Factor (GCF) is: 2
The common factors are: 1, 2 The Greatest Common Factor (GCF) is: 2
There are no greatest common multiples only greatest common factors