1, 3, 13, 39
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The Factors are: 2, 3, 6, 9, 18, 27
1,2,4,8
One solution would be to list the factors of the two numbers and find all the common factors. The greatest one would be the greatest common factor.
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.
There cannot be a greatest common factor (GCF) 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.