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.
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The GCF of 25, 100, and 750 is 25. Since 25 is a factor of 100 and 750, it is the GCF.
The greatest common factor of 10,040 and 60 is 20.
The Greatest Common Factor of 12, 60 is 12.
The greatest common factor of 468 , 60 = 12
The Greatest Common Factor (GCF) of 20, 24, and 60 is 4
The greatest common factor of 60 and 64 is 4.