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 Greatest Common Factor of 175 and 63 is 7.
The greatest common factor of 30 55 and 175 is 5.
The greatest common factor of 25 and 175 is 25.
The highest common factor of 175 and 200 is: 25
The greatest common factor of 50 and175 is 25.