The GCF is 9.
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The greatest common factor of 91 and 126 is 7.
The greatest common factor of 65 and 99 is 1.
It is not possible to give a sensible answer to this question. The highest common factor (HCF) refers to a factor that is COMMON to two or more numbers. You have only one number in the question!
The greatest common factor of 4 and 99 is 1.
The GCF of 75 and 99 is 3.