To find the greatest common factor of two numbers, you first need to factorise those numbers. In this case:
72=3x3x2x2x2
91=7x13
The next step would be to find any common factors. As there are none, this means that the greatest common factor of 72 and 91 is 1.
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Greatest common factor for 52 and 91 is 13.
The GCF is 1.
The Greatest Common Factor (GCF) is: 13
7
The GCF of 91 and 137 is 1.