The GCF is 1.
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The GCF is 7.
The GCF is 7.
The GCF is 7.
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.
To identify the GCF of 91 and 78, you first need to break these down into their prime factors: 91 = 7x13 78 = 2x3x13 The next step is to identify any common prime factors. In this case, both numbers have 13 as a prime factor. Thus the greatest common factor of 91 and 78 is 13.