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13 is the highest common factor of 78, 91 and 156.
The GCF is 98.
Greatest common factor of 78 and 286 is 26.
The GCF is 13.
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.