The factors of 91 are:
1, 7, 13, 91
The factors of 156 are:
1, 2, 3, 4, 6, 12, 13, 26, 39, 52, 78, 156
The common factors are:
1, 13
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13 is the highest common factor of 78, 91 and 156.
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.
1
The prime factors are: 39 = 3 * 13 143 = 11 * 13 156 = 2 * 2 * 3 * 13 So the greatest common factor is 13.
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