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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.

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12y ago
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11y ago

The GCF is 7.

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Q: What is the greatest common factor of 91 and 77?
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The greatest common factor of 21, 77, and 91 is 7.How to find the greatest common factor of 21, 77, and 91:One way to determine the greatest common factor is to find all the factors of the numbers and compare them.The factors of 21 are 1, 3, 7, and 21.The factors of 77 are 1, 7, 11, and 77.The factors of 91 are 1, 7, 13, and 91.The common factors are 1 and 7. Therefore, the greatest common factor is 7.The greatest common factor can also be calculated by identifying the common prime factors and multiplying them together.The prime factors of 21 are 3 and 7.The prime factors of 77 are 7 and 11.The prime factors of 91 are 7 and 13.The only prime factor in common is 7, so the greatest common factor is 7.The GCF is 7.


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