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To find the greatest common factor of two numbers, they first need to be split into their prime factors. For 85 and 51 this is done as follows:

51 = 17x3

85 = 17x5

The next step is to identify any common factors. In this case, both numbers have 17 as a prime factor. This is the only common factor, and thus the greatest common factor of 85 and 51 is 17.

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Q: What is the greatest common factor of 85 and 51?

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The greatest number which divides both 51 and 85 is 17. So, greatest common factor is 17.Alternate method:P.F. of 51 = 3x17P.F. of 85 = 5x17Clearly, from the P.F. of both numbers 17 is the greatest common factor.The GCF is 17.51 and 85's highest common factor is 17.

The greatest common factor of 85 and 255 is 85.

1

The Greatest Common Factor (GCF) is: 5

The GCF of 35 and 85 is 5

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It is 17

It is: 17

The greatest number which divides both 51 and 85 is 17. So, greatest common factor is 17.Alternate method:P.F. of 51 = 3x17P.F. of 85 = 5x17Clearly, from the P.F. of both numbers 17 is the greatest common factor.The GCF is 17.51 and 85's highest common factor is 17.

The Greatest Common Factor is 17.

No, it is 17.

17

The GCF is 17.

Factor them. 3 x 17 = 51 5 x 17 = 85 Select the common factor. The GCF is 17.

The GCF is 17.

The GCF is 17.

The GCF is 17.

GCF(39, 51, 85) = 1. The numbers are coprime.

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