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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 = 3x17

P.F. of 85 = 5x17

Clearly, 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.

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8y ago

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More answers

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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Wiki User

13y ago
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The GCF= 17

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Wiki User

15y ago
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Q: What is the greatest common factor of 51 and 85?
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