The prime factors of 91 are 7 and 13. 13 is a Prime number so only has 1 and itself as factors. Therefore the only common factors for 13 and 91 are 1 and 13.
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The GCF is 13.52 and 91's highest common factor is 13.
39/91 Has '13' as a common factor, so cancel down (reduce) by '13' Hence 39/91 = 3/7
Common factor is 7 so 13/16
1, 7, 13, 91
The greatest common factor of the numbers 35, 84 and 91 is 7.