13 is a prime so its only factors are 1 and 13. 13 is NOT a factor of 9, so the only common factors of the two numbers is 1.
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9 and 13
There are no COMMON factors]between '9' & '25'. '9' has the factors os 3, & 9. '25 has the factors of 5, & 25/
Common factors of 9 and 18 are: 1, 3, and 9.
Divide both parts by 9, as they are common factors. That gives you 8 and 13.
Factors of 91: 1, 7, 13, 91Factors of 117: 1, 3, 9, 13, 39, 117GCF (91, 117) = 13