You need at least two numbers to find a GCF.
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The common factors of 52 and 91 are: 1 and 13
91
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.
It is 7
The Highest Common Factor is: 8