its 13 but to get it u can do factor trees that's how i do it
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The GCF is 13.
The GCF is 13.
The GCF is: 13
It's 13 because 65: 1, 5, 13, 65 91: 1, 7, 13, 91
1. 13 is a prime number, so it has only 1 and 13 as its factors, and 142 can't be divided by 13, so the GCF here is 1.