We can't tell what those numbers are without spaces between them. Eliminate the ones that aren't multiples of 7, like 271, and proceed from there or re-submit the question.
Any consecutive even numbers have a GCF of 2.
The numbers are 135 and 136.
The numbers 2 and 30 have a GCF of 2 and an LCM of 30.
The greatest common factor of the numbers 48 and 42 is 6.The GCF is: 6
2 numbers have a gcf of 3 = 3 & 6, 6 &9,...
The GCF is 2.
The GCF of 18, 20, and 26 is 2. The GCF of a set of numbers can't be any larger than the smallest difference between the numbers. The smallest difference within this set of numbers is 2. Since all of the numbers in the set are even, 2 is the greatest common factor.
269 + 2
If one of the numbers is a multiple of the other, the smaller number is the GCF. If the two numbers are prime numbers, the GCF is 1. If the numbers are consecutive, the GCF is 1. If the numbers are consecutive even numbers, the GCF is 2.
The GCF is 2.
The GCF is 1.
The GCF is 2.