Answer:
GCF: 2
Explanation:
there are a lot of ways to find the greatest common factor of two numbers
so, first find all the factors that give u the solution that u have
18= 18 times 1, 2 times 9 and 3 times 6
the factors of 18 is 1, 2, 3, 6, 9, 18
542: 542 times 1 and 2 times 271
the factors of 542 are 1,2,271,542
if we see the factors of 18 and 542, the only two things that are common are 2 and 1 and 2 is greater than 1, so 2 is the GCF