Question

4. What is the greatest common factor of 42, 126, and 210 ?

F. 2
G. 6
H. 14
J. 21
K. 42

Answer 1

I would write prime factorization for each.
For example, 210=3(70)=3(7)(10)=3(7)(2)(5)
With factors in order 210=2(3)(5)(7)

Answer 2

write the prime factorizations for each number

Answer 3

so we can compare what factors they have in common

Answer 4

That's what I'm confused about. I'm very rusty on this stuff

Answer 5

divide by the lowest prime number then next prime number etc
i'll give you an example

prime factors of 18:-