Question

For which pair of numbers is the greatest common factor 8 ?

Answer 1

It's 56 and 72 because 56/8=7 and 72/8=9

Answer 2

The pairs are 2 and 4
7 and 15
32 and 64
56 and 72

factor each

2 and 4
nope, they aren't even equal to 8

7 and 15
nope, their GCF is 1

32 and 64, nope, their GCF is 32

56 and 72
56=2*2*2*7
72=2*2*2*3*3
gcf=2*2*2=8




answer is 56 and 72