first you make the denominators the same
you do that by finding the smallest number that they both can evenly multiply to
the smallest one is 12
so you convert your fractions to make the denominators 12
2/4 = 6/12
2/6 = 4/12
now whichever one has the greater numerator is the larger amount
6>4
the correct answer is 2/4 is bigger than 2/6