well to find a fourth of 12 you need to divide 12 by 4
12÷4=3
and to find a third of 12 you need to divide 12 by 3
12÷3=4
so now you need to figure out which is greater 4 or 3?
(that should be easy but if not the answer is 4 so 1/3 of 12 is greater than 1/4 of 12)