Explanation
To compare which among fractions has the highest value, they must be in the form where all their denominators are the same. Thus:
1/3 = 4/12
1/2 = 6/12
5/12
1/4 = 3/12
When comparing fractions with the same denominators, the fraction with the highest value is the one with the highest numerator. In this case, it is 6/12 or 1/2.