How do 3/6 and 7/15 compare? Step 1: Find a common denominator that is compatible with both fractions' denominators. Step 2: Using the denominator from Step 1, re-express the fractions in an equivalent form. The equivalent fraction for Three-sixths will have a numerator of . The equivalent fraction for Seven-fifteenths will have a numerator of . Step 3: Compare the two numerators, since they now have the same denominator. Three-sixths Seven-fifteenths