15 - 3, 6, 9, 12,___
56 - 52, 53, 54, 55, ___
28 - 24, 25, 26, 27, ___
36 - 4, 9, 16, 25, ___
112 - 103, 106, 109, ____
50 - 90, 80, 70, 60, ___
60 - 20, 30, 40, 50, ___
75 - 15, 30, 45, 60, __
18 - 2, 6, 10, 14, ___