10112 = 1×23 + 0×22 + 1×21 + 1×20 = 8 + 0 + 2 + 1 = 11
10012 = 1×23 + 0×22 + 0×21 + 1×20 = 8 + 0 + 0 + 1 = 9
11112 = 1×23 + 1×22 + 1×21 + 1×20 = 8 + 4 + 2 + 1 = 15