1.6 and 18(36), multiples of 12 and 8(48)2.6: 6, 12, 18, 24, 30, 36, 42, 48. 90 ... common multiple: 30,60,90 Minimum common multiple: 303.8,24,30,18,20,7,40,80 (horizontally) 4. 12 days (because the minimum common multiple of 4 and 6 is/kloc-0) For 6.40 (because the minimum common multiple of 8 and 10 is 40), 7.24 minutes (because the minimum common multiple of 6 and 8 is 24), 8. 12 minutes later (because the minimum common multiple of 3 and 4 is 12), dad makes four laps and mom makes three laps, 9./kl.