140, 280, 420
60,120, 180. 15 x 4 = 60 20 x 3 = 60 15 x 8 = 120 20 x 6= 120 15 x 12 = 180 20 x 9 = 180
10, 20, 30 The common multiples of 5 and 10 are multiples of their lowest common multiple. The lcm of 5 and 10, is 10. Thus the first three common multiples are 10, 20, 30.
1, 660, 5580
20, 40, 60
20, 40, and 60.
10, 20, 30
10, 20, 30
140, 280, 420
40, 80 & 120.
They are: 180, 360 and 540
20, 40, 60.
20, 40 and 60