20, 40, 60...
15 & 20 have an infinite number of Common Multiples; the first three are 60, 120 and 180.
10, 20 and 30.
4060, 8120, 12180.
20, 40, 60
1, 660, 5580
What are the first three common multiples of four and five
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.
20, 40, 60
20, 40, and 60.
10, 20, 30
10, 20, 30
140, 280, 420