4060, 8120, 12180.
20, 40, 60...
10, 20 and 30.
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.
The first three multiples of 10 are 10, 20 and 30. Since numbers don't stop, there are no last three.
20, 40, 60
20, 40, and 60.
10, 20, 30
10, 20, 30
140, 280, 420