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.
All the common multiples of a set of numbers are the multiples of their lowest common multiple: lcm(5, 8, 10) = 40 → first three common multiples are 40, 80, 120
60,120,180
10, 20, 30.
The anser to that Q is 30.
30 60 90
10, 20, 30.
They are: 240, 480 and 720
They are: 60 120 and 180
20 30 40
90, 180, 270
30, 60 and 90.