The anser to that Q is 30.
60, 120 and 180
5, 10, 15... It helps!!
The first five multiples of 5 are 5, 10, 15, 20 and 25. For them to be common, they need to be compared to another set of multiples.
The common multiples of 10 and 16 are 80, 160, 240 and so on.
Any multiple of 10.
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.
20 is the smallest common multiple of 4, 5, and 10, and thus the first. Thus, the first three common multiples of 4, 5, and 10 are 20, 40 and 60.
10, 20, 30
10, 20, 30
20, 40, 60
30 60 90
30, 60, 90
10, 20, 30.
They are: 240, 480 and 720