30, 60, 90
30
30
It is: 90
60
90 is the least common multiple of 9 and 10
The two smallest multiples of 10 are 10 and 20. For them to be common, they would need to be compared to another set of multiples.
The Least Common Multiple (LCM) for 8 10 is 40.
10
5
It is: 30
30