The two common multiples of three and five are: 15 and 30 ^-^
30
The LCM is: 30
60 and 120
Since 30 is a multiple of 6, all multiples of 30 are common.
A single number cannot have common multiples, until you are comparing it with one or more other numbers.
The multiples of 3 up to 30 are: 3,6,9,12,15,18,21,24,27,30.The multiples of 5 up to 30 are: 5,10,15,20,25,30.The only common multiples are 15 and 30.The LCM is: 30
One common multiple of 15 and 30 is 60. Want another? 120
The common multiples of 4 and 5 are 20, 40, 60, 80,100 and so onGet the least common multiple of the two. All other common multiples are multiples of this least common multiple.Any multiple of 20.
30 and 60
15 and 30
They are: 30 and 60