Any multiple of 90.
There are infinite common multiples for a set of numbers. So it is not possible to write down all the common multiples. Some common multiples of 15, 30 and 45 are 90, 180, 270, 360,... There is another way to find common multiples: Write the multiples of LCM(15, 30, 45). Actually the common multiples of a set of numbers are the multiples of their LCM. LCM of 15, 30 and 45 is 90. And the multiples of 90 are 90, 180, 270, 360, 450, 540,... which are the common multiples of 15, 30 and 45.
Any multiple of 90.
45, 90, 135
45 and 90
The common multiples of 3 and 15 from 1 to 100 are 15, 30, 45, 60, 75, and 90.
The common multiples of 3 and 15 from 1 to 100 are 15, 30, 45, 60, 75, 90
15, 30, 45, 60, 75, 90
15, 30, 45, 60, 75, 90.
15, 30, 45, 60, 75, 90
Since the lowest common multiple of 3 and 5 is 15, the common multiples of 3 and 5 are the multiples of 15: 30, 45, 60, 75, 90, etc...
15, 30, 45, 60, 75, 90
15, 30, 45, 60, 75, 90