90 is.
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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.
The LCM of 15 30 and 60 is 60.
The least common multiple of the numbers 15, 9 and 6 is 90.
The LCM of these numbers is 900 . LCM is Least common multiple.
LCM(15. 75, 90) = 450.