Any multiple of 9 is a common multiple of 3 and 9.
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The common multiples of an set of numbers are the multiples of their lowest common multiple. lcm(7, 8, 9) = 504 → the first 3 common multiples of 7, 8, 9 are 504, 1008, 1512.
They are the first three multiples of their lowest common multiple: 36, 72, 108.
The lowest common multiple is 36
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The biggest common divisor of 9 and 15 is 3. To find the least common multiples of 9 an 15 you should multiply these numbers and divide the result by their biggest common divisor. 9x15/3=45