1 and 3 are the only numbers that have common multiples of 15 and 18.
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The least common multiple of 69 , 15 , 18 = 2,070
The least common multiple (LCM) is often also called the lowest common multiple or smallest common multiple. Keep in mind that these different terms all refer to the same thing: the smallest positive integer which is a multiple of two or more numbers.The least common multiple of 18, 20, and 30 is 180.
There is no highest common multiple. Once you get a common multiple - for example, multiplying 18 x 57, or using prime factorization to get the smallest common multiple - you can multiply it by 2, by 3, by 4, etc. and get ever-larger common multiples.
LCM(15, 18, 30) = 90
360