15
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The least common multiple of 3 and 5 is 15. This, however is not a multiple of 2 so we must find the next common multiple of 3 and 5. This is 30. Since 30 is also a multiple of 2, 30 is therefore the least common multiple of 3, 5 and 2.
The word "least" is a superlative. What that means is that there cam be only one such number. Therefore 2, 3 and 5 have only one least common multiple, not least common multiples! LCM(2, 3, 5) = 30.
The highest common multiple of two numbers is their least common multiple (LCM). The LCM of 3 and 5 is found by multiplying the two numbers and dividing by their greatest common divisor (GCD). In this case, the LCM of 3 and 5 is 15, as 3 * 5 / 1 = 15.
60
The LCM of 3, 5, and 18 is 90