You need at least two numbers to find the LCM
LCM(16, 18, 12) = 432.
The three numbers must be 12, 16 and 18. LCM(12, 16, 18) = 144
The LCM of 12, 16, 18, and 36 is 144
It is not possible to give a sensible answer to this question. The least common multiple (LCM) refers to a multiple that is COMMON to two or more numbers. You have only one number in the question!
The LCM of 16 and 18 is 144.
The LCM of 18 and 16 is 144.
For the numbers 18, 16, 15, 12, 10 the LCM is: 720
The smallest number is LCM(12, 16, 18) = 144
The LCM is 36.
The LCM is 5040.
The LCM is 720.