They are all multiples.
There is no "most common multiple". To find all common multiples, you start by finding the least common multiple. All other common multiples are multiples of this least common multiple.
The common multiples of 9 and 16 are 144, 288, 432 and so on.
Use some method which you probably already learned, to find the least common multiple. All the other common multiples are multiples of this least common multiple, so you can multiply the least common multiple by 2, by 3, by 4, etc., to get additional common multiples.
There are infinitely many common multiples of 6 and 8. The least common multiple of them is 24. After that, all of the multiples of 24 (i.e., 48, 72, 96, etc.) are the common multiples of 6 and 8.
Least common multiple is 88. Other multiples are 176, 264, 352, etc. and all integer multiples of 88.
a least common multiple has to be between 2 numbers, not just 1.
The least common multiple of the numbers 18 and 28 is 252.
All numbers have multiples. Some numbers have some of the same multiples as other numbers. These are known as common multiples. On the list of common multiples, one number is the smallest. This is the least common multiple.
Short answer: There is none. There is not a least common multiple of a single number, such as 54, because there cannot be any form of common multiple without two or more numbers to compare. Common multiples are multiples that the numbers being compared have in common. The least common multiple is the smallest multiple that all the numbers being compared have in common. Thus, since there are not two or more numbers to compare, there is not a least common multiple. The lowest common multiple of 54 depends upon the other number(s) with which it has COMMON multiples and is one of the multiples of 54. The common multiples of 54 depends upon the other numbers with which 54 has COMMON multiples and are the multiples of the least common multiples between 54 and the other number(s).
You need at least two numbers to find an LCM.
You need at least two numbers to find an LCM.