The Least Common Multiple (or Lowest Common Multiple) of a group of numbers, called the LCM, is the smallest number that's a multiple of all the numbers. For instance, the LCM of 16 and 20 is 80; 80 is the smallest number that's both a multiple of 16 and a multiple of 20.
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common multiples
Those are known as "common multiples". The smallest POSITIVE of these common multiples is called the "least common multiple".
Multiples. Numbers have an infinite number of multiples.
There is an infinite number of common multiples for 21 and 40. A common multiple of any two or more numbers is any number into which each of two or more numbers can be divided evenly (zero remainder).
The multiples of 12 are 12, 24, 36, 48 and keep on adding 12.The multiples of 16 are 16, 32, 48, 64 and keep on adding 16.If you look at the two of these, you can see there is a least common multiple. A least common multiple is the smallest multiple that are shared by two (or more) numbers. If you list the multiples down, you can see 48 are in both, so 48 is the least common multiple for 12 and 16.