Pluralism
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That's known as the least common multiple, or LCM.
They were known to the ancient civilisations. Irrational numbers are supposed to have been discovered by Hippassus of Metapontum, a member of the Pythagorean school in ancient Greece (5th Century BC).
The least common multiple of two or more number is the smallest multiple. For example the least common multiple of 2 and 3 is 6. Another common multiple of 2 and 3 is 12. Another one is 24. Both 2 and 3 will go into 24 several times. You can start dividing and see how many times.
A common multiple is a number that two or more other numbers can both go into. For example, a common multiple of 2, 4, and 6 would be 12.Not sure what you mean by a "comman" multiple, but a commonmultiple of a set of numbers is a number that is a multiple of each number in the set. That is, it is in the multiplication table of each of the numbers in the set. Note, though, that for this purpose, the multiplication tables do not stop at 10 times or 12 times.All numbers have multiples. Some numbers have some of the same multiples as other numbers. These are known as common multiples.18 is a multiple of 6.18 is a multiple of 9.18 is a common multiple of 6 and 9.All numbers have multiples. Some numbers have the same multiples as other numbers. These are called "common multiples."12 is a multiple of 3.12 is a multiple of 4.12 is a common multiple of 3 and 4.
Those are known as "common multiples". The smallest POSITIVE of these common multiples is called the "least common multiple".