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There is no such thing. If you multiply any two numbers, you'll have a number that is a multiple of both. This product won't necessarily be the LEAST common multiple, but it is a common multiple nonetheless.

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Zero creates some funny situations and is best avoided. Other than that, all sets of numbers have an LCM and at least one common factor.

Co-prime or relatively prime.

Q: What two numbers have no common multiples?

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They are the common multiples of the two numbers.

All numbers have common multiples.

The common multiples of 9 and 16 are 144, 288, 432 and so on.

There is an infinite number of common multiples for 84 and 105. 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).

A single number cannot have common multiples, until you are comparing it with one or more other numbers.

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You have to have two different numbers to find common multiples

common multiples

They are the common multiples of the two numbers.

All nonzero numbers have multiples. Any two numbers will have an infinite number of multiples in common. The smallest of these is known as the least common multiple, or LCM.

Those are known as "common multiples". The smallest POSITIVE of these common multiples is called the "least common multiple".

You can't find the Common Multiple of only one number. You need at least two numbers to find a common multiple.

Since 3 and 5 are both prime numbers, the only common factor of the two numbers is 1. Perhaps you are thinking of common multiples, the first two common multiples of the two numbers are 15 and 30.

A common multiple is used to compare the multiples of two or more numbers - a single number cannot have any common multiples.

You need at least two numbers to compare multiples.

The product of the GCF and LCM of two numbers will equal the product of the two numbers.

No. Numbers don't stop.

20 and 30 could be two such numbers.