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What are the common factors and greatest common factor of 15?

There is neither a greatest common factor nor common factors of a single number, such as 15, because there cannot be any form of common factor without two or more numbers to compare. Common factors are factors that the numbers being compared have in common. The greatest common factor is the largest factor that all the numbers being compared have in common. Thus, since there are not two or more numbers to compare, there are neither common factors nor a greatest common factor.

The factors of 15 are 1, 3, 5, and 15.

The prime factors of 15 are 3 and 5.

Examples:

The common factors of 6 and 15 are 1 and 3; the greatest common factor is 3.

The common factors of 15 and 18 are 1 and 3; the greatest common factor is 3.

The common factors of 15 and 55 are 1 and 5; the greatest common factor is 5.

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A number a power of a variable or a product of the two is a monomial while a polynomial is the of monomials

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