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Lots of numbers are NOT common factors. For example, 5, 7, 100...Get the greatest common factor of both numbers. All common factors are factors of this greatest common factor. Note that all of them must needs be less than or equal to the greatest common factor.

Any other number is NOT a common factor.

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Q: What number is not a common factor for 12 and 30?

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Related questions

Everything except 1,2,3 and 6.

5 is not a factor of 12.

The greatest common factor of 8, 12, and 30 is 2

The least common factor is: 1

Anything that isn't 1, 2, 3, 6

The Greatest Common Factor (GCF) is: 6

Common factors of 12 and 30 are: 1, 2, 3, and 6.

The largest factor that 12 and 30 have in common is the product of the two prime factors they have in common.

The Greatest Common Factor is 2

The lowest common factor is: 1

The Greatest Common Factor (GCF) is: 6

It is: 1 but the highest common factor is 6

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