Q: Which number is a common factor of any pairs of number?

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The LCM is the other number.

6d is the greatest common factor since it is a factor of itself and of 18d. Remember any number or term is a factor of itself because any number can go into itself once.

There are not always an even number of factor pairs of a number - for example, prime numbers have an even number of factors, because they are divisible by themselves and 1, but this is only one pair of factors. However, for any square number, (for example, 3 x 3 = 9, 4 x 4 = 16), at least one of these factor pairs will consist of the same number repeated twice.

5 and any multiple of 5 5,10 5,15 5,20

It is: 12

Related questions

The LCM is the other number.

There is always a common factor, even if it's only 1.

Factor pairs are any two numbers being multiplied to give you a certain number. Factor Pairs of 16: 8x2, 4x4, and 16x1.

Any pair of prime or relatively prime numbers.

Given a pair of numbers, if the lesser of the two is the GCF, the greater of the two is the LCM. This happens when one of the numbers is a factor of the other.

Any number can be a common factor. 3 is a common factor of 9 and 12.

No, that's just a factor. A common factor is when that factor is also a factor of another number.

The least common factor of any set of numbers is 1.

The greatest factor of any positive number is the number itself.

Any non-zero integer can be a common factor.

You need two number to get a common factor. A single number doesn't have any.

It can be any number if the other in the pair is its multiple. For example, if x and k are any integers then GCF(x, kx) = x