## What are the common factors of 15?

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

1 and 3 are the only common factors (numbers which are factors of both 12 and 15)..

## What are the common factors of 20?

What are the common factors of 20 and 25? The factors of 20 are 1, 2, 4, 5, and 20. The factors of 25 are 1, 5, and 25. The common factors of 20 and 25 are 1 and 5.

## What are the common factors for 16 and 20?

Greatest common factor (GCF) of 16 and 20 is 4. We will now calculate the prime factors of 16 and 20, than find the greatest common factor (greatest common divisor (gcd)) of the numbers by matching the biggest common factor of 16 and 20.

## What factors do 15 and 21 have in common?

Greatest common factor (GCF) of 15 and 21 is 3. We will now calculate the prime factors of 15 and 21, than find the greatest common factor (greatest common divisor (gcd)) of the numbers by matching the biggest common factor of 15 and 21.

## What are the common factors of 15 and 25?

1 AnswerThe Greatest Common Factor of 15and25 is 5.The factors of 15 are 3and5. (the number itself and 1 do not count).The factor(s) of 25 is 5 . After all, it is a square number.The only factor that is in common is 5.(again remember that 1 does not count here -although 1 is common, 5 is higher)

## What are the common factors of 9 and 15?

What is the GCF of 9 and 15The factors of 9 are 9, 3, 1.The factors of 15 are 15, 5, 3, 1.The common factors of 9 and 15 are 3, 1, intersecting the two sets above.In the intersection factors of 9 ∩ factors of 15 the greatest element is 3.Therefore, the greatest common factor of 9 and 15 is 3.