Greatest Common Factor of 9 and 15
GCF(9, 15) = 3, Greatest common factor of 9 and 15 is 3. Greatest Common Factor or Greatest Common Divisor of two numbers is the largest integer by which both the numbers can be divided. There are two different methods to calculate Greatest Common Factor of 9 and 15. Greatest Common Factor by prime factorization method and Greatest Common Factor by matching factors method.
Greatest Common Factor of 9 and 15 by prime factorization method
We will first find the prime factorization of 9 and 15.
Prime Factorization of 9 is 1, 3, 3 and Prime Factorization of 15 is 1, 3, 5.
- Factorize\( (9) = \) \(1\times 3\times 3\)
- Factorize\( (15) = \) \(1\times 3\times 5\)
Now we need to find any which are common for each number (1, 3) and multiply these numbers together.
\(GCF(9, 15) = 1\times 3 = 3\).
Greatest Common Factor of 9 and 15 by matching factors method
List of positive integers factors of 9 leaving a remainder zero is 1, 3, 9
List of positive integers factors of 15 leaving a remainder zero is 1, 3, 5, 15
As you can see, 3 is the greatest and common number that 9 and 15 divides into.
So the greatest common factor 9 and 15 is 3.
\(GCF(9, 15) = 3\).
If you want to learn more about greatest common divisor, take a look at the Wikipedia page.
