Greatest Common Factor of 128 and 561
GCF(128, 561) = 1, Greatest common factor of 128 and 561 is 1. 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 128 and 561. Greatest Common Factor by prime factorization method and Greatest Common Factor by matching factors method.
Greatest Common Factor of 128 and 561 by prime factorization method
We will first find the prime factorization of 128 and 561.
Prime Factorization of 128 is 1, 2, 2, 2, 2, 2, 2, 2 and Prime Factorization of 561 is 1, 3, 11, 17.
- Factorize\( (128) = \) \(1\times 2\times 2\times 2\times 2\times 2\times 2\times 2\)
- Factorize\( (561) = \) \(1\times 3\times 11\times 17\)
Now we need to find any which are common for each number (1, 1) and multiply these numbers together.
\(GCF(128, 561) = 1\times 1 = 1\).
Greatest Common Factor of 128 and 561 by matching factors method
List of positive integers factors of 128 leaving a remainder zero is 1, 2, 4, 8, 16, 32, 64, 128
List of positive integers factors of 561 leaving a remainder zero is 1, 3, 11, 17, 33, 51, 187, 561
As you can see, 1 is the greatest and common number that 128 and 561 divides into.
So the greatest common factor 128 and 561 is 1.
\(GCF(128, 561) = 1\).
If you want to learn more about greatest common divisor, take a look at the Wikipedia page.
