Greatest Common Factor of 156 and 1978
GCF(156, 1978) = 2, Greatest common factor of 156 and 1978 is 2. 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 156 and 1978. Greatest Common Factor by prime factorization method and Greatest Common Factor by matching factors method.
Greatest Common Factor of 156 and 1978 by prime factorization method
We will first find the prime factorization of 156 and 1978.
Prime Factorization of 156 is 1, 2, 2, 3, 13 and Prime Factorization of 1978 is 1, 2, 23, 43.
- Factorize\( (156) = \) \(1\times 2\times 2\times 3\times 13\)
- Factorize\( (1978) = \) \(1\times 2\times 23\times 43\)
Now we need to find any which are common for each number (1, 2) and multiply these numbers together.
\(GCF(156, 1978) = 1\times 2 = 2\).
Greatest Common Factor of 156 and 1978 by matching factors method
List of positive integers factors of 156 leaving a remainder zero is 1, 2, 3, 4, 6, 12, 13, 26, 39, 52, 78, 156
List of positive integers factors of 1978 leaving a remainder zero is 1, 2, 23, 43, 46, 86, 989, 1978
As you can see, 2 is the greatest and common number that 156 and 1978 divides into.
So the greatest common factor 156 and 1978 is 2.
\(GCF(156, 1978) = 2\).
If you want to learn more about greatest common divisor, take a look at the Wikipedia page.
