Greatest Common Factor of 140 and 84
GCF(140, 84) = 28, Greatest common factor of 140 and 84 is 28. 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 140 and 84. Greatest Common Factor by prime factorization method and Greatest Common Factor by matching factors method.
Greatest Common Factor of 140 and 84 by prime factorization method
We will first find the prime factorization of 140 and 84.
Prime Factorization of 140 is 1, 2, 2, 5, 7 and Prime Factorization of 84 is 1, 2, 2, 3, 7.
- Factorize\( (140) = \) \(1\times 2\times 2\times 5\times 7\)
- Factorize\( (84) = \) \(1\times 2\times 2\times 3\times 7\)
Now we need to find any which are common for each number (1, 2, 2, 7) and multiply these numbers together.
\(GCF(140, 84) = 1\times 2\times 2\times 7 = 28\).
Greatest Common Factor of 140 and 84 by matching factors method
List of positive integers factors of 140 leaving a remainder zero is 1, 2, 4, 5, 7, 10, 14, 20, 28, 35, 70, 140
List of positive integers factors of 84 leaving a remainder zero is 1, 2, 3, 4, 6, 7, 12, 14, 21, 28, 42, 84
As you can see, 28 is the greatest and common number that 140 and 84 divides into.
So the greatest common factor 140 and 84 is 28.
\(GCF(140, 84) = 28\).
If you want to learn more about greatest common divisor, take a look at the Wikipedia page.
