Greatest Common Factor of 140 and 420
GCF(140, 420) = 140, Greatest common factor of 140 and 420 is 140. 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 420. Greatest Common Factor by prime factorization method and Greatest Common Factor by matching factors method.
Greatest Common Factor of 140 and 420 by prime factorization method
We will first find the prime factorization of 140 and 420.
Prime Factorization of 140 is 1, 2, 2, 5, 7 and Prime Factorization of 420 is 1, 2, 2, 3, 5, 7.
- Factorize\( (140) = \) \(1\times 2\times 2\times 5\times 7\)
- Factorize\( (420) = \) \(1\times 2\times 2\times 3\times 5\times 7\)
Now we need to find any which are common for each number (1, 2, 2, 5, 7) and multiply these numbers together.
\(GCF(140, 420) = 1\times 2\times 2\times 5\times 7 = 140\).
Greatest Common Factor of 140 and 420 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 420 leaving a remainder zero is 1, 2, 3, 4, 5, 6, 7, 10, 12, 14, 15, 20, 21, 28, 30, 35, 42, 60, 70, 84, 105, 140, 210, 420
As you can see, 140 is the greatest and common number that 140 and 420 divides into.
So the greatest common factor 140 and 420 is 140.
\(GCF(140, 420) = 140\).
If you want to learn more about greatest common divisor, take a look at the Wikipedia page.
