greatest common factor: calculate GCF with Online calculator

Online calculator: Greatest common factor

Online Calculators: Greatest Common Factor Example: You need to find the greatest common factor between two or three numbers. The greatest common factor means the greatest factor that divides two or three numbers.

How to find GCF? To find the greatest common factor of 12 and 20, you need to list prime factors of each number. After you find the prime factors, multiply the factors which are in common from both numbers.

For example, if a common factor is a number 2 and a number 4, multiply them. The result will be the greatest common factor. If there are no common numbers, the answer is always "1".