What is the GCF of 20 and 12?
GCF also known as GCD of two or more numbers is the largest possible number which divides the given numbers exactly without any remainder.
Answer: GCF of 20 and 12 is 4
Two methods to find the GCF of 20 and 12 are explained below.
Methods to find GCF of 20 and 12

Prime factorization Method

Long division Method
Method1: GCF of 20 and 12 by Prime Factorization
Below is the prime factorisation done for 12 and 20
Method2: GCF of 20 and 12 by Long Division

Step 1: Divide 20 by 12 and check the remainder.

Step 2: Make the remainder of the above step as the divisor and the divisor of the above step as the dividend and perform the long division again.

Step 3: Continue till you get remainder as 0