Answers

The gcf of 12 and 20 is 4.

Steps to find GCF

1. Find the prime factorization of 12
   12 = 2 × 2 × 3
2. Find the prime factorization of 20
   20 = 2 × 2 × 5
3. To find the gcf, multiply all the prime factors common to both numbers:
   
   Therefore, GCF = 2 × 2
4. GCF = 4

The greatest common factor (gcf) is also known as greatest common divisor (gcd) or highest common factor (hcf).

Related

Find hcf of: 24 & 40 6 & 10 36 & 60 60 & 100 84 & 140 24 & 20 12 & 40 36 & 20 12 & 60 60 & 20 12 & 100 84 & 20 12 & 140

GCF Calculator

Enter two numbers separate by comma. To find gcf of more than two numbers, click here.