GCF Calculator
Find the Greatest Common Factor (GCF) of two numbers. Also known as GCD (Greatest Common Divisor) or HCF (Highest Common Factor).
What is GCF (Greatest Common Factor)?
The Greatest Common Factor (GCF) is the largest positive integer that divides two or more numbers without leaving a remainder. It's used to simplify fractions, find equivalent ratios, and more.
Three Methods to Find GCF
1. Listing Factors: List all factors of each number and find the largest common one.
2. Prime Factorization: Find prime factors and multiply common ones with lowest powers.
3. Euclidean Algorithm: Use repeated division - efficient for large numbers.