Calculate the Greatest Common Factor (GCF), also called Greatest Common Divisor (GCD) or Highest Common Factor (HCF), of two or more numbers.
Enter integers separated by commas.
The GCF of two or more integers is the largest positive integer that divides each of them without a remainder.
For two numbers: GCF(a,b) = GCF(b, a mod b), repeating until b=0. Example: GCF(48,36) → GCF(36,12) → GCF(12,0) = 12.
Used to simplify fractions, factorise algebraic expressions, and solve word problems involving equal groups.