Greatest Common Factor (GCF) Calculator

Enter two or more whole numbers separated by commas or spaces.

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Understanding Greatest Common Factor (GCF)

The greatest common factor (GCF), also known as the greatest common divisor (GCD) or highest common factor (HCF), is the largest positive integer that divides each of the integers without a remainder.

How to Find the GCF

There are several methods to find the GCF:

  1. Factoring: List all factors of each number and find the largest common one.
  2. Prime Factorization: List prime factors of each number and multiply the common ones.
  3. Euclid's Algorithm: Repeatedly subtract the smaller number from the larger until you get zero.

Example: Finding GCF by Factoring

Find the GCF of 18 and 27.

Factors of 18: 1, 2, 3, 6, 9, 18

Factors of 27: 1, 3, 9, 27

The GCF is 9.

GCF of 0

GCF(k, 0) = k for any whole number k, but GCF(0, 0) is undefined.

About the GCF Calculator

This calculator helps you find the greatest common factor of two or more numbers quickly and accurately. It's useful for simplifying fractions and solving various mathematical problems.

Benefits of Using This Calculator

Tips for Effective Use

  1. Enter whole numbers separated by commas or spaces.
  2. Use this tool to verify your manual calculations.
  3. Understand the different methods (factoring, prime factorization, Euclid's algorithm).
Tip: Ensure you enter whole numbers to get accurate results.