HCF and LCM Calculator

Enter two whole numbers to find their HCF (GCD) and LCM. The prime factorization of each number and the working are shown.

First number

Second number

HCF and LCM

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How it works

HCF × LCM = a × b. HCF is the product of common prime factors, LCM of all prime factors to the highest power.

Frequently Asked Questions

What is the difference?

The HCF is the largest number that divides both. The LCM is the smallest number both divide into.