GCD & LCM
Math
GCD (HCF)6
LCM36
About the GCD & LCM calculator
Use this free GCD & LCM calculator. Enter a, b and it shows gcd (hcf), lcm instantly. With the default values, the gcd (hcf) comes to 6.
How the GCD & LCM calculation works
GCD is the largest number dividing both; LCM = A × B ÷ GCD.
Tip: GCD simplifies fractions and LCM finds common denominators.
Frequently asked questions
What does the GCD & LCM calculator do?
It takes a, b and instantly calculates gcd (hcf), lcm.
Is the GCD & LCM calculator free?
Yes. It is free, needs no signup and runs in your browser, so your numbers are not stored.
Which currency does it use?
Amounts are plain numbers, so use any currency consistently.
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