LCM
Least Common Multiple (LCM) calculator - finds LCM for up to three given numbers and shows process of dividing by primes as for school-like interpretation.
Short how-to
Enter numbers for divisor/multiplier search. You can enter 2 or 3 integer numbers. If you need only 2 of them - just leave 3rd field empty!
All numbers should be non-zero integer (so you can use negative numbers).