GCD
Greatest Common Divisor (GCD) calculator - solves GCD for given numbers, but also displays prime dividers (in a school-like way). So, you know how the solution is found. It can find the GCD for 3 numbers too !
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).