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  This time 3 new calculators for fractions: Fractions: adding and subtracting, Fractions: 4 operations and Fractions: inverse (reciprocal). Each of them shows all sub-steps needed to compute common denominators, create improper fraction (if needed), reduce the fraction etc.

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 !
Some facts
  • Greatest Common Divisor is the largest positive integer that divides two or more numbers without remainder
  • Greatest Common Divisor (GCD) is also known as Greatest Common Factor (GCF) and Highest Common Factor (HCF)
  • GCD is mainly useful for reducing fractions to be in lowest terms possible.
How to use this tool
To search for greatest common divisor or least common multiplier enter your numbers into fields below.
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).

Enter numbers:

If you need only 2 numbers - just leave 3rd field empty!

Enter number #1

Enter number #2

Enter number #3

optional (leave empty)


Greatest Common Divisor (GCD):
GCD prime factors:

Least common multiple (LCM):
LCM prime factors:

Processing time (performance): ms