GCF Calculator
Find the greatest common factor, also called the highest common factor, by prime factors or by Euclid's algorithm. Every step is written out, and the shared primes sit in the middle of a Venn diagram.
What you can do
- Work by prime factors or by Euclid's algorithm
- Venn diagram of the shared primes for two or three numbers, or a factor table for more
- Euclid's algorithm drawn as a rectangle filled with squares
- See the LCM and the simplest ratio of two numbers alongside it
- Practise with random questions and worked solutions