Online math exercises


The greatest common ( GCD )  of two numbers is the biggest number by which both these two numbers are divisible without a remainder. 

Ways to find GCD:

The least common multiple ( LCM ) of two numbers is the least number which divides on both these two numbers without a remainder.

Ways to find LCM: 

Understanding GCD, LCM and knowledge of the signs of divisibility is necessary in work with fractions.