GCD and LCM Calculator Guides
Step by step guides with worked examples for the GCD and LCM Calculator.
The Relationship Between GCD and LCM
Why the GCD times the LCM always equals the product of two numbers, and how to use it as a free check on your answer.
Read the guide →Where GCD and LCM Are Used
Where GCD and LCM appear in real life: reducing fractions, tiling, scheduling, cutting cake and counting lattice points.
Read the guide →How to Find the Greatest Common Divisor
How to find the greatest common divisor by repeated division, with worked examples and why the algorithm is so efficient.
Read the guide →How to Find the Least Common Multiple
How to find the least common multiple by formula and by prime factorisation, with worked examples and common mistakes.
Read the guide →Reading a Prime Factorisation
How to read and build a prime factorisation, notation conventions, and how to get the GCD and LCM from factorisations.
Read the guide →