- A has a problem – He wants to lay square tiles on a floor of dimension X x Y but he wants to lay the least number of square tiles possible. Can you help him solve this problem.
- Student B was asked to find the least positive number that leaves remainders 2, 5 and 13 when divided by 5, 8 and 16 respectively.

The first problem can be solved using HCF while the second can be solved using LCM. In this topic we will deal with the various kinds of problems on HCF and LCM.

The first lesson in this topic is an introduction to HCF and LCM where you will learn how to find HCF and LCM and how HCF and LCM are related to each other. The exercises contain solved question and answers on HCF and LCM. When solving exercises, we recommend you to try solving the problems on your own, then view the solution.