The number system is a way of representing numbers in the computer system. It can be divided into two main segments, i.e. positional and non-positional number systems. The Roman number system is one example of the non-positional number system. This Master Class covers the topic of the number systems, where data can be represented in computers in various forms, so explaining the types of the positional number systems, which are basically decimal number system, octal number system, hexadecimal number system and binary number system. Computer does every operation in binary, so more focus will be on binary number system and since data can be represented or collected in any form so it is possible to convert from any given number system to any other number system by doing some calculations. Here we will learn some techniques by which we can convert a given number system to another number system.