# Number System

From time immemorial human beings have been trying to have a count of their belongings- goods, ornaments, jewels, animals, trees, sheeps or goats, etc. by using various techniques. One of the greatest inventions in the history of civilization is the creation of numbers.

### Level 1

- Introduction to Numbers
- Natural Numbers
- Whole Numbers
- Integers
- Rational Numbers
- Factors and Multiples
- Prime and Composite Numbers
- Even and Odd Numbers
- Tests for Divisibility of Numbers
- Prime Factorisation
- Highest Common Factor
- Lowest Common Multiple