Number Systems – Notes

Natural Numbers

Counting numbers 1,2,3,4…. are called natural numbers and the collection of natural numbers is denoted by N.

Whole Numbers

Zero along with the natural numbers represent whole numbers and the collection of Whole number is denoted by ‘W’.

Integers

Integers are collection of positive and negative numbers including zero and the collection of integers is denoted by ‘Z’.

Rational Numbers

A number ‘r’ is called a rational number, if it can be written in the form p/q, where p,q ε Z and q≠0.