##### 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.

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ShikshaHouse

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CBSE Class 9th Maths 1 - Number Systems - Notes

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