- Books Name
- CBSE Class 7 Mathematics Book

- Publication
- Param Publication

- Course
- CBSE Class 7

- Subject
- Mathmatics

**Introduction**

We have studied various types of numbers till now. These numbers are used for counting and for various other practical purposes.

**Types of Numbers **

1. Natural Numbers 2. Whole Numbers 3. Integers

**1. ** **Natural Numbers: **All numbers which are used for counting are called natural numbers.

{1, 2, 3,......} etc. are examples of natural numbers. The set of natural numbers is denoted by N,

i.e. N = {1, 2, 3,.......}

**2**. **Whole Numbers:** All natural numbers including zero are called whole numbers. {0, 1, 2 3,....} etc. are examples of whole numbers. The set of whole numbers is denoted by W, i.e. W = {0,1,2,3......}

**3 Integers: **All whole numbers as well as their negatives are called integers. {...–3, –2, –1, 0, 1, 2, 3,...} are examples of integers. The set of integers is denoted by I, i.e. I = {...–3, –2, –1, 0, 1, 2, 3,...}

** Important Points :**

(i) All natural numbers are whole numbers but all whole numbers are not natural numbers.

(ii) Zero(0) is an integer which is neither a positive number nor a negative number.

(iii) When zero(0) is added to any other number, it gives the same number.