Chapter 2

Whole Numbers

What are whole Numbers?

Let’s begin with natural Numbers.

When we begin to count we naturally use counting Numbers {1, 2, 3, 4.}. Hence, Natural Numbers are the numbers starting from number 1 to infinity
We represent natural Numbers by ‘N’.

Or we can say N = {1, 2, 3, 4.} (i.e. 1 to infinity)
For Every natural number, there is a predecessor and a successor.

For Example: Predecessor of 2 is 1 and

Successor of 2 is 3.

The set of natural Numbers along with zero are called whole Numbers. The set of Whole Numbers without decimal or fractional Numbers.
We represent whole Numbers by ‘W’.

Or we can say W = {0, 1, 2, 3, 4.} (i.e. 0 to Infinity)

Important Note

1. We can get successor of a whole number by adding 1 to the given whole number.
E.g. 9
Then, number is 9.
Successor = 9+ 1 = 10

every whole number has its successor.
2. We can get predecessor of whole number by subtract 1 from given whole number.
Illustration 23
Then, number is 23
Precursor = 23-1 = 22

3. Zero has no predecessor.
4. The 
lowest
whole number is‘0’.
5. There's no largest number in set of whole Numbers.
6. Every whole number without ‘zero’ is a natural number