Number system

 

  Notes created by- Mr. Shashank newaskar                  

         NUMBER SYSTEM

1.Natural Number-All positive counting number’s which start from 1 and goes up to  +∞ (Plus infinity) that number’s are called Natural Number.

We represent natural numbers by  “  N  ” 

          Example-  1,   2,   3,   4,   5   ……………………+∞

2.Whole number- All positive counting number’s which start from 0 and goes up to  +∞ (Plus infinity) that number’s are called Whole Number.

We represent Whole numbers by  “  W  ”   

Example-  0,   1,   2,   3,   4,   5   ……………………+∞

3.Integer number- Those number’s which start from -∞(Minus infinity) and goes up to  +∞ (Plus infinity) that number’s are called Integer Numbers.

We represent Integer numbers by  “  Z  ”

Example-    -∞ ……….. -3,  -2,  -1,     0,   1,   2,   3,……………+∞

Note : Integer numbers may be negative ,  may be zero ,  or may be positive numbers.

4.Even number  - An Even number is an integer that can be divided by two (2).

Example-    2 ,  4 ,  6,  8,  10,  12, ……………etc.

5.Odd number  - An Odd number is an integer that can not be divided by two (2).

Example-    1 ,  3 ,  7,  9,  11,  13, ……………etc.