## Number System

##### 1. Natural numbers {N}

The counting numbers {1, 2, 3, 4, 5…} are called natural numbers.

##### 2. Whole numbers

Natural numbers including 0 {0, 1, 2, 3, 4, 5…} are also called **whole numbers**.

Negative numbers {-1, -2, -3,} are not considered “whole numbers.”

##### 3. Integers {Z}

Positive and negative counting numbers, as well as zero: {…, −3, −2, −1, 0, 1, 2, 3, …} are called integers.

##### 4. Even Number

The Numbers divisible by 2 are known as Even Numbers.

Even Numbers – 2, 4, 6, 8, 10, 12, 14, 16, 18 and so on.

##### 5. Odd Numbers

The Numbers which are not divisible by 2 are known as Odd Numbers. In other words, the odd numbers are those numbers that are not even.

Odd Numbers – 1, 3, 5, 7, 9, 11, 13, 15, 17, and so on.

##### 6. Prime Number

The numbers are divisible by one and itself and not divisible by any other number.

Prime Numbers are: 2, 3, 5, 7, 11, 13, 17, 19, 23, 29 and so on.

##### 7. Rational Number

A rational number is any number that can be expressed as a simple fraction, like 1/2 or 3/4. Where the top number (numerator) is a whole number and the bottom number (denominator) is not zero.

Example – 5/6, 2/3, 5/4.

##### 8. Composite Numbers

A composite number is a whole number (greater than 1) that is not prime.

Composite numbers C= (4,6,8,9 ……..,etc.)

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