# Types of Number

## Contents

# Overview

https://www.youtube.com/watch?v=PFSYJ7uOiOk&list=PLCiOXwirraUCa2MYf_oSM94uvwIGPMZ1q

## Natural Numbers

A positive whole number including zero. Represented as N = (0,1,2,3,4 ....)

## Integer Numbers

Integers are like whole numbers, but they also include negative numbers ... but still no fractions allowed. Represented as Z = (...,-2,-1,0,1,2,...)

## Rational Numbers

A number that can be expressed as a fraction or ratio. An example of this is 8 or even 1/8. Represented as Q

## Irrational Numbers

A number that cannot be represented as a fraction or ratio, the decimal form will contain infinite repeating values. An example of this is √7 because it cannot be simplified.

## Real Numbers

Any positive or negative number with or without a fractional part.

## Ordinal Numbers

A number used to identify the relative position of one number to another. Unlike the other types of numbers it does not have a representative symbol. An example of this would be 1st, 2nd, 3rd.

## Cardinal Numbers

A Cardinal Number is a number that says how many of something there are, such as one, two, three, four, five.