Types of Number

Natural Numbers

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

Integer Numbers

Any positive or negative whole number including zero. Represented as Z = (...,-2,-1,0,1,2,...)

Rational Numbers

A number that can be expressed as a fraction or ratio. Represented as Q

Irrational Numbers

A number that cannot be represented as a fraction or ratio, the decimal form will contain infinite repeating values.

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.

Cardinal Numbers

A number used to identify the size of something.

Revision

1. -1 is not included in which of the following

	Natural Number
→	Natural numbers are only positive integers
	Rational Number
→	All integers can be respresented as a ratio
	Real Number
→	All integers are also real numbers
	Integer
→	Integers are positive or negative

2. 12 is not included in which of the following

	Natural Number
→	Natural numbers are only positive integers
	Irrational Number
→	All integers can be respresented as a ratio
	Real Number
→	All integers are also real numbers
	Integer
→	Integers are positive or negative

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