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. 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.

Real Algebraic

The real subset of the algebraic numbers: the real roots of polynomials. Real algebraic numbers may be rational or irrational. √2 = 1.41421... is irrational. Irrational decimal expansions neither end nor repeat. Represented as AR

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

3. What is this number an example of '29th'

	Natural Number
→	Natural numbers are only positive integers
	Ordinal number
→	A number used to identify the relative position of one number to another.
	Real Number
→	All integers are also real numbers
	Integer
→	Integers are positive or negative

4. What is the symbol 'Z' representative of

	Natural Number
→	Natural numbers are only positive integers
	Ordinal number
→	A number used to identify the relative position of one number to another.
	Real Number
→	All integers are also real numbers
	Integer
→	Integers are positive or negative

5. What is the difference between natural numbers and integers?

	Integers can include negatives
→	This is correct.
	Natural numbers can include negatives
→	Natural numbers can only be positives. Integers can be negative or positive.
	Natural numbers have to be a whole number
→	Both integers and natural numbers must be whole numbers.
	Integers can include 0
→	Both integers and natural numbers can include 0.

6.

What type of number is used for identifying the size of something?

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