Real Numbers

A real number is any number that can be shown on a number line.

If a number cannot be shown on a number line it is not real, but imaginary.

Real numbers can be either rational or irrational.

Rational Numbers

real numbers that can be expressed as a ratio of two numbers

Examples: 2 ( ( 2 = 2/1), -7, 1/5, 0.345, etc.

Integers

whole numbers and their

Examples: 0, 5, -5, 71, -71

Whole Numbers

zero and natural numbers

Examples: 0, 1, 2, 3

Natural Numbers

all numbers 1, 2, 3, 4 ... to infinity

Irrational Numbers

real numbers that can not be expressed as a ratio of integers ( fraction)

Examples: pi, radical 11, repeating decimals 0.321321, etc.