Rational Numbers
Any number that can be written as a fraction with integers is called a Rational Number.
For example, 
are Rational Numbers.
If a number can be re-written as a fraction with integers, it is also a Rational Number.
All integers are Rational Numbers.
The number 7 is a Rational Number because it can be re-written as 
.
The number 0 is a Rational Number because it can be re-written as 
,
All mixed numbers are Rational Numbers.
is a Rational Number because it can be re-written as 
.
All decimals which terminate and which have a repeating pattern after some point are also Rational Numbers.
The number 0.2 is a Rational Number because it can be re-written as 
.
The number 0.33333… is a Rational Number because it can be re-written as 
.
Some numbers can't be re-written as a fraction with integers, and so they are not Rational Numbers. Some examples are pi and the square root of any prime number. These examples are called Irrational Numbers.
