4.3 Division
Division can also be written as a fraction and in the example below it becomes even clearer if we rewrite them that way. We begin to explain with a few basic examples:
You hopefully know that 

= 1 
and that, 

= 1. 

With this then 

equal to 1 
a 

= 1. 

If you check the answer by multiplying you get 1· a = a, which is correct.
We can also say that 

= 1 
because the numerator is equal to the denominator. 
To simplify the fraction, we normally use simplification by division. Here are a few examples where we divide both the numerator and denominator with the same number or variable.
D. 

= 

= 

= a^{25 }= a^{3} 
