A fraction in the form 0.75 is called a 'decimal' fraction.
The equivalent fraction in the form 

is called a 'vulgar' fraction. 
3 is called the 'numerator'.
4 is called the 'denominator'
When the denominator is not 10, 100 or 1000 it is probably easier to use a calculator to convert a vulgar fraction into a decimal fraction.
Try to remember the following:

= 0.5 

= 0.25 

= 0.75 



= 0.2 

= 0.4 

= 0.6 

= 0.8 

= 0.125 





