How Do You Write 4 in Between 5

 It's always an Indian Brain... Must Read

Is it Possible to Write 4 in Between 5? 

Is it a Math Quiz? Is it Challenging to Answer? Or Not!

Mathematician: How do you write 4 in between 5?   

Chinese : Is this a Joke?
 
Japanese : Impossible!
 
American : The Question's all Wrong!
 
British : It's not found on the Internet
 
And the Indian..

Write IV in F[IV]E