What goes in the box?

Solved it ...

Being given the answer and asked to find the question really helps to develop a deep understanding of the mathematics involved in calculation. When faced with empty boxes for three two digit numbers Marcus took the time to carefully read the question which ensured that he did as the question stated and only used the digits 1 and 9. 

 He then went on to give a clear explanation of exactly how he arrived at his correct  answer. Empty box questions are just a challenge to be met head on by this young man.

and can explain how I did it.