Want a no multiple choice option

This is a great app, but I wish there was a way to turn off the multiple choice option so one could enter the answer in a text field and see if their answer is correct. Im aware theres an option to hide the multiple choice answers first, but it seems to me that while the multiple choice option would be beneficial in the beginning while learning the methods, it might be more useful and more challenging to be able to enter your own answer. Ive been looking for an app like this, and this one is the best Ive found, but I would like to see that one feature if it is ever at all possible.

Ecp84 about Mathemagics: Mental Math, v5.0.1