Just click the button, then type all of your numbers and such into that answer box. When you finish your problem, and you're wondering what the heck to do with that other answer box, type in anything and it will reset. Enjoy, but don't ACTUALLY use it for homework, your parents may get slightly ticked. Warning: It will not work for extreeeemely evil problems, like 1 / 125...... click the button once more if you'd like to enter another problem.
I don't know what to put here.