Practical Use (No Question)

Question

I know, not a question, but a common question here is practical uses. I had one today and figured I would throw it out there.
I had a simple use that will ultimately help my son who is struggling with multiplication. I wrote a Java program with a GUI that gives him multiplication problems. They are random and there is a 10 second timer per problem. 3 X's == Restart. 20 right with less than 3 strikes and he gets the days password. Before he plays games, he has to give me said password.

Answer 1

You could make his lock screen a randomly chosen multiplication and the password being the answer ^^