great idea :) reminds me of old educational software from my youth. BBC Micro etc.
Save the World by practicing basic math functions, like multiplication table, adding.
On the left and right, select a number so that the end result of the product is equal to the value of the bomb. This will destroy the bomb.
Provide the 2 digit end result of multiplication.
Provide the 2 digit end result of adding.
Get as many points as possible.
1. Mouse (click on the digits on both side separately)
2. Keyboard (left side: normal digit keys, right side: keypad digits)