Pastime game : Math Speed

Pastime game : Math Speed is a simple and addictive game based on math operations addition and multiplication.
The goal of the game is to clear the screen from all numbers by using your math basics. Just tape the numbers you want to use to equal the result in the yellow circle.
The game has two modes : Free play mode and Challenge mode. The difficulty of the challenge mode is the time factor : You should make each calculation in less than 10 seconds (see timer in the blue circle).
When you finish the level, you can play the next one.
This game is a perfect pastime when you are in a waiting room, in a bus going home or in a break at work etc.
It can also be a good (and funny) way to improve your kids' mathematical skills.
The design is pretty simple and cool.
If you think you are too old for this game, just try it (especially the multiplication part)
Have fun !