This little game will test your ability:
http://freeworldgroup.com/games6/gameindex/the-equator.htm
You have to click on three numbered boxes, in order, that will make a math equation be correct, using either addition, subtraction, multiplication, or division. (Example: 1 + 1 = 2) The computer will decide which sign is correct for the equation, depending on the three boxes you click & the order in which you click them.
Here are the kickers......
All three boxes have to be adjacent to each other somehow -- horizontally, vertically, or diagonally.
The game is timed, and new numbers keep dropping down on top of the old ones. Speed is important to your score. Think fast!
If the stack of numbers reaches the top of the board, it's Game Over. The computer then tells you how "smart" you are....or not!
You have "bombs" which will clear a large chunk of numbers from the board at one time. But if you set off a bomb, you lose points. You also have a "power" symbol which will change the numbers in the nearby boxes (and drop them down one). You can shuffle the board, but I think this lowers your score, too.
Each level gets harder, with more numbers to clear while other numbers drop down. Watch your left & right edges - they can stack up fast!
Click on Instructions to see these steps in action.
It's an evil little game that is a great time-waster & a bit addictive!
Good luck & have fun!