Arithmetic Four is a Connect Four variation where you have to answer an arithmetic question correctly before you can play a chip. You get to choose the category, the operation, the difficulty level and the time limit.

http://www.shodor.org/interactivate/activities/ArithmeticFour/?version=1....

Arithmetic Quiz is similar but without the Connect Four interface.

http://www.shodor.org/interactivate/activities/ArithmeticQuiz/