The Math Clock will give you a challange every hour because each hour have a simple math problem that you need to solve in order to know what time it is (if you don't count every math problem as an hour of course). Solve the math problems and reveal time!

The clock has black powder coating to simulate that it's made out of a piece of blackboard and the math problems looks like they've been written on the clock with chalk to give you a real nerdy classroom feeling!