Hey math geeks! Check out these awesome clocks, on which each hour is marked by a either a math problem or a symbol representing a certain value.

Math Pop Quiz Clock

Get the conversation going the next time the MENSA meeting is at your place. Made of lightweight black metal with a matte finish Measures 11.5″ diameter Requires 1 AA Battery (not included) Easy-to-hang with “keyhole” opening on the back of the clock Work out the equations to determine the hour Fun and challenging Makes a great gift for your favorite Brainiac !

Math Pop Quiz Clock – $29.38 @ Amazon.com

Irrational Numbers Wall Clock

On our charmingly quirky wall clock, irrational numbers–those that can’t be represented by simple fractions–replace the usual markings of a traditional clock face. The numbers, though admittedly “irrational,” are logically arranged. For example, pi (3.14159…) is just a few degrees past where a three would normally be. Mathematicians and other numerical whizzes (engineers, accountants…anyone with a fancy calculator) will derive a virtual eternity of laughs from this clever home or office accessory. Black with white details, the 12″-diameter metal clock runs on one AA battery.

Irrational Numbers Wall Clock – $34.95 @ basbleu.com