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Pi Trivia Game

Braingle hosts more than 20,000 brain teasers, trivia quizzes, games, and mentalrobics (aerobics for the brain). The games section is comprised of popular games like chess, checkers, sudoku, and common word games. The Mentalrobics section of Braingle is what makes it worth mentioning. Mentalrobics includes memory tests, flashcards, and vocabulary building activities. The vocabulary builder activities require users to register for a free Braingle account. To help users practice more effectively the Braingle vocabulary builder tracks the words users know and the ones they don't.

"Want to learn how to quickly square a number that ends in 5? Or how to tell if a number is divisible by 3? Or maybe you'd like to learn how to calculate square roots by hand? That's the kind of fun and fascinating math tricks and trivia you'll find here at CuriousMath.com."

The Discovery Channel website lets you test your trivia knowledge while playing the same quizzes the contestants on Cash Cab play. Play the Cash Cab quiz game and earn fictitious money for every question you answer correctly. Answer three questions incorrectly and the game is over.