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National Council of Teachers of Mathematics
Nctm: Figure This: Are Dice Fair or Not?
Is it fair or not fair? That is the question. Try this math challenge where you use your probability and number sense skills to determine whether or not a game is fair. Find out how mastering this challenge can be useful in real life...
University of Cambridge
University of Cambridge: Nrich: Instant Insanity
Excellent interactive challenge working with cube nets to stack them in a specific order. Manipulate the cubes online to solve the problem.