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© 1999-2010 by Francis Edward Su

# Most Popular Math Fun Facts

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 How many Rationals? 4.59 Wilson's Theorem 4.53 Chords of an Ellipse 4.53 Odd Numbers in Pascal's Triangle 4.52 Deal or No Deal 4.52 Square Root of Two is Irrational 4.50 Euler's Product Formula 4.50 i to the i is a Real Number 4.47 Area of a Hyperbolic Wedge 4.46 Continuum Hypothesis 4.46 Spherical Geometry 4.46 Rental Harmony 4.45 Morley's Theorem 4.45 Four Fours Problem 4.44 Polyhedral Face Vectors 4.43 Proof with Words 4.43 Pigeonhole Principle 4.42 Birthday Problem 4.39 Prime Number Theorem 4.38 Greedy to Avoid Progressions 4.36 Sums of Three and Four Squares 4.35 Ellipsoidal Paths 4.35 Sine of (1/55555....) 4.34 One Equals Zero! 4.33 Proofs without Words 4.33 Pretzel Unlinking 4.31 Powers of Ten in Base Two and Five 4.31 Taylor-made Pi 4.31 Sperner's Lemma 4.31 Binary Card Trick 4.31 How many Primes? 4.31 Klein Bottle 4.30 Does Order of Addition Matter? 4.30 Leapfrog Addition 4.29 Finding the N-th digit of Pi 4.28 Goldbach's Conjecture 4.28 Farmers and Pesky Birds 4.27 Euler's Formula 4.27 Computability of Real Numbers 4.26 One, Two, Three, Pi 4.26 Though not among the most popular, your Fun Fact now rates: Seven Shuffles 3.92 In addition to these, there are 188 more Fun Fact files. See a random Math Fun Fact. Also available are a list of recent Math Fun Facts, or a list of all Math Fun Facts.

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