Most Popular Math Fun Facts

• Visual Multiplication with Lines 4.63
• Greedy to Avoid Progressions 4.59
• Surface Area of a Sphere 4.56
• Pi Approximations 4.55
• Kaprekar's Constant 4.54
• Right Double Cone 4.54
• Squaring Quickly 4.53
• How many Primes? 4.53
• Pretzel Unlinking 4.52
• Banach-Tarski Paradox 4.49
• One Equals Zero! 4.48
• Goldbach's Conjecture 4.45
• Reuleaux Wheel 4.45
• How many Rationals? 4.45
• Multiplication by 111 4.43
• Products of Sums of Two Squares 4.39
• Quick Square Roots 4.38
• All Horses are the Same Color 4.37
• Gabriel's Trumpet 4.37
• Sums of Three and Four Squares 4.36
• Hailstone Numbers 4.36
• Morley's Theorem 4.36
• Magic 1089 4.34
• Zero to the Zero Power 4.34
• Euler's Product Formula 4.33
• Fermat's Last Theorem 4.33
• Area of an Ellipse 4.33
• Pythagorean Triples 4.33
• Red-Black Card Trick 4.33
• Misleading Sequence 4.33
• Continuous but Nowhere Differentiable 4.33
• Fibonacci GCD's, please 4.32
• Are Coins Fair? 4.32
• Bike with Square Wheels 4.31
• Sum of Prime Reciprocals 4.31
• Polyhedral Face Vectors 4.31
• Sphere Eversions 4.31
• Sine of (1/55555....) 4.31
• Kakeya Needle Problem 4.31
• Multidimensional Newton's Method 4.30

• Though not among the most popular, your Fun Fact now rates: Rising Sequences in Card Shuffling 4.00

See a random Math Fun Fact. Also available are a list of recent Math Fun Facts, or a list of all Math Fun Facts.