Minute Math Talk

References and Additional Information

Mental Magic, Quadratic Formula Inside Out
Uncommon Math Excursions
Four 9s Puzzle
Howard Eves, "Hail to thee, blithe spirit!", Fibonacci Quarterly, 19 (1981) 193-196.
Sum Formulas for Sine and Cosine
"Sum Formulas for Sine and Cosine", Two-Year College Math Journal, 14 (1983)  55-56.
Josephus Problem
Wikipedia Article
Odd Entries in Pascal's Triangle
Wolfram Alpha article
Cute Li'l Theorem
Uncommon Math Excursions
Marden's Theorem
Most Marvelous Theorem in Mathematics JOMA article.