See also the Math Forum's Internet Mathematics Library list of math problems and puzzles on the Internet, and our Teacher2Teacher FAQ: Tricks for Learning Math.

      Calculation Tips

Doing Math in Your Head
	Beat the Calculator - BEATCALC!   More than 600 mental calculation tricks from the BEATCALC mailing list

	Divisibility Rules for numbers 3-13   Why do these rules work?
	Multiplication Tips   Hints for multiplying by 5, 9, 11, and 16
	Another Multiplication Tip   How to multiply two 2-digit numbers that share the same tens digit

      Math Problems

Russian Math Olympiads
	St. Petersburg, Russia   20 problems from the Palace of Youth Creativity
	Vologda, Russia   28 problems for grades 5-11

MathPro Online
	MathPro Online Reference to Mathematical Problems

      Math Puzzles

rec.puzzles
	rec.puzzles   An archive of questions and answers that may be of interest to puzzle enthusiasts
Number & Line Puzzles
	Number Puzzles   2007 Puzzle | 2006 | 2005 | 2004 | 2003 | 2002 | 2001 | 2000   1999 | 1998 | 1997 | 1996 | Four 4's Puzzle
	Math Line Puzzles   Join the dots | Rosebush Puzzles | M Puzzle | Toothpick Puzzle

Exploring Facts, Uncovering Connections
	Critical Thinking Puzzles   Brain teasers from Michael DiSpezio's book