## Mathematical Recreations

 MathRec Home Last Month's Topic Introductory Problem Educational Resources Steve's Personal Page

The previous topics are:

 January 2010 Airplane on a Treadmill March 2009 Sudoku Variants December 2003 Area of a Polygon July 2003 Duck Hunt March 2003 High Card Wins January 2003 Interstellar Travel June 2002 Crossing the Street ("dimensionless" equations and Poisson statistics) May 2002 The Integers April 2002 The Memory Game (Concentration) March 2002 Patterns in a2 + b2 = c2 February 2002 Generalized Wigner-Seitz Cells January 2002 Tic-Tac-Toe December 2001 The Massive Spring November 2001 K7 on the Torus October 2001 Distribution of Smarties

If you're itching for more, then I have some suggestions:

• Come up with a problem and send it to me at . I have run through much of my backlog of topics that I want to write about. I want to know what other people find interesting.
• Visit Michael Shackleford's site at mathproblems.info. I've done the first 120 problems on that site, so feel free to e-mail me about any of them.
• Visit NRICH. They are an educational organization, and have a wide variety of content appropriate for grade school through high school (and into college). In addition, they have a number of puzzles worthy of adults with math degrees. If you are an educator, you might want to note that you can browse NRICH by topic, such as Algebra/Inequalities/Quadratic. If you are simply looking for puzzles, they have a variety of problems each month for different educational levels. (Look in the index for the current magazine for the link labeled "Problems".) The problems in the 15+ Challenges section are often challenging and enlightening.
• If you enjoy problems that are best solved with programming techniques, the Euler Project at mathschallenge.net offers some fairly challenging problems with numerical answers. The main site has a library of problems requiring high school mathematics and also a collection of cipher challenges.
• Visit Nick's Mathematical Puzzles. This is another well-constructed site with a variety of puzzles with solutions.
• Try some of Paul Hsieh's puzzles. He has a variety, including classic paradoxes and some true puzzlers I haven't seen elsewhere. He gives hints, but not answers.