Other Interesting Problem Sites

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Hosted at the Forum

	KenKen® at the Math Forum In collaboration with Nextoy®, the Math Forum @ Drexel is offering a KenKen® Puzzle collection. KenKen® is a number puzzle that is related to Sudoku, but even more mathematical.
	2012 Mathematics Game Use the digits in the year 2012 and the operations +, -, x, ÷, ^ (raised to a power), sqrt (square root), and ! (factorial), along with grouping symbols, to write expressions for the counting numbers 1 through 100. This year we will also allow the use of decimal points and double-digit numbers. You may use the digits in any order, but the order 2, 0, 1, 1 is preferred.
	Technology Problems of the Week (tPoWs) These challenges are modeled on The Math Forum's Problems of the Week and take advantage of interactive mathematics tools such as spreadsheets, Java applets, The Geometer's Sketchpad®, Fathom™, TI-Nspire™ and more.
	Macalester College Problems of the Week Stan Wagon, a professor in the Mathematics and Computer Science Department at Macalester College, poses a mathematics problem to his students every week. The problems are meant to be accessible to first-year college students, so very little background is needed to understand or solve them.

Hosted Elsewhere

	ABACUS International Math Challenge - Grace Church School The ABACUS International Math Challenge is open to students in three categories (grades 3-4/ages 9-10; 5-6/ages 11-12; 7-8/ages 13-14), with 8 problems posed each month. The challenge begins in September and ends in April. It originated with the ABACUS Math Challenge started 5 years ago in Hungary by Sándor Róka, for students in grades 4-8.
	AP Calculus Problem of the Week - Mr. Kelley A problem of the week that ran from 1998-2003 and is now running again in 2011-2012 designed to help in studying for the AP Calculus Exam.
	Aunty Math - DuPage Children's Museum An every-other-week math challenge for grades K-3 from "Aunty Math." Each challenge is presented in the form of a story taken from the life of Aunty Math, her two nephews, and her niece. Students with questions or suggestions can e-mail Aunty Math directly, and a tips for the Current Challenge page provides suggestions for modifying or extending each problem. Students may also submit solutions and read what others have written from Aunty Math's Solutions page, and there are also recommended problem solving strategies described on the kids' "Find out about the challenge" page.
	Bradley University Problem of the Week College-level problems, posted weekly for the current semester by Professor Alberto L. Delgado, with archives of problems and solutions starting in spring 1997, for number theory, combinatorics, probability, calculus, etc.
	Coffee Hour Problem of the Week Download PDFs of classic and "found" problems, as well as original challenges, in number theory, logical reasoning, statistics, calculus, geometry, and algebra.
	Dan's math@home Problem of the Week A challenging, puzzling, no-calculus, weekly contest problem to test your skills.
	The Handley Math Page David Pleacher posted Problems of the Week in his classroom every week since 1968, and posted them online—with solutions and names of students who correctly solved them—from 1998 until his retirement in 2006.
	Internet Math Challenge A weekly K-12 math challenge from the math department at the University of Idaho, discontinued in 2004. Past puzzles and solutions are available.
	Ken Duisenberg's Puzzle of the Week A weekly puzzle for advanced high school or college level, with a math, geometry, or game focus. The problems are easy to understand but tricky to solve. An archive of previous problems and solutions is included, together with a list of other puzzle sites Ken has enjoyed visiting.
	Korespondenční seminář A correspondence seminar intended for high school students and run by the students of the Faculty of Mathematics and Physics at the Charles' University in Prague. There is a new set of problems about once a month. Available in English and Czech.
	The Latin School of Chicago Middle School Problem of the Week - Tom Canright Math and logic puzzles—many original, some reproduced from sources such as NCTM journals—with solutions presented in accompanying videos.
	The Little Math Puzzles Weekly puzzles posted to Canada's SchoolNet Listserv, intended to be an Internet icebreaker activity for a wide range of classrooms. Inspired by The Great Canadian Trivia Contest, these puzzles are designed for students in grades 5 through 10 and usually have a Canadian context. In English and French, with an archive of past puzzles.
	MathCounts Featuring a Problem of the Week contest, with archive, of current-events-based math problems. Also includes warm-ups and workouts, problem solving strategies, extended activities, algebraic reasoning, and a contest for submission of creative math problems.
	Math Challenge - White House Kids Type in a numerical answer to the Elementary, Middle, or High School Problems, as well as to the Open Challenge, and the site checks it for you. Past problems also available with interactive answer-checking.
	Mathematics Problem Challenge - William P. Wardlaw, Mathematics Department, United States Naval Challenging problems in calculus, probability, geometry, and other topics. Browse the archives for web pages and .txt files of this challenge, which ran periodically between 1998 and 2003.
	Math Magic - Erich Friedman A site devoted to original mathematical recreations. If you have a math puzzle, discovery, or observation, you are invited to e-mail the author. You can also submit answers to the problem of the month; questions and solutions are archived. Examples include: Divisor Chains; Integer Square Tilings; Angle Frequencies; Disconnected Polyominoes; Average Arrays; Convex Spectra; Surround Numbers; Palindrome Products, Fairy Chess Endgames, and Rectangles in Squares.
	Weekly Problem - NRICH Maths, Univ. of Cambridge Problems from the NRICH Online Maths Club. Past problems are archived in the Resource Bank. Each problem has a symbol indicating the stage, which tells you how little or how much mathematics you need to know to solve the problem but is no indication of its difficulty. The five stages correspond to ages 5-7, 7-11, 11-14, 14-16 and 16-18, and indicate that students in the UK normally meet the maths required during that key stage.
	Problem Corner - Les Reid; Southwest Missouri State University (SMSU) High School, Advanced, and Challenge problems, updated monthly.High School: solutions are not solicited, although feedback is appreciated. Each month, the solution to the previous month's problem is posted, along with the names of high school students who have solved it (names to be submitted by teachers). Advanced: problems that assume some college-level mathematics, typically calculus, but occasionally higher-level courses. Challenge: this page does not presuppose a knowledge of college-level mathematics, but the problems posed tend to be of a more challenging nature. Solutions are solicited. At the advanced and challenge levels, solutions are solicited and the names of those solving the puzzle are posted monthly along with one solution.
	Problem of the Week - Purdue University A panel in the Mathematics Department publishes a challenging problem once a week and invites college and pre-college students, faculty, and staff to submit solutions.
	Problem of the Week - U.S. Military Academy A current college-level Problem of the Week, with links to past problems and solutions, a project of the Pi Mu Episilon chapter of the United States Military Academy. MathCad or Word are needed to view past problems and solutions.
	The Quantum CyberTeaser - National Science Teachers Association (NSTA) A bimonthly problem posed online from 1995-2001 by Quantum, the math and science magazine.
	Saxon Publishers' Math Enrichment Problems Grade-specific enrichment problems and even more challenging Math Stumpers.
	Weekly Problem - Julien Santini, France Download PDFs of one high school and one college-level problem every week.
	Yummy Math - Brian Marks and Leslie Lewis Topical math activities that relate to happenings in our world. PDFs, Microsoft Word documents, and Excel spreadsheets have offered prompts and tables on topics ranging from the oil spill in the gulf to the Academy Awards; from the Super Bowl to the Chilean mine rescue; from March Madness to American Idol.

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