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Hosted at the Forum

	2007 Mathematics Game Use the digits in the year 2007 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.
	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™, 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 to help in studying for the AP Calculus Exam, rated by difficulty, with an archive of past problems.
	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.
	Brain Teasers - Houghton Mifflin's Education Place Mathematics Center Math puzzles for grades 3-4, 5-6, and 7+. Each question lists hints, and is archived with solutions when the original week is over.
	Dan's math@home Problem of the Week A challenging, puzzling, no-calculus, weekly contest problem to test your skills.
	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 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.
	The Math Problem Page Weekly questions revolving around the first grade math curriculum for Manitoba. Solutions appear the following week, listing by first name only the students who have anwered correctly. Offered all year long, including summer months, since 1999.
	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.
	Monthly problems - The Mathematics Association of Victoria (Australia) A site devoted to all aspects of math problem solving. Includes problems of the month for lower primary, upper primary / lower secondary and upper secondary students; also a "Challenging problem of the month." All have archived solutions. An e-mail list helps teachers and students communicate about problem solving. Links to other problem-solving sites, and an extensive reference section.
	PCPOW (Probability/Statistics and Calculus Problems of the Week) - Kentridge High School, Kent, WA A contest featuring problems in probability, statistics, and calculus, posted the first and third Mondays of each month.
	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 - Iowa State University of Science and Technology Download PDFs of challenging problems in number theory, abstract algebra, graph theory, and other topics every Monday. Intended for undergraduate students enrolled at Iowa State University.
	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.
	Columbus State University Math Contest Problem of the Week, Algebra in Action, Middle School Madness and Elementary Brain Teaser -- all available in challenge mode. Past problems are archived, with solutions available upon request.
	Weekly Problem - Julien Santini, France Download PDFs of one high school and one college-level problem every week.

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