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Elementary Level  Middle School Level  High School Level  College Level 
Hosted at the Forum
2006
Mathematics Game Use the digits in the year 2006 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 doubledigit 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 firstyear college students, so very little background is needed to understand or solve them. 
ABACUS
International Math Challenge  Grace Church School The ABACUS International Math Challenge is open to students in three categories (grades 34/ages 910; 56/ages 1112; 78/ages 1314), 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 48. 

AP
Calculus Problem of the Week  Mr. Kelley A problem of the week 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 everyotherweek math challenge for grades K3 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 email 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 Collegelevel 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 34, 56, 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, nocalculus, weekly contest problem to test your skills. 

Internet Math
Challenge A weekly K12 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 currenteventsbased math problems. Also includes warmups and workouts, problem solving strategies, extended activities, algebraic reasoning, and a contest for submission of creative math problems. 

Math
Magic  Erich Friedman A site devoted to original mathematical recreations. If you have a math puzzle, discovery, or observation, you are invited to email 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 math curriculum for K6 in Manitoba for grade one, grades two and three, grade four, and grades five and six. 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. 

Monthly Problems
 NRICH Maths, Univ. of Cambridge Problems from the NRICH Online Maths Club. Past problems are archived by month 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 57, 711, 1114, 1416 and 1618, and indicate that students in the UK normally meet the maths required during that key stage. 

Monthly
problems  Mathematics Problem Solving Task Centres 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 email list helps teachers and students communicate about problem solving. Links to other problemsolving sites, and an extensive reference section. 

Physics and
Calculus Problems of the Week (PCPOW)  Kentridge High School, Kent, WA A contest featuring problems in physics 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 collegelevel mathematics, typically calculus, but occasionally higherlevel courses. Challenge: this page does not presuppose a knowledge of collegelevel 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  U.S. Military Academy A current collegelevel 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. 

PyMath  CSAM Inc.,
Bettendorf, Iowa Math problems, a challenge for grades 35. The problems include every level of math knowledge, from easy to challenging, and at the end of the school year, gifts, trophies, and certificates are awarded. See also the comprehensive list of Math Programs and Summer Math Camps in the US, and the Py Math game, in which a threedimensional pyramid is built using wooden game pieces. 

The
Quantum CyberTeaser  National Science Teachers Association (NSTA) A bimonthly problem posed online by Quantum, the math and science magazine. 

Saxon Publishers' Math Enrichment Biweekly problems for primary, middle, and upper grades, with Math Stumpers for even more advanced topics. With the exception of the stumpers, students may submit answers, and there is no archive or published solution. The Stumpers include posted solutions. 

Shepherd College Problem of the Week Contest Challenging high school level problems and more simple college level problems open for all to solve, with prizes for the most proficient problemsolvers. 

Sterling
Crockett's Problem of the Week Every week, Crockett sends a math problem to a mailing list, welcomes solutions, and then at the end of the week posts the problem online. Most problems entail geometry, graph theory, combinatorics, or probability; some, algebra and number theory. 

University
of Central Florida/University of Mississippi/Casio Contest Page A problem contest offered weekly by the Casio Classroom (a joint venture of the University of Central Florida and the University of Mississippi). There are elementary, middle, and high school levels, as well as a more general problem of the week. Students submitting correct answers are entered in a drawing for a scientific calculator. Previous problems are archived, but without solutions. 
Elementary Level  Middle School Level  High School Level  College Level 