 The Annual Maritime Mathematics Competition  Department of Mathematics and Computer Science University of Prince Edward Island, Canada
Consisting of six challenging, high schoollevel math problems requiring written solutions, this competition seeks to foster interest in mathematics, increase public awareness of mathematics, and encourage students to develop mathematical and problemsolving
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 APICS Mathematics Competitions  Atlantic Provinces Council on the Sciences
Download PDFs of competition guidelines or of recent APICS Mathematics Competitions in French or English. Link to competitions dating back to 1978.
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 Aquí Matemàtiques (Catalán)  Carlos Romero
Web and interactive materials in Catalán designed to facilitate and improve teacher training in mathematics. Goals: to provide curricular incentives for integrating technology into primary and secondary level teaching; facilitate access to curricula;
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 Arbelos Internet Math Society  Bert Liberi and William F. Widulski, Westchester Communtiy College
A mathematics society dedicated to the pursuit of elegance in problemsolving. Every month, solve challenging problems that require "more imagination than memorization." Also, access old problems and solutions; and study a list of heuristics of problemsolving,
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 Bedtime Math  Appropriate Challenge for Every Student Foundation
"A nightly math problem to get kids fired up about math in their everyday lives." Each story puzzle has three variations: one for "big kids," one for "little kids," and one for "wee kids." Posts, which date back to February, 2012, have included "XRay
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 Beestar.org  Beestar Educations, Inc.
Providers of curriculumbased online programs for students, such as Beestar Progressive Exercise (BPE), a "systematic knowledge application and skillpractice program." See, in particular, the weekly math program; and dozens of freely downloadable sample
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 Brilliant
Weekly Olympiadstyle challenges that offer "rigorous, competitive, whimsical, and edifying" problem sets in math and physics. Register to explore the Brilliant Techniques Trainer's practice exercises; answer correctly to earn points redeemable for lanyards,
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 Carré d'As  Carré d'As
Mathématiques amusantes pour vous détendre: questions et solutions, challenges, la question des champions (qui sera remplacée quand 20 internautes auront réussi à trouver la solution avec une démonstration correcte dès le premier essai), et 229 questions
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 Centre for Education in Mathematics and Computing (CEMC)  Faculty of Mathematics, University of Waterloo, Canada
Home of the Canadian Mathematics Competitions (CMC); the Canadian Computing Competition; and contests for middle and high school students. Download PDFs of contest problems dating back to 1997. Register, obtain results from the competitions, participate
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 Chaoscope  Nicolas Desprez
Software to render 3D strange attractors such as IFS, Julia, Lorenz, and pickover. Browse the gallery, participate in the monthly contest, check the freeware's manual, learn from tutorials. Also available at http://www.btinternet.com/~ndesprez/.
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 ClassZone  McDougal Littell, Publishers
In ClassZone, McDougal Littell has gathered together all of its activities, interactive online resources, research links, chapter quizzes, and other materials that support its popular middle and high school mathematics textbooks, such as Integrated Math
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 Cmathématique  Téléfiction
Liens à consulter classés par sujet et par niveau; des problèmes du mois, un concours pour l'honneur dont les meilleures solutions de participants seront publiées sur le site; des capsules "crack" mathématiques offrant
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 Coffee Hour Problem of the Week  Matthew McMullen
Classic and "found" problems, as well as original challenges, in number theory, logical reasoning, statistics, calculus, geometry, and algebra. McMullen has posted PDFs of the PoWs, as well as their solutions, since 2007.
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 Collaborative Mathematics  Jason Ermer
Videos for connecting "a worldwide community of mathematical problem solvers" and "cultivating a productive attitude toward challenging problems: one of creativity, resourcefulness, selfconfidence, and perseverance." Two and threeminutelong challenges
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 Columbus State University Math Contest  David Rock and Doug Brumbaugh, College of Education, Columbus State University
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.
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 Desafios Matemáticos  Paulo Ferro
Cinco desafios novos cada mês. Ferro, um professor de matemática licenciado pela Universidade de Coimbra, tambem oferece demonstracões de geometria dinâmica, jogos matemáticos, biografias de matemáticos, exames
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 DevApprentice: Software Developer Apprentice  Kent Griffin
An online resource for learning elementary computer programming. Write and execute real programs, including graphics, in your web browser. Includes a programming problem of the week, examples, instructions, a glossary, and the online programming environment.
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 Discrete Math Problem of the Week (PoW)  Math Forum
Discrete math problems from a variety of sources, including textbooks, math contests, NCTM books, and puzzle books, and reallife situations, designed to reflect different levels of difficulty. From 1999 until 2002, this service challenged students with
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 doyourmath.com
Interactive practice and learning tests (PreSAT, SAT, AP and Calculus), math puzzles, entertaining math for all ages, a math bookstore, and a math expert to answer your questions. Submit your answers to the puzzle of the week and see the archive of past
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 Dr. Rich's Page o' Math
Math problems in algebra, trigonometry, and calculus, posted more or less monthly (past puzzles, with solutions, are on the Web).
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 Elementary Problem of the Week  Department of Mathematics, Southwest Missouri State University (SMSU)
Word problems in number patterns, algebra, geometry, and other topics. Read the solution to the most recent problem, and archives of previous problems and their answers.
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 Elementary Problem of the Week  Math Forum
A project designed to challenge elementary students with nonroutine problems and to encourage them to verbalize their solutions. From 1995 to 2002, solutions submitted from students for the Elementary Problem of the Week were answered by Visiting Math
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 ESCOT (Educational Software Components of Tomorrow) Problems of the Week  Math Forum
An interactive problem of the week service offered from 1999 until 2001. ESCOT is an NSFfunded research grant that developed interactive Java applets to help middle school learners understand typically difficult math concepts, for example, fractions
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 Everything Is Mathematical  RBA Contenidos Editoriales y Audiovisuales S.A.
Based on the series of books, published weekly in association with The Times and presented by Marcus du Sautoy, which aims to demonstrate clearly how mathematics shapes the world around us. Blog posts, which date back to September, 2012, have included
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 Fermi OfftheWall Math League  Karen Newell, Intermediate District 287, Plymouth, Minnesota
A Fermi question is posed with limited information given, and requires that students ask many more questions; for example, "How many water balloons would it take fill the school gymnasium?" ("What are the approximate dimensions of the gym?") Register
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 High School Problem of the Week  Department of Mathematics, Southwest Missouri State University (SMSU)
Word problems in number theory, logic, algebra, analytic geometry, and other topics. Read the solution to the most recent problem, and archives of previous problems and their answers.
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 hs.Beestar.org  Beestar Educations, Inc.
Providers of curriculumbased online programs for high school students, such as Beestar Progressive Exercise (BPE), a "systematic knowledge application and skillpractice program." See, in particular, the weekly SAT math and advanced SAT math programs.
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 Inside Mathematics
Classroom examples of innovative math teaching methods, insights into student learning, and instructional tools ready for immediate use. Adopt a schoolwide problemsolving theme with Inside Mathematics' Problems of the Month, each featuring video overviews,
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 Internet Math Challenge  Dept. of Mathematics, University of Idaho
A weekly K12 math challenge from the math department at the University of Idaho, discontinued in 2004. Past puzzles and solutions are available.
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 Internet Math Hunt  Math Forum
The Internet Math Hunt consists of questions about math and mathematicians. The answers can be found somewhere on the Internet. Answers should be in three parts: 1. What did you find? 2. What is the URL (address) where you eventually found the information?
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 jackmathsolutions.com  Jack Koenka
Freely download individual chapters of the AP Calculus AB textbook coauthored by Koenka and Roger Allen. Download problem of the week documents, sample test and assignments, notes, worksheets, and other instructional resources. Koenka invites students
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 KappAbel  Roald Buvig
Problems from a competition open to pupils in 8th grade in Sweden, Finland (including the Aaland Islands), and Denmark (including Greenland and the Faroe Islands), and ninth graders in Iceland and Norway. See, in particular, the English language weekly
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 Ken's Puzzle of the Week  Ken Duisenberg
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
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 KeyedIn Magazine  nelsonthornes.com
Weekly puzzles, quizzes, features of great mathematicians, fun with numbers, and strategy games. An Internet quest and "the serious stuff" offer selfscoring problems. Teacher resources provide links and ideas for each chapter of the Nelson Thornes Key
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 Korespondenční seminář  Ansa Lauschmannova
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 ("actual series") about once a month, along with commentary.
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 Lateral Puzzles  Paul Sloane
Pose or solve lateral thinking puzzles, also known as situation puzzles, which depict a counterintuitive scenario to be explained by asking yesno questions or by proposing explanations. Read questionandanswer conversations of current and solved puzzles;
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 Lessons (Dan's math@home page)  Dan Bach and B & L Math Enterprises
Short descriptions of math subjects: arithmetic; prealgebra; beginning and intermediate algebra; trigonometry; functions and graphs; limits; differential, integral, and vector calculus; linear algebra; differential equations; statistics; geometry; number
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 The Little Math Puzzle/Le Petit Problème  Royal West Academy and Canada's SchoolNet
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
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 Living Maths HQ  Living Maths
Begun in 1995, this math olympiad has grown from a syllabus for one bright young student into a weekly challenge for thousands of South African learners.
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 Logicville
Anagram, chess, cryptarithm, cryptogram, doublet, logic, mathematical, magic word square, and tangram puzzles. Select a puzzle at random; solve the puzzle of the week. Interactive puzzles require Java.
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 Macalester College Problem of the Week  Stan Wagon; The Math Forum
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
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 MathBlues.com  Rafiq Ladhani
Stepbystep explanations and worked problems "all about the new SAT." Browse the weekly articles by topics such as algebra, trigonometry, geometry, statistics, and "math art." This SAT preparation site for students also includes message boards, weekly
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 Math Challenge  Whitehousekids.gov
A new challenge is posted each Monday for students in elementary, middle, and high school. Type in your numerical answer, and the site checks it for you. Also see the Open Challenge and the archive of past problems, which date back to August, 2004, and
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 MATHCOUNTS  MATHCOUNTS Foundation
A national math coaching and competition program that promotes 7th and 8th grade math achievement through grassroots involvement in every U.S. state and several territories. At the beginning of each school year, the MATHCOUNTS Foundation distributes,
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 Math Education  University of Central Florida (UCF)
Weekly contests; activities; course descriptions, syllabi, class notes; instructor homepages; links to math education resources about problem solving, software, calculators, math games, textbooks, the Internet, and the UCF/Casio classroom.
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 Mathematics by Mr. P  Mike Poliquin
Middle school math teacher Poliquin began this blog, subtitled "making sure everyone gets it," in December, 2011. Posts have included various original problems of the week; "Eudoxus of Cnidus: the First Mathematical Superstar"; "A Quick Dip in the Deep
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 Mathematics Center  Houghton Mifflin Company
K12 instructional materials and special offers. Online support for Math Central textbooks includes links, activities, and printable blackline masters. Weekly and archived Brain Teasers for grades 34, 56, and 7 and later. Data Place allows 36 grade
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 Mathematics Department  SUNYStony Brook
About the department, its people, and their research; resources for undergraduate and graduate students (includes the problem of the month); IMS (Institute for Mathematical Sciences) Preprint Server; and the Dynamical Systems Page (including addresses,
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 Mathematics Pentathlon  Pentathlon Institute
A program of interactive problemsolving games, supportive curricular and instructional activities, and assessment tools for students in grades K7. This motivational program strengthens basic math concepts and skills, aligns with national and state mathematics
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 Mathematics Resource Center  Brooks/Cole Publishing Company
Brooks/Cole publishes textbooks and technology products for the entire range of mathematics courses, from Arithmetic, Calculus, and Differential Equations, to Numerical Analysis, including texts previously published by PWS. The site provides an array
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