 Maps of Many Colors  Ivars Peterson (MathLand)
The 4color map theorem: are four colors always enough to fill in every conceivable map that can be drawn on a flat piece of paper so that no countries sharing a common boundary are the same color? A single shared point doesn't count as a shared border.
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 Marcy Cook Math  Marcy Cook
Cook offers mathematics inservice workshops for elementary, middle, and junior high school teachers and administrators. She has written numerous books for classroom teachers, as well as sets of tiling and task cards for use in the classroom, and manipulatives
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 Marius Kempe
Kempe's activities consist of photos of a manipulative or geometric drawing, each captioned with brief instructions and a question. "Writing" includes a guide to the errata for Weyl's Symmetry; as well as translations of Pólya's "On the analog
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 Mark Tomforde's Website
Home page of a University of Houston math professor who focuses on functional analysis, "examining algebraic questions motivated by analysis and also studying algebras that are related to C*algebra." Tomforde maintains a repository of open problems for
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 Mark Wahl Math Learning/Teaching Resources
Math methods and activity books written by Mark Wahl for teachers, homeschoolers and parents (especially grades 39), as well as information on Wahl's customized teacher or parent workshops and conferences, and some math and education links. Specialties:
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 MarrowMaths  Jan Vermeulen
Worksheets with problems for middlegrades students to solve. Oddnumbered pages are freely downloadable; evennumbered pages are feebased. One module exists at present (properties of numbers and calculations), with six more planned.
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 Martian (and Other Extraterrestrial) Math  American Museum of Natural History (AMNH)
Questions about the Earth, the Moon, and the planets, with hints and answers. How far are you from the center of the Earth? What is the radius of the Moon's orbit? How many Earths would fit end to end across the orbit of the Moon? How much does the rover
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 Martin Gardner's Lucky Number  Ivars Peterson (MathTrek)
Hunting for prime numbers, those evenly divisible only by themselves and 1, requires a sieve to separate them from the rest. For example, the sieve of Eratosthenes, named for a Greek mathematician of the third century B.C., generates a list of prime numbers
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 Massachusetts Comprehensive Assessment System (MCAS)  Massachusetts Department of Education
Test schedules, test items from prior years, scoring guidelines and student work on openresponse questions, results of this state standardized testing, and performance appeals. Publications include questionnaires administered to students, interpretive
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 MasterMathMentor.com  Stu Schwartz
Quizzes, exams, exam prep, and other calculus and precalculus materials from an Advanced Placement (AP) Calculus and Statistics teacher of 35 years and Presidential Awardee for Teaching Excellence. Schwartz's materials for sale include "Calculus: Ripped
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 MAT 007 I News, Wreckreational Math  Joel Chan, Ed.; Dept. of Mathematics, Univ. of Toronto, Canada
A newsletter that combines mathematics and humour, with articles that range from the very serious and informative to the witty and hilarious. The ultimate goal of the newsletter is to bring you some enjoyment in mathematics that you might not be able
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 Match Sticks in the Summer  Ivars Peterson (MathLand)
One of the presenters at the Strens conference was mathematician Heiko Harborth of the Braunschweig Technical University in Germany. "Match sticks are [among] the cheapest and simplest objects for puzzles which can be both challenging and mathematical,"
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 Matematicamente.it  Antonio Bernardo and Marcello Pedone
Esercizi svolti, raggruppati per argomenti; appunti di analisi; test di matematica, per le medie superiori; tesine maturità agli esami di stato; ingresso superiori; approfondimenti, spunti e idee per insegnanti e studenti; misura il Quoziente di
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 Matematica Online  Dragos Constantinescu, Romania
The official page of National Math Olympiad of Romania. Contents: problems for math contests, news concerning Romanian math, problems for exams, links to math pages, puzzles etc. For the moment, the page is written in Romanian, but in the future, the
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 Matematicas recreativas, Juegos, Logica, Ingenio, Matemáticos, Magia  Eduardo Ochoa
In Spanish, recreational mathematics puzzles: Matemáticas Recreativas, Juegos, Lógica, Ingenio, Matematicos, Cuentos, Acertijos, Magia.
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 A Matematica, um ABC do xyz: Professor Cardy  Cardy Meier
In Portuguese, lessons, articles and games primarily about algebra and geometry (including projective geometry).
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 Matemática Recreativa  Renato P. dos Santos
A site designed to entertain visitors, to challenge ordinary people to have fun with Math, and to offer selected problems that appeal more to problemsolving than algebra. In Portuguese.
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 Matemáticas  Antonio Pérez
Si estás interesado en las Matemáticas, si eres profesor, estudiante, o simplemente sientes curiosidad, esta página te puede ayudar. Didáctica e Historia de las Matemáticas; Curiosidades en Internet. Problems, puzzles,
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 Matemáticas básicos para niños  J. A. Cordero
La resolución de problemas, no solo de ejercicios, es la parte fundamental del aprendizaje de las matemáticas básicas. Los problemas implican una pregunta que no se sabe responder con los conocimientos inmediatamente disponibles.
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 Matemáticas de Bachillerato  AuladeMate.com
In Spanish: Selectividad Exámenes Resueltos Matemáticas de Bachillerato.
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 Matemáticas Educativas  Juan Ubeda
Portal dedicado a las matemáticas a nivel educativo: biografías, aplicaciones didácticas, apuntes, problemas, profesor virtual, recortes de prensa, juegos on line, programación, enlaces, etc.
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 Matemática Virtual  Mariam del Mar Correa
Página dedicada a las matemáticas donde puedes encontrar consejos para superar el miedo a las matemáticas, estrategias para resolver problemas, fórmulas, cultura matemática y test de inteligencia.
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 Matesfacil  Jose Llopis
Ejercicios resueltos de matemáticas: potencias; binomio de Newton; productos notables; ecuaciones de primer e segundo grado; ecuaciones bicuadradas, logarítmicas, exponenciales, y irracionales; geometría plana; ruffini; progresiones;
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 Math24.net  Alex Svirin
Hundreds of calculus problems solved, stepbystep: limits and continuity, differentiation, integration, sequences and series, double integrals, triple integrals, line integrals, surface integrals, and Fourier series.
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 Math500.com  Joe Cunningham
Selfguided problems to solve with automated feedback based on the strategy you select from among the multiple choices presented at each step, or upon the intermediate calculation you enter. Worked examples provide additional stepbystep support. Choose
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 MATHabundance  Johan Claeys
An uppersecondary math tutorial, with topics in order, each building on the previous topic. Includes solved and unsolved problems and links to other tutorials, problems, and math sites.
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 Math Advantage  Harcourt Brace School Publishers
Java and Shockwave activities (for individual or cooperative group work), sorted by grade level (K through 8); and parent/teacher features within each activities list, with further activities. The main site, the Learning Site, also offers parent and teacher
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 Math Adventures  George Gadanidis
Site for MathMania magazine, published four times yearly. It was originally published from 19891992, and was revived in 1999. February and April issues from 1999 are available free. The site also offers activity books, games, software, and a book on
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 Math Alive  Ingrid Daubechies, Princeton University
Materials from a course designed for those who have not had college mathematics but would like to understand some of the mathematical concepts behind important modern applications. Interactive "virtual labs" address cryptography; error correction and
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 Math and ProblemSolving  Dan Rosard
This site offers help with procedures, particularly in areas which have been observed to cause problems to some students; and unstructured problems with clues and questions. The first problem attempts to emulate the thinking used in the development of
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 Math and Science: Recommended Books (Natural Math)  Maria Droujkova and Dmitri Droujkov
An annotated list of books in alphabetical order by author, selected because they are pleasant to read, have valuable math or math education content, are respectful to students, and are accessible to a broad audience. Books may be purchased online through
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 Math and the Art of M. C. Escher  Anneke Bart and Bryan Clair with Steve Harris, Saint Louis University
Online materials covering Euclidean and nonEuclidean geometry as well as some other topics. It is intended to support a mathematics course at the level of college algebra, with topics taken from the mathematics implied by Escher's artwork. The website
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 MathArguments180.com
Subtitled "180 Days of Ideas for Discussion in Math Class," this blog of prompts dates back to January, 2014 with posts such as "Improperly Canceling Fractions," "Order of Operations is Wrong," and "Why 360?"
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 MathAThon  St. Jude Children's Research Hospital
Students participating in a MathAThon obtain sponsors and earn prizes by completing "funbooks" of math problems such as hidden messages, puzzles, and pure arithmetic operations. Proceeds from this supplemental math program build an endowment fund to
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 Math Awareness Month (MAM)  Joint Policy Board for Mathematics (JPBM)
Mathematics Awareness Month  formerly Math Awareness Week (MAW)  is held each April to increase public understanding of and appreciation for mathematics. Since 1991, yearly themes and activities at the local, state, and regional levels have included
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 mathbabe  Cathy O'Neil
"Exploring and venting about quantitative issues." Blog posts, which date back to June, 2011, have included "KNearest Neighbors: dangerously simple," "Cool math books," "Women in math," "Mathematicians know how to admit they're wrong," and "Why log returns?"
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 Math Basics
Online drills in the four basic operations (addition, subtraction, multiplication, division), using adaptive practice so that only the problems still giving trouble are repeated.
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 Math Basics (1,2,3 ... to PreAlgebra)  Kids Gotta Learn
A subscriptionbased online service offering assessment tests for basic math skills, and worksheets addressing those areas. Topics are listed on the site with sample tests and worksheets, and a video describes the product. Subscriptions are available
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 Mathbiz.com  Joseph Cunningham
Free interactive math problems. An "electronic tutor" gives you stepbystep instructions for each problem, which you must answer before proceeding.
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 Math Blaster  Knowledge Adventure, Inc.
Hub for the Math Blaster outer spacebased Massively Multiplayer Online (MMO) game. Free math resources include activities, practice, worksheets, and problems.
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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 Camp  Ivars Peterson (MathLand)
For four weeks [in 1996], 98 students housed at the University of Washington (Seattle, WA) mixed mathematics with field trips, tennis, swimming, volleyball, and a host of other activities. It was a unique summer camp that kept them busy listening to lectures,
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 MathCaptain  mathcaptain.com, Inc.
Chat tutoring services in algebra, geometry, trigonometry, calculus, number systems, and statistics. With free online primers and solved examples.
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 Math Cats  Wendy Petti
A site for children that promotes openended and playful explorations of important math concepts, and more serious reflection on topics such as Hurricane Katrina. Start with the magic chalkboard, then enter Math Cats MicroWorlds (interactive projects);
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 Math Celebrity  Don Sevcik
Free online calculators and instructional screencasts in actuarial science, accounting and taxes, algebra, basic math, calculus, capital budgeting, conversions, discrete math, economics, engineering, finance, gaming, geometry, linear algebra, physics,
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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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 Math Club  Mary Kathryn Eisemann, Tomasz Jan Klosowski, Micjal Andrzej ZabickiThinkQuest 2000
Brief tutorials, puzzles, and brain teasers for students aged 1217. Some topics include: equations, trigonometry, geometry, set theory, logic, and induction. The games range from mazes to magic squares to Victorian parlor games. Students may log in
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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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 MathCracker.com
Online solvers and graphing tools to create scatter plots, calculate mean and standard deviation, and draw pie charts on the web. MathCracker.com also provides statistics tutorials, lessons, and worked math problems, solved step by step. See, in particular,
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 Math Day  University of NebraskaLincoln
An annual "day of fastpaced mathematics" for high school students hosted by the University of NebraskaLincoln's Department of Mathematics since 1990. See multiplechoice and essay problems from the individual competition, named PROBE ("Problems Requiring
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