 The Monty Hall Problem  Math Forum, a Classic Problem from the Ask Dr. Math FAQ
Let's Make a Deal: If you're shown a goat behind the second of three doors, should you stay with your first choice or switch?
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 Moogie Math
Windows software designed to prepare students for the Ohio 4th and 9th Grade Mathematics Proficiency Test. Other states can also be accomodated (specifically, Texas, Florida, and Nevada). Downloadable and online demos. Includes ideas for funding resources
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 Moogie on the Net!  Joseph Emanuel, Emanuel Software
Commercial drill and diagnostic software where the numbers always change. Not meant to instruct students or to present them with new material, but rather, to help them learn the process of solving problems. Software aligned to national and numerous state
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 Morley's Pursuit of Incidence  Cut the Knot!, Alexander Bogomolny
With all the geometric context of his theory (applets are provided for explorations), Morley's method is purely algebraic, founded on the theory of complex numbers. Curves are mappings x = f(t) from the unit circle. x = X + iY, where X and Y are the plane
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 Morley's Redux and More  Cut the Knot!, Alexander Bogomolny
In 1998 Alain Connes  a French Fields medalist  published a new proof of Morley's theorem (the three points of intersection of the adjacent trisectors of the angles of any triangle form an equilateral triangle).
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 Mostperfect Pandiagonal Magic Squares  Kathleen Ollerenshaw and David Brée
A companion site to the book, which gives a method of construction and enumeration of all pandiagonal magic squares of a class known as Mostperfect. Pandiagonal magic squares have the integers in all rows, all columns, and all diagonals (including the
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 MOTIVATE  Univ. of Cambridge, UK
MOTIVATE is a project incorporating a series of videoconferences, run by the Millennium Mathematics Project at Cambridge. The objectives of MOTIVATE are: to enrich the mathematical experience of school students, to broaden their mathematical horizons,
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 Motivating Math  Robert Bunge
A math help site focusing on basic math through introductory algebra. Suitable for secondary students and adult learners. Includes tutorials, Javabased tools, and pedagogical ideas behind the presentation.
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 Mount Everest Math Puzzles  Paula Fleischer; Peachland Avenue Elementary School, Newhall, CA
Kids (or grownups) answer math questions and get passwords that allow them into 'camps' higher and higher on Mt. Everest until they reach the summit. At each camp they find photos of the mountain and climbers, and tackle progressively more complex math
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 M Puzzle: a Math Line Puzzle  Math Forum
Construct nine triangles by drawing three straight lines through a capital M. Questions, hint, solution.
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 Mr. Hoffman's Home Page  Jim Hoffman
Assignments, notes, exams and interactive vocabulary quizzes (with answer keys) from Hoffman's own math and twodimensional computer animation high school classes. These materials are based on Saskatchewan Provincial Curriculum, and include Math 9, Math
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 Mr. Kelley's AP Calculus Home Page  Mike Kelley
A teachermade site that allows students to answer middle and high school math questions from people all over the world. Also an archive of past problems of the week, rated by difficulty.
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 Mr. Martini's Classroom: Math Practice
Flash cards for drill. Press the check to select 5, 10, 25, 50, or 100 card selfevaluation. Miminum verbage to make it accessible to nonEnglish speakers. Works best with later versions of IE but should work well with W3C Mozilla based browsers.
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 Mr. Math Puzzler  Young Saint Louis.com
A regular feature from the monthly YoungSaintLouis.com. Postmark answers by the 15th of the month for recognition and the chance to win prizes such as gift certificates. Mr. Math Puzzler is Wayne Hesse, a math teacher at Green Park Lutheran School, who
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 Mr. Myers' Classroom  Nathan Myers
Read the puzzle of the week and then submit your answers online. Other "brain busters" include matrix logic puzzles, featuring readymade charts. Explore and identify fraction bars with JavaScript, or geometry with Java applets. Also, fact sheets and
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 Mrnussbaum.com  Greg Nussbaum
Mrnussbaum's Math Lab has games such as Tony Fraction's Pizza Shop; Smart Poll; Cash Out (for practice making change); and Tackle Math Ball, Math Speed, Buffalo Math, and Math Fries (all timed games for practice adding, subtracting, multiplying, and dividing).
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 Mrs. Cantey  Susan Cantey
Resources for precalculus and calculus, from a teacher at Walnut Hills HS in Cincinnati, Ohio. Advice, information, practice problems, quizzes, and more.
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 Mrs. Cortes' Teacher Resources  Aida Cortes
Colorful monthly math calendars, available in Spanish and English, for interactive white board use (Activeboard™ and Smartboard™). Each seasonally appropriate template, created by a first grade North Carolina teacher native to Colombia, includes
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 Mrs. Glosser's Math Goodies  Gisele Glosser
Interactive math lessons that work online and offline in a Web browser, and provide immediate feedback to students, with in addition Worksheets (on circumference and area; exponents; expressions and equations; integers; Ocean Math; order of operations;
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 Mr. Talbot's Mathematics Page  Roger Talbot; Detroit Catholic Central
Problem of the week (Algebra 2, Precalculus and Calculus), solutions to the 1999 AP Calculus BC Exam, and a selection of sample tests, quizzes, worksheets, labs, and links.
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 M@ths en Prép@  JeanMichel Ferrard; Lycée du Park, Lyon
Pour les élèves des classes préparatoires scientifiques, un abrégé du cours de mathématiques, une collection d'exercices et de problèmes corrigés, et une introduction à Maple. Math taught
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 Mudd Math Fun Facts  Francis E. Su; Mathematics Dept., Harvey Mudd College
A site developed as a resource for professors wishing to enrich their courses with mathematical 'fun facts': more than 100 5minute math tidbits that can be used at the beginning of class to get students interested in mathematics. They are best used in
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 The Mult Applet  Philip Lin
A Java applet for practicing multiplication tables. Tables from 2 to 9 are scrambled and displayed with blanks for the answers. Enter your answers; if you miss any, you get a chance to correct them. If you get them all right the first time, the applet
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 Multicultural Math Fair  Suzanne Alejandre, Frisbie Middle School
Twentynine percent of Frisbie's student population is Limited English Proficient; Arabic, Cambodian, Chinese, German, Indonesian, Korean, Philipino, Polish, Portuguese, Romanian, Samoan, Spanish, Taiwanese, Vietnamese, and Urdu are represented. In 199394
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 Multimagic squares  carrés multimagiques  Christian Boyer
Multimagic squares are magic squares that remain magic after their numbers are raised to various powers. The largest multimagic square currently known is BoyerViricel's pentamagic square, to the 5th power.
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 Multiplication of Decimals  H. B. Meyer, FaustGymnasium Staufen (Mhb)
Interactive training: multiplication of decimals (requires JavaScript). The user has to fill in boxes with proper digits to practice the multiplication algorithm. Problems may be posed either by the user or by the computer. A German version is available.
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 Multiplication Tips  Calculation Tips & Tricks, The Math Forum
Tips contributed by students for multiplying by 5, 9, and 11.
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 Multiply!  Dani Kenli
Enter your name and press the "Click to start" button, then key in the products indicated to compete in this selfdescribed "International Multiplication Championship," which ranks your speed and accuracy in a table of the world's multipliers. Refresh
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 Murderous Maths  Kjartan Poskitt et al.
Contents, descriptions of characters, updates, and "extra bits" for the books Murderous Maths; The Essential Arithmetricks; Desperate Measures; Do You Feel Lucky?; Vicious Circles and other Savage Shapes; The Phantom X; The Fiendish Angletron; The GCSE
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 The Music of the Primes  Marcus du Sautoy
An article on the Riemann Hypothesis, "the greatest unsolved problem of mathematics."
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 MX4002: Algorithms  Ian Craw and John Pulham; University of Aberdeen
Lecture notes, tutorial sheets, exams, and other material provided for a course on algorithms with the objective of exposing the student to a small number of typical methods from a range of different contexts, so as to reveal the type of thinking that
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 My GRE Tutor
Includes hundreds of math questions, ranging from elementary arithmetic to geometry. Answers to questions are fully explained, and the complete GRE practice tests contain math questions, too. Free; login required.
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 MyiMaths  MyiMaths Ltd
A teaching resource comprised of hundreds of interactive lessons, each with dynamically generated activities, games, tools, and questions. See samples and reviews before purchasing a subscription.
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 My Magic Square  Michael Dormann
Enter a number from 23 to 100, then press the calculate button to see a completed 4x4 magic square, of which any row, column, diagonal, the center square, and the four corners each sums to the number entered.
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 My Math Forum  Julien Santini
Discussion forums that concentrate on college and high school mathematics. Santini posts PDFs of two Weekly Problems, one intended for advanced high school students, the other for college students. See also his "250 Solved Problems," with downloadable
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 MyMathTutor.com  Charles Patrick McKeague
A webbased eLearning resource that supplements traditional textbook and classroom learning. Before signing up for this feebased service, demo one of their RealPlayer video tutorials, which show how to solve math problems. Each lesson includes a practice
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 MyTestBook.com
Standardsbased tests and worksheets for grades 15. Free registration required. Worksheet generator for teachers.
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 MyWeblets.com  Math Worksheets for Kids  MyWeblets.com
Free math worksheets for kidsboth premade and randomly generated, with optional answer key.
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 A Nameless Number  Len Smiley
Trianglefree polygon dissections are a variant of the dissection questions of Catalan, Schroeder, and others: In a convex (n+2)gon with n+2 labeled nodes, what is a(n), the number of ways of drawing nonintersecting diagonals so that no triangles are
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 Napoleon's Theorem  Cut the Knot!, Alexander Bogomolny
On the sides of a triangle construct equilateral triangles (outer or inner Napoleon triangles). Napoleon's theorem states that the centers of the three outer Napoleon triangles form another equilateral triangle. The statement also holds for the three
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 NASA KIDS  Science @ NASA
Puzzles, games, and science stories for students in grades 58, from the U.S. National Aeronautics and Space Administration. Students can earn certificates by joining the NASA KIDS Club and completing its learning activities. Mathematics teachers can
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 Navworld  Joseph Portney
A center for the art and science of navigation, providing navigational "cerebrations," famous historical accounts, interviews and biographies. See Earthshapes, different ideas of what the earth would look like if it were one of 12 different shapes (physical
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 Network Tutors
Provide online worksheets and learning plans for elementary and middle school students. Provide tutors in all areas up to college level courses. Various plans available.
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 New Mathwright Library  James White; Bluejay Lispware
An Internetbased library of interactive workbooks on topics commonly encountered in undergraduate mathematics, from college algebra and precalculus through multivariable calculus, differential equations, and mathematical modelling. Workbooks, together
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 NewPath Learning
Publishers of handson print and interactive digital learning resources for reinforcement and review. See, in particular, NewPath Learning products for math, browseable by grade and national or state standards. Shop for and purchase Curriculum Mastery®
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 Newton's Castle  Steve Feld
Learn about color, optical illusions, how cars appear to roll uphill on "magnetic mountains," why dogs chase cars, and more; then test your learning with the online quiz. Also, see quotations and a timeline of Newton's life. With a bibliography and webliography.
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 NewtonsWindow.com  Suzanne Sutton
For students, families, teachers, and homeschoolers as they learn and teach math. NewtownsWindow.com offers math challenge excursions online, summer learning activities, and educational gifts and ideas. With suggestions for reinforcing concepts at home,
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 New York Group Theory Cooperative at CCNY
Genetic algorithms, open problems and preprints in combinatorial and geometric group theory, meetings, links, and MAGNUS, a free (GPL) graphically oriented system, based on Tcl/Tk, for computational group theory designed to allow for exploration and experimentation
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 New York Regents Exam Prep Center  Oswego City School District
A site dedicated to assisting high school students in preparing for the "new" New York State Math A Regents Examination. Covers Algebra, Geometry, and Algebra II/Trig. The materials featured for each topic include: general review/formula sheet, Regents
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 New York State Regents Examinations/Tests  New York State Department of Education
Tests and scoring keys, listed according to the subject and date administered, provided in Portable Document Format (.pdf). All three levels of Sequential Mathematics, including language editions in Chinese, Haitian Creole, Korean, Russian, and Spanish.
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