 Merlin's Magic Squares  Cut the Knot!, Alexander Bogomolny
The toy game of Merlin is not quite trivial and the mathematics is simple enough to provide an entertaining exercise in a Linear Algebra class. The original game is played on a 3x3 array of buttons that toggle between two states. The goal of the game
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 Mersenne Primes: History, Theorems and Lists  Chris Caldwell; Dept. of Mathematics & Computer Science, Univ. of Tennessee at Martin
When 2n1 is prime it is said to be a Mersenne prime. Page contents: Early History; Perfect Numbers and a Few Theorems; Table of Known Mersenne Primes; The LucasLehmer Test and Recent History; Conjectures and Unsolved Problems; Remote pages on Mersennes:
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 Metamath  Norman Megill
A site for proofs and logic. Includes: Metamath Solitairea Java applet that lets you build simple proofs in logic and set theory (builtin: the axioms of logic and ZFC (ZermeloFraenkel with Choice) set theory) with source code and other web resources;
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 Michael Serra
From the author of Discovering Geometry: An Investigative Approach and Smart Moves: the Games and Puzzles series; videos such as DG Investigations and "How to Teach Math Anxiety"; articles and handouts on cooperative learning; speaking engagements and
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 Middle School Geometry (Manipula Math)  International Education Software (IES)
Over 50 applets illustrating topics from plane geometry: angles and parallel lines; congruent figures and triangles; quadrilaterals and conservation of area; similar figures; polygons; circles; and the Pythagorean Theorem.
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 Middle School Problem of the Week  Math Forum
A project designed to challenge middle school students with nonroutine problems and to encourage them to verbalize their solutions. From 1996 until 2002, submissions were read and assessed, and comments were returned to the students. The problems are
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 Middle School Problem of the Week  ThinkQuest 1996
A nolongeractive project from Matt Gehrett's Class, Grade 10, Ridgeview High School, Bakersfield, California, USA. A weekly problem at the middle school level, with archives of past problems and answers.
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 Mike's Archive of Riddles and Puzzles (MARP)  Michael Winckler
A puzzle of the week, and an archive of more than 120 puzzles and riddles, with solutions, published in Die FreizeitWoche, a weekly webzine for the AG of Prof. Bock at the IWR in Heidelberg.
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 Mike's Math Club  The Milken Family Foundation
A curriculum enrichment program, Mike's Math Club provides "handy hints" that promote mastery of such basics as doubledigit multiplication, and math games that show elementary school students how to use logic and deductive reasoning to create strategies
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 mikesmathpage  Mike Lawler
Blog by a former math professor "writing about math with my kids." Posts, many with videos of Lawler and his children at a whiteboard, date back to November, 2013: "Day in the life of a home school dad," "Family Math and paper folding," "Fun with James
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 The Mint  The Northwestern Mutual Life Insurance Company
Learn about starting your own business, saving and investing, government spending, making a budget, learning and earning (the financial rewards of finishing school), and your role in the economy. Lesson plans for parents and teachers include Financial
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 Mirror Curves  Slavik Jablan, Mathematical Institute, Belgrade
Making art by repeating a curve to make a more complicated design, by symmetry/reflection. This paper illustrates Tamil threshold designs, Lunda and Chokwe sand drawings, and the knots/curves of Leonardo da Vinci.
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 Mirror Puzzles  Erich's Puzzle Palace; Erich Friedman
Each square in the grids shown contains either a person lost in the hall of mirrors, or a diagonal mirror. The numbers at the sides of the square indicate how many people can be seen from that location when looking either horizontally or vertically. The
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 Missing Dollar  Math Forum, a Classic Problem from the Ask Dr. Math FAQ
Three men go to stay at a motel, and the man at the desk charges them $30.00 for a room. They split the cost ten dollars each... where is the missing $1.00?
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 Mission Challenge  University of Maryland Ball Aerospace & Technologies Corp.
"After a voyage of 173 days and 431 million kilometers (268 million miles), NASA's Deep Impact spacecraft will get upclose and personal with comet Tempel 1 on July 4, 2005. The first of its kind, hyperspeed impact between spaceborne iceberg and copperfortified
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 Miss Lindquist: The Tutor  Neil Heffernan
A free Web tutoring system for middle school and high school students concentrating on writing expressions for algebra word problems. Teachers can assign portions of this site for homework, students can get help as they do their homework, and progress
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 MistaMath  Roger Vanderlely
Tutorials, advice, worksheets, and narrated screencast videos for learning the basics, fractions, and algebra: adding integers, learning multiplication tables, factor trees, exponents, definition of exponents, adding exponents, subtracting exponents,
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 Mister Goodmath's 'Cool' Challenges of the Week  Mike Rooney; Welleby Elementary School, Sunrise, Florida
More than 30 challenge problems, with hints but no solutions. Join "Gator" and pack your bag for an incredible journey through real life challenges. The first problem listed on the menu is always the most current challenge being attacked by Welleby students
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 Mistry Maths  Manoj Mistry
Free and fee PowerPoint UK KS3 and KS4 lessons, planned with OFSTED grading criteria.
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 Modes of Thinking  Cut the Knot!, Alexander Bogomolny
Mathematics is verbal for it's a language, and it is abstract for in its heart one finds proofs and axiomatizations. It is symbolic, rational, logical, and, nowadays, it is very digital. These are all indications that mathematics is firmly entrenched
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 Modularity in Art  Slavik Jablan, Mathematical Institute, Belgrade
Jablan uses the word "modularity" to refer to the process of making art by repeating a simple block, tile, or motif to make a more complicated design, by symmetry/reflection and/or tessellation. This site includes a paper on such art and its math, linked
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 Modules de mathématiques  Gilles Desbiens; Centre collégial de formation à distance (Québec, Canada)
Révision des notions acquises au secondaire, avec la collaboration du Groupe Vidéotron ltée. Ensembles et fractions; exposants et factorisation; équations et inéquations; fonctions algébriques, équations
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 The Money Game: World School Investment Challenge  Von Kaay Capital Network Inc., Ontario, Canada
A contest for schools (with a separate contest for high school seniors) that allows you to manage an investment portfolio. Classes or schools whose portfolios make the most money win some real money for their school. Find out the details and read the
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 Montpelier Portfolio Program (Mathematics)  Montpelier Public Schools
A site that invites students to use creative strategies to solve story questions. Students choose a problem to solve and send in the solution, showing how they found it; assessments of their efforts are returned via email. Questions to help guide students
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 Monty Hall Dilemma  Interactive Mathematics Miscellany and Puzzles, Alexander Bogomolny
A full discussion (including simulation) of the famous "three doors" problem, also known as the Game Show problem.
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 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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 mooculus  Jim Fowler, et al.
Free YouTube lectures and textbook that introduce calculus. With the support of the mathematics department at The Ohio State University, this 15week course designed for selfpaced independent learning appeals to a wide audience  from those who have
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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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 MooMooMath  Bryon Blankenbecler
Hundreds of instructional whiteboard video primers, examples, and practice problems with step by step solutions. Formerly a public school teacher and tutor, Blankenbecler now teaches online, through a virtual school.
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 More Meaningful Math  Monika Schwarze
An international project to motivate students ages 12 to 16 with problems that show the importance of mathematics in real life and related to other subjects, and to enrich their teachers' methodology. Browse the file archive of freely downloadable documents
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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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 Mr. Orr is a Geek.com  Jon Orr
Blog by a Chatham, Ontario (Canada) secondary school math teacher. Posts, which date back to February, 2009, have included "Gr. 11 Quadratics Functions in the real world," "Grade 12 – Mind Map for Project," "Grade 9 Pentominoes," "Grade 11 – Exponential
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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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