 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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 Mirrors (Geometry and the Imagination)  Conway, Doyle, Gilman, Thurston; The Geometry Center
How do you hold two mirrors so as to get an integral number of images of yourself? Discuss the handedness of the images. Set up two mirrors so as to make perfect kaleidoscopic patterns. How can you use them to make a snowflake?...
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 Miscellaneous (Manipula Math)  International Education Software (IES)
More than 30 miscellaneous Java applets, covering linear transformations of lattices and lines; the area of a parallelogram; inner products; complex numbers; fractals; vectors; life game; line and dot product; hyperbola; parabola; shadow trace; rectangular
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 Miscellaneous Sketches: Conics, Pythagorean Theorem...  Key Curriculum Press
Sketches: describing the relationships of parabola, hyperbola, and ellipse from an eccentricity point of view; four ways to demonstrate (manipulate) Pythagorean theorem  shear & rotation, shear & translation, similarity, and tessellation; studying
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 Miscellaneous Sketches: Linear Sketch, MidRhombus...  Key Curriculum Press
Sketches: a dynamic display of the equation of a line as you move it around; an illustration of the midpoint figure of a quadrilateral; a tessellation made in the pattern of a Navajo rug; a sketch that draws the regular polygon with given internal angle;
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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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 Mission: Possible (SMILE)  Mary Terhune, Rachel Carson School
A lesson for grades 58, designed to teach students to convert scaled directions in inches to actual measurements in feet; correctly measure distances on an outdoor path; and enlarge a section of a map 5:1. From the Practical and Applied Math section
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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 Pi Computer Math Competion  Otet Alexandru
A math competition for Romanian students, for one "Pi School" per city. Detailed instructions on the site.
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 Misunderstood Minds  PBS
The science behind learning difference, and strategies to aid success in school, are available on this companion Web site for the Misunderstood Minds PBS documentary. The site includes profiles of the students in the documentary, as well as sections on
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 MIT+K12  Massachusetts Institute of Technology
An open platform for K12 educators and Massachusetts Institute of Technology (MIT) to work together to make and crowdcurate videos about science, technology, and math. This collaboration of MIT and Khan Academy invites primary and secondary teachers
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 M.I.T. K12 Math Games Lesson Plans  Wendy Huang, MIT Teacher Ed Program Manager
A collection of math games lesson plans to make learning math fun and engaging for middle and high school students. Written by MIT teacher education students.
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 Mixture Problems  Math Forum, Ask Dr. Math Common Question
A selection of answers to questions about mixture problems, such as "How many liters of a 14 percent alcohol solution must be mixed with 20 liters of a 50 percent alcohol solution to get a 20 percent alcohol solution?"
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 M&M Software Online Catalog
Mailorder library of familyoriented, educational and game software, a resource for schoolteachers, home school associations and parents who want to use a computer as a creative teaching tool, or just for fun. Products for Apple IIs, the Macintosh, DOS
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 Mobilizing Minds: Teaching Math and Science in the Age of Sputnik  National Museum of American History, Smithsonian Institution
The 1957 launch of Sputnik, combined with a burgeoning school age population, catalyzed reform in mathematics and science teaching in the United States. This online exhibit presents objects from the time of Sputnik, including books and apparatus associated
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 Mobius  Paul Doherty
A Mobius strip is a band of paper that's deceptively simple in its appearance and exceptionally twisted in its properties. This activity is organized into an introduction, materials required, warming up, "what's going on?" and tools for further study,
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 Modeling MiddleSchool Mathematics (MMM)  Bolster Education
Video lessons (on tape and via the Web) that examine the content and structure of five mathematics curricula: Connected Math Project, Mathematics in Context. MathScape, MathThematics, and Pathways to Algebra and Geometry. Included on the website are:
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 Models of Polyhedra (The Geometry Junkyard)  David Eppstein, Theory Group, ICS, UC Irvine
One of the most common forms of geometric modelmaking involves construction of the five Platonic solids, and of various related symmetric threedimensional polyhedra. The most common construction methods involve folding and gluing together cutout paper
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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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 The Moebius Strip  Jan Garner
An exercise on making a Moebius strip (a loop of paper with a half twist in it). How to make it, what to do with it, where to find it on the Web.
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 Money as You Grow  United States Department of Treasury
Twenty ageappropriate financial activity prompts for parents to promote financial literacy in their children. Companion site to Money as You Learn, another initiative  for teachers  of the President's Advisory Council on Financial Capability.
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 Money as You Learn  United States Department of Treasury
Lessons, activities, and other teacher tools to integrate personal finance into the teaching of the Common Core State Standards (CCSS) in Mathematics. "Personal finance big ideas" include cost/benefit analysis, delayed gratification, inflation, opportunity
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 Money Cents  MoneyCents, Inc.
Cartoon characters introduce the basics of saving and spending money. Interactive calculators to investigate sales and car loans, history quizzes, and Shockwave games.
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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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 Money Instructor
Teach and learn money, personal finance, money management. Free limited trial version, or pay for the full version. Includes money worksheets, lessons, lesson plans, counting money, spending and saving, checking, budgeting, investing, and more money topics.
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 Money  Lesson Ideas: Math; Teachnet.Com
293 Ways to Make Change for $1; Place Value Made Fun (dice games, counting money); Order Out (applying multiplication, planning, and calculator skills
by using an order out bill).
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 Money Math  Education 4 Kids, Inc.
Three types of games at two levels of complexity: making change, spending money, and "Piggy Bank Breakin."
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 Money Math: Lessons for Life  Mary C. Suiter, Sarapage McCorkle
Money Math: Lessons for Life is a free, four lesson curriculum supplement in PDF format that uses real world personal financial scenarios to teach mathematical
concepts and basic finance to students in grades 79. The lessons emphasize the application
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 Money Matters (SMILE)  Barbette Flennoy, Joseph Stockton School
A lesson designed to introduce students to different countries' money and the United States monetary value of a penny, a nickel, a dime, and a quarter. From the Practical and Applied Math section of a collection of almost 200 single concept lessons by
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 Money Skills (Early Learning Series)  Marblesoft Software
Four activities for the Mac that teach counting money and making change in American and Canadian money.
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 MoneyWise: Parents & Educators  Charles Schwab & Co., Inc.
Resources for teaching kids and teens money basics: articles; handson activities; life lessons; families & money surveys; questions and answers from Schwab's "Ask Carrie" service on everyday financial challenges; workshops, curricula, and more.
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 Monica Neagoy: Mathematics and Mathematics Education Consulting Services
Monica Neagoy is a mathematics consultant, public speaker, tutor, and teacher. She offers keynote addresses, Math Magic shows, teacher professional development, creative/technical writing, and other activities at the intersection of arts, education, and
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 Monkey Pod Games  Monkey Pod Games
Monkey Pod Games specializes in puzzles that can be used in the math classroom in order to help students understand mathematical concepts more easily.
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 Monkeys Dividing Coconuts  Math Forum, Ask Dr. Math Common Question
A selection of answers to questions about monkeys dividing coconuts, such as "A monkey divides a pile of coconuts into three, tosses the extra one, and takes his share...."
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 The Monkey Shakespeare Simulator  AardAsNails Software
Simulating monkeys typing randomly on typewriters, this Java applet displays output that matches text from any of Shakespeare's plays in realtime. To raise the chances of "interesting results within our lifetimes," this simulation runs at an accelerated
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 Monthly Themes  NRICH Maths, Univ. of Cambridge
Past problems from the NRICH Online Maths Club, archived by month. 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
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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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 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 Complicated Than It Seems  Kate Nonesuch
In this review of the literature of approaches to adult numeracy instruction, Kate Nonesuch asks the question, "How can ABE math instructors apply research findings to their own teaching practice?" Through an extensive literature review and ongoing discussions
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 More Fibbery  Gregory K. Pincus
"Fibs./ Terse./ Defined./ As your tools,/ Twenty syllables;/ How you use them is up to you." The author explains this form of poetry and its two most important rules: the syllable count of 1/1/2/3/5/8  the first six digits from the Fibonacci sequence
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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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 More Papercutting Patterns (Geometry and the Imagination)  Conway, Doyle, Gilman, Thurston; The Geometry Center
Conical, cylindrical patterns, Moebius, and other symmetrical patterns to experiment with.
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 More than Just a Plane Game  Ivars Peterson (MathTrek)
When topologists started to explore the world of geometric forms in higher dimensions, they found that neither the intuition nor the vocabulary of ordinary geometry was sufficient to describe and classify the new forms they discovered. They introduced
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 Morphing Art (MatheMUSEments!)  Ivars Peterson (Math Muse for Kids)
When you're riding along on your bike or in a car, you sometimes see the word "ONLY" painted on the roadway just before an intersection. The white letters look normal from where you're sitting. But if you were standing beside the "ONLY" instead of riding
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 The Most Colorful Math of All (MegaMath)  Nancy Casey; Los Alamos National Laboratory
Coloring is a profound mathematical topic with multimilliondollar industrial applications. The problem presented here has been of interest to mathematicians for over a hundred years. With a few crayons or markers and some handdrawn maps, children can
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