 MathWorld Interactive  Carolynn S. Mortensen
Openended word problems and some answers from this nowdefunct project. MathWorld began as MathMagic FidoNet in 1991, and was dedicated to helping educators and parents motivate their students to solve openended word problems, communicate mathematically,
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 MathWorlds  SimCalc: Simulations for Calculus Learning
MathWorlds enables students to learn through exploration of animated worlds and dynamic graphs. The worlds present moving objects and characters in a variety of settings, such as elevators in a building or duckies on a pond. Manipulable graphs control
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 MathZapper  Russel Timmins
Libraries of smartboard video tutorials for the student of mathematics, organized into GCSE, IGCSE, A Level, and International Baccalaureate (IB).
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 Matific  Slate Science
"Episodes" of bitesized interactive activities and worksheets aligned to the enVisionMATH and Everday Math curricula, as well as to the Common Core State Standards (CCSS).
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 matthen  Matthew Henderson
"Things of interest in maths & science" created by a PhD candidate in Statistical Dialogue Systems who majored in mathematics as an undergraduate. Posts date back to March 2011, and routinely feature Henderson's original animated gifs: "Orbits around
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 Maximizing & Minimizing the Area of Rectangles Given a Fixed Perimeter (SMILE)  Tim Amrein, Franklin Fine Arts Center
A lesson for grades 58 designed to teach students to analyze and solve problems in which rectangles with identical perimeters are compared to maximize or minimize area; collect data and search for patterns and generalizable relations; represent problem
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 Maximum Volume & Area with the Geometer's Sketchpad  David Purdy, Wisconsin Heights High School, Mazomanie, WI
Common in calculus and advanced algebra texts, these wellknown optimization problems now appear in high school geometry texts as interesting explorations that integrate measurement, model building, polynomial functions and use of the graphing calculator.
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 Maxwell's Demon  Edmund Harriss
Harriss, a mathematician and artist of substitution tilings, tilings with a scaling symmetry like the Penrose Tiling, writes that "the major themes of this blog revolve around mathematics communication and mathematics art." His posts, which date back
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 MCAS Math 10 Resources  George C. Brackett
Over 90 past multiplechoice problems from the Massachusetts Comprehensive Assessment System (MCAS) 10thgrade mathematics test, with detailed solutions available by clicking a button at the bottom of the problem. Problems include those from strands Number
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 Measurements: Inches (SMILE)  Joyce McCoy, Spencer Math and Science Academy
A lesson for the primary grades designed to teach students to solve problems involving measurement using information taken from various items measured. Students measure to the nearest inch, identify the length and width of rectangles, write simple addition
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 Measuring an Angle  NASA Lewis Learning Technologies Project
What is the measure of the angle shown? A detailed answer is provided. From NASA's 9th Grade Math Proficiency Test.
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 Media4Math
Free algebra and geometry videos, PowerPoint presentations, Promethean Flipcharts, critical thinking activities, workedout examples, and other media resources. An initiative of Emmy awardwinner Edward de Leon, executive producer of "Greatest Inventions
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 Median  Don Steward
Blog by a maths teacher influenced by Hans Freudenthal. A fan of unicase, Steward teaches 1016 yearolds in Shropshire (UK). His posts, which date back to November, 2007, have included "loooooong multiplication  grid method," "two reversal problems,"
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 MenuMath  JeanPierre Gosselin, Collège NotreDame de la Paix
Un outil d'aide à l'enseignement et à l'étude des maths du secondaire. Ce logiciel gratuit (Windows 95/98) regroupe 78 programmes d'arithmétique, d'algèbre, de géométrie, de trigonométrie, d'analytique,
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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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 Michigan Math Scholars
A summer program for high school students at the University of Michigan. Program information, mathematics news, a student paper ("On the Problem of Dividing a Clock Face Into Equal Thirds"), several online courses (The Nature of Infinity; Chaos; Graph
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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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 MiddleSchool Math Through Applications Project (MMAP)  Institute for Research on Learning (IRL)
Developers of curriculum materials and software designed to make math relevant, accessible and successful for middleschool students. While working on realworld multidisciplinary design problems, students grapple with mathematics from basic skills to
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 Middle School 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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 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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 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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 MiLearn High School Course Complements
Curriculumbased high school level math resources in an interactive, "concept, example, application" web design. Courses contain over 500 web pages of stepby step examples and solutions; free demos are available on the site. MiLearn also provides consulting
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 The Millennium Sphere  The Cooper Union
Jean Le Mee, Manuel A. Baez, and a team of their Cooper Union students submitted the Millennium Sphere for an international timecapsule competition sponsored by the New York Times Magazine. Watch a Shockwave animation of Ad Quadratum generation that
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 Milliken Publishing
K12 instructional books and software for home or school use, in several subject areas including math. "Math Sequences" software demo for Windows is available on the web. Software may be purchased on the web, and book dealers are listed by town within
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 MiMa  Museum for Minerals and Mathematics Oberwolfach
This German museum's exhibits about mathematics, which focus on symmetry and crystallography, have included IMAGINARY; SURFER, a realtime ray tracer of algebraic surfaces; Cinderella & Curved Spaces; jReality; Morenaments; Doppelpendel; Penrose Puzzle;
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 Mirror Bounces  Ivars Peterson (MathLand)
In a game of mathematical billiards, one ball moves across the table at a constant speed forever. There's no friction to slow the ball down. It simply travels in a straight line until it hits a cushion and rebounds according to the rule that the angle
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 Mirror, Mirror (MatheMUSEments!)  Ivars Peterson (Math Muse for Kids)
If you stand between two mirrors that are parallel to each other, one in front of you and one behind, you see countless images of yourself. Light rays bounce back and forth between the mirrors to create that endlessly repeated pattern.
What happens when
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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: projection, modelling, rendering  Paul Bourke
Projection and displays, data visualization, photography and image manipulation, signal processing, and more.
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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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 misscalcul8
Blog by a high school teacher of algebra and geometry who "expects to be the best teacher that has ever lived, to change the world, and to live wealthy." Posts, which date back to February, 2009, have included "This, My Friend, Is Learning," "7 Country
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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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 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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 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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 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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 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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 MowMowMow'S Cabri Room
Cabri files for highschoollevel geometry. In English and Japanese.
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 Mozaik Kiadó  András Ringler
Computer animations for teaching mathematics include geometrical solutions of quadratic equations. Also available in Hungarian.
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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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 mrbartonmaths.com  Craig Barton
A free website for teachers, pupils and parents aimed to get everyone enjoying their maths a bit more. For teachers there are bucket loads of original resources, software tutorials and reviews; for students there are pupilfriendly notes, advice about
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 Mr. Brandenburg's List of Recommended Books on Math and Science  Guy Brandenburg
A list of over 140 math and sciencerelated books, mostly recent, for geometry students to choose from, read, and do a report on. This new list is organized by topic: astronomy; bad science; biography: mathematicians + scientists; biology/life science/evolution;
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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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 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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 MSTE Java  University of Illinois at UrbanaChampaign (UIUC)
Javabased activities submitted to MSTE, the Office for Mathematics, Science & Technology Education at UIUC. Topics include: best fit; box perimeter; Buffon's needle; CAD viewer; cereal box problem; chisquared test analysis of random marbles; cliff
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