 Impossible World  Vlad Alexeev
About impossible figures in art. These figures can be painted on paper but cannot be represented in space. There are many artworks by M.C. Escher, Jos de Mey, Sandro del Prete and many other artists. Also, you can view animations and read articles about
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 Improving Measurement and Geometry in Elementary Schools (IMAGES)  Research for Better Schools (RBS)
Information and resources designed to help teachers develop a deeper understanding of geometry and measurement concepts and to assist in designing meaningful instruction for elementary students. Topics addressed include: cognitive and developmental issues;
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 IMSA Math Journal  Michele Micetich; Illinois Mathematics and Science Academy
A journal published annually since 1993; each issue contains articles, problems, and activities spanning a wide variety of topics of interest to high school mathematics teachers and students. Articles are available in both online and downloadable versions.
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 invention at play  Lemelson Center, Smithsonian National Museum of American History
Rotate and translate the tangramlike pieces of Puzzle Blocks to form the silhouettes shown; arrange the gears, springs, funnels, and other objects of Tinker Ball to divert the falling ball into the target. The Invention at Play exhibition focuses on
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 iSchoolPolymath  Sarah Prendergast
Video libraries, syllabi, Pinterest inspiration pages, and other materials for math courses taught at iSchoolPolymath, a public high school in New York City. Prendergast's Algebra I course incorporates gamification, handson projects, problem solving,
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 James Poon Online Classroom  James Poon
Online instructional mathematics videos; a discussion forum; and articles on study skills.
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 John Mason's Projects  John Mason
Projects by the author of Thinking Mathematically and former director of the Centre for Mathematics Education: Structured Variation Grids and other animations and applets; studies in algebraic thinking; mathematical explorations; MEMEs (Meaning Enquiry
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 John Olive's Home Page  John Olive, Department of Mathematics Education, The University of Georgia
Course descriptions and requirements for Computers in Mathematics Education and Investigations into the Teaching of Mathematics Grades 712. Recent articles, available online, include Computer Tools for Interactive Mathematical Activity in the Elementary
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 K12 Geometry  Math Forum
Links to some of the best Internet resources for geometry: classroom materials, software, interactive materials, Internet projects, and public forums for discussion.
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 Ka's Geometriepage & MatheGalerie: Grundschulmathematik  Monika Schwarze
Eine Seite zur Grundschulmathematik mit SoftwareTipps. Links zu Mathematikunterrichtseinheiten für Grundschulkinder der Klassen 1 bis Klasse 4; Freiarbeitsmaterialien und kleinen Unterrichtsprojekten. A German Web site for teachers and lovers of geometry,
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 Key Curriculum Press
Publisher of innovative texts and software applications for teaching mathematics including the Geometer's Sketchpad (dynamic geometry), Fathom (dynamic statistics), TinkerPlots (dynamic data exploration and analysis), Michael Serra's textbook Discovering
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 KSEG  Ilya Baran
KSEG is a Linux program for dynamically exploring Euclidean geometry. Create a construction, such as a triangle with a circumcenter; drag its vertices, and its circumcenter moves accordingly in real time. Features include a fast core to support large
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 Álbumes Ilustrados Sobre Ciencia  Verónica Navarro
Álbumes ilustrados de geometría y arte abstracto como lo de Joan Miró, Paul Klee, y Wassily Kandinsky: La rebelión de las formas hace un itinerario por la geometría, la física, y el arte en un intento de reflexionar
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 M^3 (Making Math Meaningful)  Mary Bourassa
Blog by the Director of Ontario Association for Mathematics Education (OAME). Posts by this winner of the NCTM Future Leaders Award date back to April, 2013, and have included "Parabolic Art," "Day 7," "Completing the Square with Algebra Tiles," "MFM2P
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 Mangahigh.com Math Games  Blue Duck Education Ltd
A gamesbased math learning environment built around the UK's national curriculum. Mangahigh.com's online quiz game, Prodigi, adaptively coaches students aged 1016 with worked examples, full hints, and solutions. Other interactive games include "Save
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 Manipula Math with Java  International Education Software (IES)
Hundreds of interactive Java applets for middle school through early college years on subjects such as geometry, calculus, trigonometry, linear transformations, vectors, complex numbers, and conics. Applets and animations often include introductions to
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 The Map is Not the Territory  Malke Rosenfeld
Blog by a traditional percussive dancer (Appalachian style flatfooting and clogging and Canadian step dancing) who "teaches the math that directly relates to the process of making rhythm and patterns with the feet." Posts about the mathematics of percussive
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 Mathagogy  Peps Mccrea
"Two minute mathematics education" videos posted by teachers on how they teach particular concepts. Pedagogy clips outline approaches to teaching proportion, proof, prime numbers, probability, sine and cosine graphs, and algebraic literacy; or with Cuisenaire
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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 Art Activities  Zachary J. Brewer
Supplementary art activities for grades 24 intended to help teachers introduce, reinforce, or expand on the topics they teach. The online game Forty Frogs helps students conceptualize the process of finding fractions of sets. Read the introduction of
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 Math.com
Links to Internet math resources for students, teachers, and others, and to products from the Math.com store. Solutions include assessment, ondemand modular courses that target key math concepts, 24/7 live online tutoring, and expert answers to math
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 Math Cove  C. Mawata; Dept. of Mathematics, Univ. of Tennessee at Chattanooga.
Math Cove projects include: Java applets for exploring transformations (translations, reflections, and rotations) and learning about acute and obtuse angles and other concepts in triangle geometry; more than 20 lessons for studying graph theory (using
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 Mathematical Golf Sketches  Math Forum
This activity for studying reflections finds the direction to hit a golf ball to get it to bounce off several walls and into the cup (includes a construction of the solution). See also the introduction to this activity (from the Math Forum's 1996 Summer
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 Mathematical Machines  Museum of Natural Science and Scientific Instruments of the University of Modena
Models of machines based on scientific and technical literature dating back to classical Greece. Among other didactic goals, La collezione di Macchine Matematiche aims to foster reflection on the historical relationships between mathematics, society,
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 Mathematical Paintings and Sculptures  Vlad Alexeev
Blog featuring artworks and sculptures based on mathematical principles, especially fractals and Escherian images.
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 Mathematics Curriculum  North Carolina Department of Public Instruction (DPI)
The curriculum currently in use in the state of North Carolina. Includes resources on the web (lesson plans, assessment, etc.), and a list of DPI publications searchable by subject area.
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 Mathematics Education Resources at Acadia's School of Education  David A. Reid, Acadia University
Learn how to design mathbags, make a fraction quilt set, and teach with algebra tiles. Activities include Folding Fractions, exploring systems of linear equations with Geometer's Sketchpad, and Deductive Euclidean Geometry, as well as two Java applets,
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 Mathematics Graphics Gallery  Xah Lee
A collection of mathematical images. Links to files on Xah Lee's sites that contain attractive mathematics graphics: Nested Inversion of Circles; Conic Sections; Epicycloid and Hypocycloids; Rose Curves; wallpaper designs; Transformation of the Plane;
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 The Mathematics of Change  1993 Woodrow Wilson Leadership Program in Mathematics
Activities presented at a 1993 conference focused on change and reform, with notes on the type of technology represented and the level for which each is intended.
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 Mathematics Teacher: Geometry Bibliography  Hubert Ludwig
Hubert Ludwig, a math professor at Ball State University, has compiled an index of all the geometryrelated articles that appeared in the Mathematics Teacher through 1996. This page provides the index of the archive, with links to the documents in the
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 MathGifs
"Illuminating mathematics through animations." This blog, which dates back to September, 2013, has included illustrated posts such as "Reflective Property of the Ellipse," "Rotations Through Translations," "Fourier Pumpkins," "Sonic Booms," and "The Mandelbrot
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 MathMeeting  Chris Seber
Free instructional narrated screencast videos on algebra and calculus; live tutoring and homework help for hire. Seber, a civil engineering graduate whose "passion is to teach math," also offers clips on geometry, linear algebra, SAT practice problems,
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 Math Models  Bathsheba Grossman
Using rapid prototyping to create her pieces, Grossman describes them as "3D meditations": metal sculptures, etched crystals, and prints of Menger sponges, Lorenz attractors, 4dimensional solids projected into 3space, and triply periodic minimal surfaces
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 Math Mutation  Erik Seligman
These "show notes" accompany a short podcast of the same name that explores "fun, interesting, or just plain weird corners of mathematics that you probably didn't hear in school." Posts, which date back to December, 2011, have included "Flat People Give
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 Math Planet  ThinkQuest 1998
A site for high school students featuring algebra, geometry, and geometry concepts glossaries; crash courses on basic Algebra and Geometry; an advanced course on Algebra and Trigonometry; a customizable lesson plan based on individual level; an SAT and
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 Math Thinking  David Wees
"Sharing thinking about math from students": a collection of work by students that teachers have not taught them explicitly how to do. Wees elaborates that "the idea or technique a student uses does not itself have to be completely original, just new
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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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 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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 MiGen  London Knowledge Lab
This generalization software microworld presents the abstractions of algebra in a visual format. With MiGen's simple sequences of coloured tiles, young learners construct patterns (eGeneraliser), express their structure and relationships (eXpresser),
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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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 MMach 1.3: Khoros 2.1 Toolbox on Mathematical Morphology  Adriano Nagelschmidt Rodrigues, Junior Barrera, Roberto de Alencar Lotufo, Roberto Hirata Jr.
Mathematical morphology is a general theory that studies decompositions of operators between complete lattices in terms of some families of simple operators: dilations, erosions, antidilations and antierosions. This theory is largely used in computer
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 Modeling Permutation Group (SMILE)  Mary Margaret Nee, Von Stueben Science Center
A lesson designed to teach students to construct equilateral triangles on cardboard; develop the transformation concept with a one to one correspondence; generate the rotation and reflection table; and deduce from the model the abstract axioms of a group.
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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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 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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 NECTAR Foundation: New Era Classroom, Technology and Research
A nonprofit foundation specialising in the development and marketing of educational software in the kindergarten to grade 12 program with a focus on mathematics software programs. It also develops and markets print, video, and audio materials for students
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 Nils Ahbel  Deerfield Academy, Deerfield, MA
Access Ahbel's Blackboard courses as a guest to preview his teaching resources and download Excel files in algebra, functions, statistics, and trigonometry.
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 A Number of Things  Karyn Vogel
Blog where a K5 Math Coach in Burlington (VT) "shares ideas and resources related to mathematics and education." Posts, which date back to October, 2011, have included "Math and Image," "A new way of problemsolving," "Sugar and Ice book review," "Plus
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 Origami Snowflake Game  Rick Nordal
Origami designs to fold from a "snowflake" base — a square of 32 identical 45°45°90° triangles. Topics from Nordal's sixteen chapters include "Base fold geometric snowflakes," "Lightning folds," "How to fold 3 geometric snowflake shapes,"
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 Pages Mathématiques  Lycée de Vienne SaintRomainEnGal (académie Grenoble)
Une série de cours de mathématiques: Géométrie du triangle; Transformations; Géométrie des cercles; Barycentres; Coniques et courbes; Solides; Statistiques; Fractales; Géométrie non euclidienne;
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 Patternbee Multiplayer Spatial Reasoning  Jordan Pollack
In this version of tangrams, pairs of learners create the puzzles for each other to solve, which can be at different levels of difficulty. Requires free registration to play, as this is an educational psychology research project.
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