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  1. Puzzles - Martin Watson
    Blogs, comments, musings, design sketches, and photographs of mechanical puzzles by an avid collector and craftsman. Puzzle news, the author's own burrs (Watson's wormhole, digigrams, Dutch cubist), in-depth explorations of manipulative puzzles (Puzzles ...more>>

  2. Puzzles/One-player Games - Jürg Nievergelt
    Rubik's Cube and its variants. The 3*3*3* cube; Rubik's Revenge (4*4*4 cube); Pyramix (tetrahedron); Rubik's Clock; Rubik's Magic. Also Cryptequations, polyominoes, and links to a list of similar puzzles. ...more>>

  3. The Puzzle TOAD - Tom Bohman, Oleg Pikhurko, Alan Frieze, and Danny Sleator, School of Computer Science, Carnegie Mellon University
    Send the authors your solutions to their challenging graph theory, number theory, geometry, discrete mathematics, logic, and other puzzles. Re-visit periodically to see the latest question, and download PDFs of solutions of past problems. ...more>>

  4. Puzzling Lines - Ivars Peterson (MathTrek)
    Sol LeWitt has often featured geometric and combinatorial themes in his sculptures, paintings, and drawings. In 1973 he composed "Straight Lines in Four Directions and All Their Possible Combinations," a grid of 15 squares, each inscribed with one or ...more>>

  5. The Puzzling World of Barry R. Clarke - Barry R. Clarke
    Brain teasers from Clarke's column in The Daily Telegraph (UK) and from his various puzzle books: liar problems, logic teasers, number conundrums, matchstick puzzles, lateral mind-benders, and more. With links to other puzzles sites and an article on ...more>>

  6. PyGeo - Arthur Siegel
    A dynamic geometry toolset written in Python, with dependencies on Python's Numeric and VPython extensions. It defines a set of geometric primitives in 3d space and allows for the construction of geometric models that can be manipulated interactively, ...more>>

  7. Pythia Equation Solver - Pablo Perna
    The site contains equations for which the user can solve automatically any unknown given the known parameters. Geometry equations include areas of triangles and circles, and surface area and volume for various 3D shapes. Equations also include electronics ...more>>

  8. Quadrangle - Nikolay Khizhnjak
    In Russian: Common properties of quadrangles, a cube and a circle are considered. ...more>>

  9. Quandaries and Queries (Math Central) - Dept. of Mathematics and Statistics, University of Regina, Saskatchewan, Canada
    A math Question and Answer area for K-12 students and teachers, with searchable archives of past questions and answers. ...more>>

  10. Quelques feuilles de Maple - Maple expliqué en français - Canonne
    An introduction to Maple in French. Algèbre Linéaire; Equations Différentielles; Equations et Inéquations; Fonctions; Géométrie; Graphiques; Polynômes et Fractions rationnelles; Programmation; Statistiques. ...more>>

  11. Quia! - The Learning Group
    Create your own Java-enabled quizzes, home pages, and learning games to play over the Internet: enter your material into a form, select a few options, and press a button. Games have been created and are available for browsing in mathematics, as well as: ...more>>

  12. Quizma --> Matemática Cálculo Robótica - Harold Suárez Guzmán
    In Spanish: Clases y Orientación en Matemáticas Cálculo y Robótica. Fórmulas - Demostraciones - Ejercicios - Ejemplos - Cálculo Interactivo. Algebra, Logaritmos, Trigonometría, Geometría, Estadística, Ecuaciones, Problemas de Planteo, Funciones, Geometría ...more>>

  13. the radical rational ... - Pam Wilson
    Blog by a National Board Certified Teacher (NBCT) of Algebra II and Geometry "in search of innovative ideas with a well-balanced approach for the math classroom." Posts, which date back to July, 2011, have included "The Purpose of Life and The Quadratic ...more>>

  14. Rafael Pacheco - Rafael Pacheco
    In Portuguese: lessons and materials centered on high school geometry. ...more>>

  15. Rainforest Maths - Jenny Eather
    Flash-based interactive mathematics activities with an Australian rainforest theme, for grades K through 6. Topics include: Number & Number Systems; Operations & Calculations; Strategies & Processes; Patterns & Algebra; Measurement; Space & Geometry; ...more>>

  16. The Rappin' Mathematician - Alex Kajitani
    The Rappin' Mathematician provides teachers and students with rap songs about math. Two CDs available separately or together; samples and testimonials available free on the site. ...more>>

  17. Reading a Protractor or a Ruler - Math Forum, Ask Dr. Math Common Question
    A selection of answers to questions about reading a protractor or a ruler, such as "What do the little lines on a ruler stand for?" ...more>>

  18. Real World - Lesson Ideas: Math; Teachnet.Com
    Activities: Buy Groceries; Plan Christmas Vacation; Credit Cards for Kids; Who's Average?; Carpet Your Classroom; Division from a Printer's Viewpoint. ...more>>

  19. Real World Math - Thomas J. Petra
    Lessons that use Google Earth to teach math include Oil Spill Estimates and Scientific Notations; Iditarod Challenge and Typhoon Project; Four Color Map and Mazes & Labyrinths; Crop Circles and Fractal Measurement; Lunar Sports and Rockets. Each lesson ...more>>

  20. Real World Math Via the Internet - Wendi Fein, M.A., Heritage Online
    K-12 math using real world problems and data that will support interdisciplinary teaching of science, social studies, history and business. Teachers in this course take advantage of the Internet for class discussions and to access material, and prepare ...more>>

  21. Recommended Mathematics Literature - International Mathematics Olympiad (IMO)
    A page of readings recommended by the International Mathematics Olympiad in association with Amazon.com Books. Major sections include: Problem Solving; Collections of Mathematical (Competition) Problems; Anthologies and Surveys; Number Theory; Analysis; ...more>>

  22. A Recursive Process - Dan Anderson
    Anderson's blog, which dates back to June of 2010, has included posts such as "Robocode & Math," "Standards Based Grading," "Cake:Frosting (A look into a proper ratio of real math:cool tech)," "Paper Towels WCYDWT (What Can You Do With This?)," "Two ...more>>

  23. Re-Inventing Fourth-Grade Mathematics - Jack J. Lopez; Kodak
    A series of four related activities through which students acquired a firm, active knowledge of some of the basic terminology of Euclidean geometry, learning the vocabulary for describing various geometric shapes and transformations. Students photographed ...more>>

  24. Religious Beliefs Made Visual: Geometry and Islam - Jane Norman, Consultant, Metropolitan Museum of Art
    Although the shapes and structures are based on the geometry of Euclid and other Greek mathematicians, Islamic artists used them to create visual statements about religious ideas. A discussion of the use of geometric motifs in Islamic art, with instructions ...more>>

  25. Renato Montemurro
    Libri dall'inventore delle tabelline times table: L'insegnamento della matematica nella scuola elementare (La Scuola); La matematica dalla scuola dell'infanzia alla scuola elementare (La Nuova Italia); una guida didattica per l'insegnante della scuola ...more>>

  26. Replacing Iowa and New Hampshire (Math Chat) - Frank Morgan, MAA Online
    Answer to the challenge: Propose a new system for selecting Presidential candidates. Winning answer by Joe Shipman: a year before the primaries start choose five congressional districts at random to have a primary the last week in January and five more ...more>>

  27. Research Papers - The Geometry Center
    Scientific papers written at the Geometry Center that use the unique aspects of hypertext to present information in a non-linear fashion. Many include movies or interactive pictures. A Tight Polyhedral Immersion of the Real Projective Plane with one Handle ...more>>

  28. Resource Bibliography: Children's Trade Books in Math - Beth G. Newhouse, Department of Mathematics & Statictics, Arizona State University
    A selected bibliography of books for kids that teach and reinforce math concepts, organized by topic: counting and number, number operations, large numbers, money, geometry, algebra, miscellaneous topics. Originally compiled by Dorothy Giroux and Denise ...more>>

  29. Resource Room (Math Central) - University of Regina, Regina, Saskatchewan, Canada
    French version: Centre de ressources. A service of Math Central that allows mathematics educators to share resources having to do with math teaching. Submissions are stored in a database that can be browsed by educational level and curriculum strand, ...more>>

  30. The Return of Odysseus and the Elements of Euclid - Andrew Wiesner; Classics Dept., Colorado College
    The author's 1994 honors thesis, which attempts to shed new light on the origins of Greek mathematics. ...more>>

  31. Reuleaux Triangle - Paul Kunkel
    An investigation into the Reuleaux triangle and its properties. ...more>>

  32. The Review Zone - Tina Velgos
    In-depth software reviews for parents and teachers. CD-ROM Reviews in all major educational topic categories including Math and Science; also an alphabetical CD-ROM index of all titles reviewed, each title with the recommended age or grade level. ...more>>

  33. Revision Universe - Arnav Rawat
    Downloadable worksheets with questions on cumulative frequency; line graphs; mean, mode, median and range; pie charts; curved graphs; expanding brackets; graphical solution of equations; ratio; trial and improvement; area and perimeter; density, mass ...more>>

  34. Rich Maths Tasks to Engage - East Midlands Maths Network
    These teacher-made rich maths tasks in number, algebra, shape, and data handling emerged from a collaborative project run by Jon Stratford, Lead Practitioner for the Specialist Schools and Academies Trust (SSAT): arrangements, clock face, chocolate dilemma, ...more>>

  35. Riding on Square Wheels - Ivars Peterson (MathTrek)
    A square wheel may be the ultimate flat tire. There's no way it can roll over a flat, smooth road without a sequence of jarring bumps. However, a square wheel can roll smoothly, keeping the axle moving in a straight line and at a constant velocity, if ...more>>

  36. Right Brained Math - Brandon Price
    "Searching for divergence and creativity in all that math-y stuff." Price teaches algebra, geometry, statistics, and robotics at Austin's Khabele School, an International Baccalaureate (IB) World School. His blog, which dates back to March, 2013, has ...more>>

  37. Riverdeep | Mathematics - Riverdeep Interactive Learning Limited
    Online resources for students, educators, and parents, that build on Riverdeep Interactive Learning's courseware and interactive simulations. Read about or demo Destination Math, a curriculum on CD-ROM in Basic Mathematics, Pre-Algebra, and Algebra I ...more>>

  38. Robert J. Lang Origami - Robert J. Lang
    Lang has catalogued and diagrammed over 400 models, combining aspects of the Western school of mathematical origami design with the Eastern emphasis upon line and form. Read about origami mathematics, which mathematically describe the underlying laws ...more>>

  39. Robert Kaplinsky - Glenrock Consulting - Robert Kaplinsky
    Lessons consist of "The Challenge(s)," "Question(s) To Ask," "Consider This," and alignments to Common Core State Standards (CCSS): "How Can We Water All Of The Grass?" and "How Much Money Should Dr. Evil Demand?" and "How Did They Make Ms. Pac-Man?" ...more>>

  40. Rocket High (SMILE) - Elizabeth Kelly, Pilsen Community Academy
    A lesson for grades 7-8 designed to reinforce students' measurement skills by having them manipulate a launcher to create specific angles, introducing them to the concept of tangents. From the Recreational and Creative Math section of a collection of ...more>>

  41. Rolling and Learning® with tri-square dice - Creative Enterprises, Inc.
    A book describing math games to be played with 14-sided dice, suitable for grades K-6 or 8. Order form available on the web. ...more>>

  42. Room 8 Geometry Book - Ms. Woods' First Grade
    Shape drawings by first-graders: Prelude; Shapes - Triangles, Circles, Ovals, Squares, Rectangles, Diamonds, Pentagons, Hexagons, Octagons, Other Shapes; Forms - Cubes, Rectangular Prisms, Pyramids, Spheres, Cylinders, Cones; Concepts - Corners, Angles, ...more>>

  43. The Roots of the Equation - James Cleveland
    Blog by a high school algebra teacher in New York City "trying to figure out how it all fits together ... [and] creating interdisciplinary problems, projects, and thinking." A Math for America (MfA) fellow, Cleveland has blogged since June, 2011, with ...more>>

  44. Rosebush Math Line Puzzles - Math Forum
    Three puzzles: 1) plant 7 rosebushes so that they form 6 straight lines with 3 rosebushes in each line. 2) plant 10 rosebushes in 5 straight lines with 4 bushes in each line. 3) plant 19 rosebushes in 9 straight lines with 5 bushes in each line. Questions, ...more>>

  45. Rouse Ball's Fallacy - Interactive Mathematics Miscellany and Puzzles, Alexander Bogomolny
    A famous fallacy by Rouse Ball now implemented in Java. A proof that an obtuse angle is right. How can that be? ...more>>

  46. R. S. Schaeffer - Randy S. Schaeffer, Math & Computer Science, Kutztown University of Pennsylvania
    Schaeffer teaches a course called "Methods of Teaching Secondary Mathematics." Download the lessons created by his students that call on Geometer's Sketchpad, graphing calculators, and Microsoft Excel. Lesson topics address parallel lines, box and whisker ...more>>

  47. Rungs and Vineyards - Paul Kunkel
    Investigations of two interesting visual effects seen from a moving automobile. It includes two interactive perspective drawings, and a discussion of the cylindrical and planar projections used to create them. ...more>>

  48. Sacramento Area Math Help and Tutoring - Just Math Learning Centers
    Just Math provides math help, tutoring and SAT prep for Sacramento area children through college students. Skills training in elementary math, algebra, geometry, and calculus. ...more>>

  49. Salinon: From Archimedes' Book of Lemmas - Interactive Mathematics Miscellany and Puzzles, Alexander Bogomolny
    A description of Archimedes' application of propositions from the second book of Euclid's Elements to mathematical proofs. An interactive Java exploration is provided. ...more>>

  50. Saltire Software
    Mathematical technology for industry and education. Saltire Software's core technologies are constraint-based interactive geometry systems, symbolic algebra, and optimization, with products for mechanical engineering, mathematics education and layout ...more>>

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