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  1. Desafios Matemáticos - Paulo Ferro
    Cinco desafios novos cada mês. Ferro, um professor de matemática licenciado pela Universidade de Coimbra, tambem oferece demonstracões de geometria dinâmica, jogos matemáticos, biografias de matemáticos, exames ...more>>

  2. Descriptive Geometry - Petr Plavjaník
    Software for creating and printing drawings, including conic sections, color fillings in Monge's projection, and axonometry. In English and Czech. ...more>>

  3. Developing Geometry Concepts Using Computer Programming Environments (i-Math Investigations) - Illuminations; National Council of Teachers of Mathematics (NCTM)
    An online, interactive, multimedia math investigation. Computer programming environments can be used to help children understand geometric concepts. The interactive tool in this i-Math investigation illustrates how LOGO can be used to foster creative ...more>>

  4. The Diamond Theorem - Steven H. Cullinane
    Finite projective geometry explains the surprising symmetry properties of some simple graphic designs -- found, for instance, in quilts. Links are provided for applications to sporadic simple groups (via the "Miracle Octad Generator" of R. T. Curtis), ...more>>

  5. Digital Mathematical Performance - Gadanidis, George; Borba, Marcelo; Hughes, Janette; et al.
    Watch video, live-acted dramatic storyboards, and animations of how people "perform" mathematics: Flatland, "Help Me, Fermi," Should Parallel Lines Never Meet," "The Pleasure of Making 10" (linear equations), "The Waiter" (the missing dollar problem), ...more>>

  6. Digital Math - Santa Barbara County Education Office
    A site to assist Algebra I, Grade 7, and Grade 6 students, their parents, and educators with the California State Mathematics Content Standards. Log in for Quicktime that provides step-by-step instruction to solve problems aligned with the mathematics ...more>>

  7. Discovering Geometry Newsletter - Key Curriculum Press
    A free biannual publication providing information and teaching techniques for The Geometer's Sketchpad software package, the Discovering Geometry Newsletter is a resource for those interested in geometry and technology education. Download PDFs of past ...more>>

  8. Discovering the Art of Mathematic - Fleron, Julian, et al.
    Resources to help mathematics faculty teach the subject to liberal arts and humanities undergraduates by actively involving them in authentic mathematical experiences that "provide meaningful cognitive and metacognitive gains, and nurture healthy and ...more>>

  9. Disfruta Las Matemáticas - Rod Pierce, mathsisfun.com
    Spanish language version of Maths is Fun. ...more>>

  10. Dividing The Plane - Jim Loy
    A line divides the plane into two pieces (regions). Draw another line. The plane is now divided into three or four regions. It is three regions if the lines are parallel, four if they intersect. A third line divides the plane into seven regions. Find ...more>>

  11. Division by Zero - Dave Richeson
    A blog about "math, puzzles, teaching, and academic technology." Posts, which date back to September of 2008 and sometimes introduce original applets, have included "Volumes of n-dimensional balls," "Albrecht Dürer's ruler and compass constructions," ...more>>

  12. donalduncan's Channel
    Narrated paper and pencil instructional videos -- some, specific to British Columbia's Foundations of Math and Precalculus exams -- on number, line segments and lines, rational expressions, factoring, quadratic functions, functions, exponents, polynomials, ...more>>

  13. Downloadable Articles, Papers & Materials - Michael de Villiers; Mathematics Education, Univ. of Durban-Westville, South Africa
    Articles by Villiers related to geometry and geometry education some in PDF format, including: An Extended Classification of Quadrilaterals; A Mathematical Treasure Hunt; Place Kicking Locus in Rugby; Sketchpad Solutions and Results; A Dual, and Generalizations, ...more>>

  14. Downloads - Mac - Mathematics - CNET Download.com
    Search this site to find a particular piece of software for the Mac, or browse their mathematics listings. ...more>>

  15. Downloads - PC - Mathematics - CNET Download.com
    Search this site to find a particular piece of software for the PC, or browse their mathematics listings. ...more>>

  16. DPGraph (Dynamic Photorealistic Graphing) - David Parker
    Software that allows you to: display multiple simultaneous dynamic photorealistic 3D implicit equalities and inequalities, and intersections of their volumes; spin, slice, and view time-dependent (moving) photorealistic surfaces in real time; and construct ...more>>

  17. Dr. Alfred Posamentier - Education Update, Inc.
    Blog by the Dean of Education at Mercy College (New York). Posamentier's Posts, which date back to August, 2010, have included "A Power Loop," "The Unusual Number Nine," "The Irrepressible Number 1," "Enriching Mathematics Instruction, Rather than Teaching ...more>>

  18. Drawing a Crop Circle - IES Ramon Cabanillas (Cambados, Pontevedra, Spain)
    To draw a crop circle, the high school students at IES Ramon Cabanillas (Cambados, Pontevedra, Spain) calculated ellipses and discovered the pentagram's relation to the golden mean. This website details their designs, practice, calculations, and final ...more>>

  19. Drawing on Math - Tina Cardone
    Blog by a public high school math teacher in Massachusetts who has participated in Boston University's PROMYS and the Institute of Advanced Studies' PCMI. Posts, which date back to August, 2011, have included "End of Year Reflections: Geometry Favorite ...more>>

  20. Dr. Genius - Hilaire Fernandes
    Dr. Genius: "Geometry Exploration and Numeric Intuitive User System." The successor of the Dr. Geo Project, this GNU interactive geometry software allows the construction and manipulation of geometric figures. Read documentation, subscribe to the mailing ...more>>

  21. Dr. Math Books - the Math Forum @ Drexel
    Featuring Internet references, glossaries, indexes, illustrations, and questions written by actual kids, each can be purchased from Amazon.com via links on this page. The page details the contents of each book: Dr. Math Gets You Ready for Algebra, Dr. ...more>>

  22. Duke University Math Union - Jadrian Miles
    The Duke University Math Union (DUMU) writes and hosts the annual Duke Math Meet. Download PDFs of problems and solutions from meets dating back to 1998. ...more>>

  23. Dynamic Mathematics Visualization for Young Learners
    Sketchpad in Grades 3-8 - a working conference, held at the University of Illinois at Chicago in February, 2003. Researchers, curriculum developers, and educators began developing a curriculum and software structure around The Geometer's Sketchpad technology ...more>>

  24. EasyCalculation.com
    Free online mathematics converter, calculators, and other tools for numbers, unit conversions, hexa conversions, decimal conversions, binary conversions, area, trigonometry, analytical geometry, algebra (e.g., group work, Bernoulli inequality, Venn diagrams ...more>>

  25. EdPlace Maths - EdPlace
    EdPlace Maths is a is a registered Curriculum Online subscription website that offers over 2000 interactive and printable maths worksheets for KS1 through KS4. Free samples available; paid subscriptions allow users to generate new problems for each worksheet ...more>>

  26. Educação Matemática e Novas Tecnologias - Gravina, Barreto; Universidade Federal do Rio Grande do Sul (UFRGS)
    Discusses new technologies as resources for the learning of Mathematics: software descriptions, lesson plans, articles. In Portuguese. ...more>>

  27. Education: Mathematics - The Mining Company
    Web resource lists of sites: see sciences - physical/computer and, beneath, mathematics by Kristin Matherly, with links to sites "in the spotlight" and topics: Algebra; Applied Math; Books; Business Math; Careers; Calculus; Communities; Competitions; ...more>>

  28. education.ti.com - Texas Instruments, Inc.
    Texas Instruments calculator resources and educational solutions: product information; free program downloads; classroom activities, including both a test prep section and a free, collaborative forum for sharing favorite activities that use TI technology, ...more>>

  29. Eduss - Eduss Broadcast & Media
    A commercial tutoring program in Math, English, and Phonics for grades 1-7. It features randomly-generated exercise sets and questions; subject testing; evaluation and reporting to student, parent, or teacher; and feedback on performance and achievement. ...more>>

  30. EduWare - EduWare, Inc.
    Eduware Software lets teachers create exams for any subject or from test banks of Regents questions for Science, Social Studies, Foreign Languages, and Math, using the Wizard Test Maker program. Math subjects include logic, algebra, geometry, the coordinate ...more>>

  31. EduWizardS
    Math tutoring and homework help service. Review the educational background, experience, fees, and ratings of tutors, then book a session with voice chat, whiteboard, and text-chat. Tutors adjust lesson pace "to a student's ability and guide them where ...more>>

  32. Edwards - Clayton Edwards
    Problems, lessons, units, and "starters" by a middle grades math teacher who believes in differentiation and "using a mixture of traditional and reform methods to solidify understanding and engage mathematical minds": integer operations, order of operations, ...more>>

  33. Eggbrain Productions - John P. Perna
    A Flash website where young people can test themselves on a variety of subjects, especially mathematics. Interactive quizzes on basic operations, basic algebra, fractions, simple geometry, etc. ...more>>

  34. Eighth Grade (AAA Math) - John Banfill
    Interactive math exercises, lessons, and games covering basic arithmetic concepts and methods, for eighth grade. ...more>>

  35. Ejercicios Resueltos de Matemáticas - Sergio De Los Santos
    Ejercicios resueltos para bajar (en forma Excel): Fórmulas, Aritmética; Álgebra; Trigonometría; Geometría analítica; Cálculo, Estadística, y Física. ...more>>

  36. Ejercicios y Problemas de Matemática - Pablo Mateus
    Ejercicios y problemas de números (natural, entero, racional, real), estadística, ecuaciones, funciones, análisis combinatorio, probabilidad, trigonometria, geometria, y más. También, um glosario y consejo sobre pruebas ...more>>

  37. Elementary Math Enrichment - Beth Schaubroeck
    Free mathematics enrichment materials for accelerated 4th and 5th graders. The 70 lessons, grouped into 12 different units, include solutions and teacher guides: Ancient Mathematics (Mayan math, in base 20; and Egyptian math, which lacks zero), Baseball ...more>>

  38. Elementary 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. ...more>>

  39. Elementary Problem of the Week - Math Forum
    A project designed to challenge elementary students with non-routine problems and to encourage them to verbalize their solutions. From 1995 to 2002, solutions submitted from students for the Elementary Problem of the Week were answered by Visiting Math ...more>>

  40. Elementary Resources: Math - Iram Khan and James Horner, CanTeach
    CanTeach was created to assist teachers in finding and using resources online. The authors have emphasized lesson plans, resources, and links which have a Canadian focus. The elementary math resources are organized into these categories: numbers, patterns ...more>>

  41. Elevated Math - Elevated Lab Press
    Instructional math videos, aligned to the Common Core State Standards (CCSS), enlivened with multiple voices as well as graphic and cartoon animation. This iPad app, which includes a whiteboard for working out math problems, comes with two lessons and ...more>>

  42. eMathHelp
    View worked solutions to problems, or submit your own to WyzAnt.com tutors. See also eMathHelp's notes on pre-algebra, algebra, calculus, differential equations, and more. ...more>>

  43. Emaths.Info - Vinod Sebastian
    Math tools, formulas, tutorials, videos, tables, and "curios," such as the unusual properties of 153, 1729, and 2519. See in particular Emaths' interactive games, which include the N queens problem, Towers of Hanoi, and partition magic, which finds a ...more>>

  44. The EMPower Project - TERC
    Extending Mathematical Power: A Math Curriculum for Adults, extends school mathematics reform to currently under-served populations so that they more effectively engage mathematical demands at work, at home as parents and caregivers, in the community, ...more>>

  45. Entersoft
    Instructional videos and slides for sale: Central Board of Secondary Education (CBSE) 10th maths, Vedic mathematics, and more. ...more>>

  46. Equation Search - Octahedron, LLC
    Browse common equations in algebra, geometry, trigonometry, calculus, probability, and finance; or perform keyword searches by equation name, variable name, constant name, and category. ...more>>

  47. EquPlus - Maria Chernenko
    An index of math and science equations, rendered in TeX, MathML, png image files, and MathType. Browse categories such as algebra, calculus, geometry, signal processing, trigonometry, and statistics. See also EquPlus's unit conversions, constants, and ...more>>

  48. Eratosthenes Finds Diameter of Earth! - Mary Kay Hemenway, University of Texas at Austin
    Students learn to estimate the diameter and circumference of the Earth by repeating Eratosthenes' experiment, exchange measured data and results, and use the Internet to research the mathematical and scientific contributions of Eratosthenes. Hemenway ...more>>

  49. Eric Buffington
    YouTube lessons and other educational math videos by a Pennsylvania cyberschool teacher. See, in particular, Buffington's channels on "Math That Makes you Think," "Math in Real life," and episode 1 and episode 2 of "What Kids Say About Math." ...more>>

  50. Escuela Virtual
    From Mexico, a non-profit organization offering a collection of links and documents in Spanish for students and teachers in secondary school. You can also write to someone who can answer your questions about homework or anything about school. Look for ...more>>

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