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  1. Deep in the Jungles - Ivars Peterson (MathTrek)
    Humans are predisposed to seeing order and meaning in a world that too often presents random choices and chaotic evidence. Random events sometimes get linked into a meaningful, though ultimately bogus, scenario... At the same time, the mathematics of ...more>>

  2. Determinación Geométrica de los Números Primos y Perfectos - Omar E. Pol
    Un breve ensayo en que "se describe la geometría que determina la distribución exacta de los números primos y también de los números perfectos. Se ilustra el texto con diagramas originales; se muestra el modelo principal ...more>>

  3. Developing Algebraic Thinking - Suzanne Alejandre
    Teacher lesson plan and student kinesthetic activities on the Traffic Jam activity and applet, as originally published in the inaugural (Fall, 2002) issue of ON-Math, an electronic journal of the National Council of Teachers of Mathematics (NCTM). ...more>>

  4. Didax Educational Resources
    Didax publishes and distributes books, manipulatives, and software for math, reading, science, and art. The site offers free demo software, product descriptions, information requests, technical support, and current national educational standards. Didax ...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 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>>

  8. Divisible by 3 - Andrew Stadel
    Stadel has taught pre-algebra, algebra, and geometry in middle school since 2004. His blog about "interactions with math, logic, life, teaching, and the web they spin together" dates back to March, 2012, with posts such as "Survey your students"; "2012 ...more>>

  9. 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>>

  10. Divisor Plot - Jeffrey Ventrella
    "We hear of primes described as the 'building blocks' of all numbers. Let's turn that concept on [its] head. Instead, let's think of primes as the negative spaces behind complex objects. Imagine a series of picket fences stacked in front of each other. ...more>>

  11. The Doctor X Amazing Griddable Multiplication Contraption - Gordon Anderson
    Click a color from the left of this 10×10 JavaScript array, then paint the grey boxes with it to illustrate how rectangular area, multiplication, and the distributive property interrelate. As products color the grid, the column on the left dynamically ...more>>

  12. Dominoes Activity - Suzanne Alejandre
    A classroom activity (similar to Pentomino + 1 = Hexomino; a variation on polyominoes) aligned to the NCTM and California Standards, to be explored through manipulatives (paper dominoes). Students explore whether it is possible to cover a 6x5 grid with ...more>>

  13. Dot Patterns and Sierpinski Gasket - Cut the Knot!, Alexander Bogomolny
    How many ways are there to define the Sierpinski gasket (also, the Sierpinski triangle)? The author has counted a respectable 9 but would be happy to learn of more. An applet with rows of digits or circles with colors corresponding to the digits shows ...more>>

  14. DragonBox - WeWantToKnow AS
    "Secretly teaching algebra to your children" by letting them discover algebraic rules, play with them, then use the rules to solve puzzles through trial and error. See testimonials and videos about this multi-platform math game created by WeWantToKnow ...more>>

  15. Dramatic Results
    This non-profit educational arts agency improves students' academic confidence and performance "by stimulating curiosity and fostering creativity through a hands-on, arts-based approach to learning." Dramatic Results specializes in curriculum that integrates ...more>>

  16. DreamBox - DreamBox Learning, Inc.
    Online, standards-based math adventure games for individualized learning in kindergarten, 1st grade, and 2nd grade. See-a-lesson and register a trial account. The site also offers parents free "printables," tips, research articles, and other downloads, ...more>>

  17. Dr Mike's Math Games for Kids - Michael Hartley
    Free printable and online math games for kids: traffic jam, times tables, magic square, magic hexagon, sugar sugar, Archimedean tilings, magical calculator birthday trick, and more. Newsletters include Monday Morning Math, with what math says about daily ...more>>

  18. 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>>

  19. Early Algebra Thinking - Bethany Rittle-Johnson
    Evaluating the role of explanation in mathematics learning — specifically, "why" explanations, or reasoning about why something is true. See, in particular, the abstracts, published articles, and coding schemes and other instruments from Rittle-Johnson's ...more>>

  20. Easing the Hurry Syndrome - Jennifer Wilson
    Blog by a teacher in Flowood (Mississippi) whose course load includes Advanced Placement Calculus and Geometry. Posts often begin with alignments to relevant Common Core State Standard (CCSS) and feature screenshots of TI-Nspire CAS Navigators, with original ...more>>

  21. Education by Design
    Publishers of educational software, focusing on special needs software for Windows and Macintosh that can be accessed with keyboard, mouse, and especially with IntelliKeys, Touch Windows or with switches. Math titles include MathPad, an arithmetic tutorial ...more>>

  22. 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>>

  23. 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>>

  24. 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>>

  25. Elementary Thoughts: A Collection of Gail's Responses - Gail Englert
    A collection of Gail Englert's responses to questions from elementary and middle school teachers, parents, and students, in the Teacher2Teacher service. Covers a wide range of elementary mathematics topics, as well as teaching points. ...more>>

  26. El Niño Unveiled - Marcia Barton, Susan Freeman; Louisiana State University
    What is El Niño? This three-day interdisciplinary Webquest for middle grades students combines natural history, math, and writing to introduce activities and research centered around El Niño-Southern Oscillation (ENSO) - its history, cause, ...more>>

  27. emGames - Wright Group/McGraw-Hill
    Twelve Shockwave games aligned to the Everyday Math curriculum for the early grades. Game topics include the basic operations (including angle addition), place value, money, estimation, factoring, and choosing the larger of two numbers. Many games involve ...more>>

  28. 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>>

  29. Euler and Erdős - Jean Pierre Mutanguha
    Blog of self-described amateur research in tribute to Leonhard Euler and Paul Erdős, "muses" to an author who considers it "hard to find math blogs aimed at undergraduates." Posts, which date back to May, 2013, have included "Envelopes and Astroids," ...more>>

  30. Finding Ways to Nguyen Students Over - Fawn Nguyen
    Nguyen blogs mostly about her teaching middle school math. Posts, which date back to November, 2011, have included "Teaching 101 -- How I Got Like This," "Puzzles and Brainteasers, Set 11," "Pi Day Activities," "Always Sometimes Never," "Using Excel for ...more>>

  31. Five Twelve Thirteen - Dylan Kane
    Blog by an eighth grade math teacher in Boston. Posts, which date back to October, 2012, have included "Assessment & Rigor," "Pythagorean Triples Function," "Construct Viable Arguments and Critique the Reasoning of Others," "Guatemalan Sinkhole," "Problem ...more>>

  32. Flash Games - ATK Solutions, Inc.
    Flash applets and games include rotating 3d cube; mind boggle square, which challenges you to slide a square across a surface by sliding other quadrilaterals into the unoccupied spaces; Futoshiki, which involves positioning counting numbers on a grid ...more>>

  33. Focus on Student Practice - Suzanne Alejandre
    Article about how students worked on the Problem of the Week (PoW) "Wooden Legs" in a way that developed the Common Core State Standards (CCSS) Mathematical Practice of "making sense of problems and persevering in solving them." This article, originally ...more>>

  34. Fractals: Definition & Activities - Suzanne Alejandre
    A Math Forum Web Unit. Includes definitions and descriptions of fractals, links to pages on the Sierpinski triangle, the Koch edge, the Peano curve, the Lorenz attractor, and the Dragon curve; and more links to fractal sites on the Web. ...more>>

  35. Fractals in Science: Simulations - Center for Polymer Studies, Boston University
    Hands-on activities, laboratory experiments, and interactive visualization programs that encourage students to explore how fundamentally random microscopic events can give rise to fractal macroscopic patterns. An image gallery and fractal related software ...more>>

  36. fractionfanatic - Julie Morgan
    Blog by an Australian who has taught high school maths in the Scottish Borders since 2004. Posts, which date back to December, 2015, have included "Learning Intentions and PPPB (Pose Pause Pounce Bounce)," "#MTBoS12days Moment that challenged me," "Quadratics ...more>>

  37. Franklin's Mathematics - Paul C. Pasles, Villanova University
    From the author of Benjamin Franklin's Numbers: articles on the founding father's "little-known role as a mathematician," and examples of Franklin's magic squares and magic circle. ...more>>

  38. Fun With Num3ers
    A blog of mathematical puzzles, mostly in number theory. Posts, which date back to January, 2012, have included "Using digits 1, 2, 3, 4, 5, 6, 7, 8 and 9 only once (Part Two)," "Pythagorean triple – Digits Reversed," "Concatenation puzzle: when (A || ...more>>

  39. Games and Puzzles - Interactive Mathematics Miscellany and Puzzles, Alexander Bogomolny
    Almost 40 games or puzzles, with extensive discussions and solutions. Examples include the Monty Hall Dilemma, Lewis Carroll's problem; the game of Nim, the 3 glass puzzle, Northcott's game, the Tower of Hanoi, and many more. Most require a browser capable ...more>>

  40. Gary Haynes - Gary Haynes
    Course syllabi, lesson plans, homework, and objectives. Visit "Tangrams and Other Games" for an interactive tangram story and a Flash presentation on how to develop an understanding of functions through the use of the motion sensor. ...more>>

  41. GEM: Gateway to Educational Materials - National Library of Education (NLE)
    A database for education links, intended to be more useful for teachers than a search engine. It records the resources of its consortium members (information on joining the consortium is available onsite). Users are able to: browse through lists organized ...more>>

  42. Geometric Arts - Ghee Beom "Quincy" Kim
    A site dedicated to geometry and visual perception: patterns, fractals, structures, rotations, spirographs, optical arts, knots, and more. Some constructions include the artist's reflections, instructions, and links to related sites and interactive applets. ...more>>

  43. Geometry Out of Africa - Ivars Peterson (MathTrek)
    Two recent books that introduce African geometry. Geometry from Africa, by Paulus Gerdes, shows how one can discover or derive the Pythagorean theorem from African designs, explores the role of symmetry (with suggestions for home and classroom crafts ...more>>

  44. Geometry through Art - Norman Shapiro
    Lesson ideas, facilitation suggestions, lists of materials needed, and handouts to photocopy. Norman Shapiro focuses on the student as investigator, learning through doing, and using perception to stimulate the motivation for more developed concepts and ...more>>

  45. Got Math? - Dave Radcliffe
    Blog by a community college math instructor and self-described "GeoGebra fanatic." Posts, which date back to December, 2010, have included "Stacking cannonballs," "Counting with Integrals," "A Paradoxical Dissection," "Gelfand's Question," "Imagining ...more>>

  46. Greg Tang Math - Greg Tang
    Educational materials that combine problem-solving and arithmetic, and integrate math with language and art, from the author of The Grapes of Math, Math For All Seasons, The Best of Times, Math Appeal, Math-terpieces, Math Fables, and Math Potatoes. In ...more>>

  47. Growing Exponentially - Heather Kohn
    Blog of "reflections on teaching math and striving to do better each day than the last." Posts, which date back to August, 2012, have included "Olympic Fever," "Work in your head, Points in my head," "Graphing Calculator Activities," "Absolute Value Project," ...more>>

  48. Habits of mind: an organizing principle for mathematics curriculum (Connected Geometry) - Cuoco, Goldenberg, Mark; Education Development Center, Inc. (EDC)
    A curriculum the goal of which is not to train large numbers of high school students to be university mathematicians, but rather to allow high school students to become comfortable with ill-posed and fuzzy problems, to see the benefit of systematizing ...more>>

  49. Hand Made Manipulative Instructions - Margo Lynn Mankus
    Pattern block cutouts: triangles, squares, smaller and larger rhombuses, trapezoids, and hexagons. Base-ten blocks in sets of ones, tens, and hundreds; and base-five blocks in sets of ones, fives, and twenty-fives. XY-block sets of X, X2, XY, Y, and Y2 ...more>>

  50. Harry O'Malley
    Blog by a math teacher who believes "... that learning to use mathematics changes people's lives in profound and valuable ways," and describes himself as "obsessed with making that happen for people. I am convinced that recent advancements in technology ...more>>

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