 LessonSketch  The Regents of the University of Michigan
A suite of animated sketches of geometry and algebra instruction, and forum for ongoing conversations about mathematics instruction, for practicebased professional development of secondary mathematics teachers. LessonSketch "supports the creation, examination,
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 Let's Play Math!  Denise Gaskins
"As a homeschool mom who loves math, I want to help other homeschoolers see the variety and richness of the subject.... I hope this blog will be a place where we can play around with ideas about learning, teaching, and understanding math. (For me, it
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 LiteracyTentWiki
Wiki discussions on research questions using knowledge from research, experience teaching adult learners, or your experience as an adult learner. The table of contents includes topics such as Technology in the Classroom and GED Research.
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 LiveCube.com  Min Shih
A puzzlebuilding system: small colored cubes may be joined to create larger assemblies. Site includes puzzle models, discussion areas for puzzle designers and educators, and a catalog of puzzle components for purchase. Requires several plugins; files
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 Living Math!  Julie Brennan
A site dedicated to sharing resources for learning, exploring and enjoying math in a dynamic and holistic manner. The homeschooling author has "... found that math history and literature humanizes math, makes it come alive, and provides the context needed
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 l'île des mathématiques  Tom Pascal
"L'île des mathématiques propose des cours et des exercices de maths et de
physique.
Il est possible de télécharger les nombreuses fiches.
Aussi bien pour les élèves que pour les professeurs de collège et de lycée.
Des forums gratuits d'entraide sont
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 The Long Island Consortium for Interconnected Learning (LICIL)
The Long Island Consortium for Interconnected Learning in Quantitative Disciplines is a comprehensive, interdisciplinary project aimed at improving how faculty teach and how students learn in mathematically based subjects. It combines change in modes
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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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 MadMath  Daniel R. Collins
Blog by a math lecturer at Kingsborough Community College who believes that "Math is a battle. It is a battle that feels like it must be fought ...," and for whom "math isn't beautiful or fun, but it is powerful, and that's what we need from it." Posts,
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 Many Eyes  IBM
"Many Eyes is a bet on the power of human visual intelligence to find patterns. Our goal is to 'democratize' visualization and to enable a new social kind of data analysis...." View and discuss visualizations, view and discuss data sets, and create visualizations
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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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 March Mathness  Princeton University Press
Interviews and predictions of sports rankings experts, coaches, and mathematicians which take the power of mathematical methods of rating and ranking, and bring them to bear on the NCAA college basketball tournament. Princeton University Press invites
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 Marilyn is Wrong!  Herb Weiner
A searchable forum for discussion of Parade magazine's Ask Marilyn column, which regularly addresses logic puzzles. Organized into "Correct, but Incomplete," "You be the Judge," "Unsubstantiated Reports," and "She's Wrong!" With Frequently Asked Questions.
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 Matematica  Math Forum
Una lista de correo electrónico para tratar temas relacionados con Matemática (tanto temas técnicos como su historia, didáctica, etc.) y ciencias afines. A mailing list for topics related to mathematics (technical matters as
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 Math3ma  TaiDanae Bradley
Blog by a PhD student at the CUNY Graduate Center. For Bradley, "true meaning.... comes by reading and rereading, by working through problem after problem, and by writing." Posts, which date back to February, 2015, typically come in two parts: the basic
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 MathAction Online Services  Bill Page
Axiom is a general purpose Computer Algebra system. It defines a strongly typed, mathematically correct type hierarchy. It has a programming language and a builtin compiler. You can enter mathematics using LaTeX, Axiom commands, or Reduce commands, and
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 Math Activities  Education.com Inc.
Browse activities by grade levels. See also Education.com's reference articles and columns, as well as their free printable worksheets.
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 Mathalicious  Karim Ani
Relevant and engaging modular math lessons designed around realworld topics that students care about. Search the lessons by keyword; browse them by Common Core State Standards (CCSS), grade levels, topics, and themes: design, entertainment, health and
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 Math Archive for The Answer Sheet  Valerie Strauss, The Washington Post Company
Math education articles from The Washington Post blog of "everything you need to stay sane during the school years." Posts of this "school survival guide for parents (and everyone else)," which date back to 2009, have included "The trouble with algebra,"
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 MathArguments180.com
Subtitled "180 Days of Ideas for Discussion in Math Class," this blog of prompts dates back to January, 2014 with posts such as "Improperly Canceling Fractions," "Order of Operations is Wrong," and "Why 360?"
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 mathbabe  Cathy O'Neil
"Exploring and venting about quantitative issues." Blog posts, which date back to June, 2011, have included "KNearest Neighbors: dangerously simple," "Cool math books," "Women in math," "Mathematicians know how to admit they're wrong," and "Why log returns?"
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 mathblag  David Radcliffe
"Musings on math and teaching" by a math instructor at a community college in Minnesota. Posts, which date back to December, 2010, have included "Counting with Integrals," "The Euclidean algorithm and modular inverses," "A property of the divisors of
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 Mathblog.com  Antonio Cangiano
Promoting "the beauty of mathematics at every level" since 2007. Posts from Cangiano and other contributors, organized into such topics as books, math education, and history, have included "An accessible Calculus book and Benjamin Franklin's secret passion";
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 MathBlues.com  Rafiq Ladhani
Stepbystep explanations and worked problems "all about the new SAT." Browse the weekly articles by topics such as algebra, trigonometry, geometry, statistics, and "math art." This SAT preparation site for students also includes message boards, weekly
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 Math by the Mountain
Subtitled "teaching secondary mathematics in the Pacific Northwest," this blog dates back to July, 2016, with posts such as "How I Survived my First Year Teaching Math"; "Trig Ratio Posters for Geometry and Algebra 2"; "Questions on the Logistics of Spiraling
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 Math Central/Math Centrale  University of Regina, Regina, Saskatchewan, Canada
For K12 math education: a teacher resource room, a bulletin board, a questionandanswer service, and Teacher Talk, an email discussion forum. Teachers are encouraged to send resources and suggestions. Math Central is maintained by faculty and students
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 mathcoachblog.com  Bob Lochel
Blog by a math teacher "interested in effective technology integration in math classrooms, and developing lessons which challenge all learners to think mathematically." Posts, which date back to January, 2012, have included "What to do Before a Hurricane,"
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 Math Concentration  Wanda McDowell
Founded by a middle school teacher in Florida to "share best practices and provide free and low cost resources like budget effective activities, incentives, math centers, and classroom management strategies." McDowell's site also provides middle school
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 MATHCOUNTS  MATHCOUNTS Foundation
A national math coaching and competition program that promotes 7th and 8th grade math achievement through grassroots involvement in every U.S. state and several territories. At the beginning of each school year, the MATHCOUNTS Foundation distributes,
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 Math Craft  Cory Poole, administrator
A community "dedicated to the exploration of mathematically inspired art and architecture through projects, community submissions, and inspirational posts." Share images, videos, and other resources on the corkboard; post questions to the forum. The blog
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 Matheatre  Sadie Bowman and Marc Gutman
Blog of the performers starring in "Calculus: The Musical!" This comic "review" blend of sketch comedy, musical theatre, and lecture about the concepts and history of calculus emerged as a teaching tool from the classroom of Gutman, who "... found that
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 Mathe Board  Math Community
A German Community helping mathematics students. With discussion board, puzzles, and more.
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 MatheBoard  Rainer Mueller
A public forum for discussion of mathematics. In German.
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 mathedcc  Math Forum
A discussion group dedicated to discussions of all topics relating to mathematics education. Read and search archived messages; and register to post to the discussions.
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 MathEd.net  Raymond C. Johnson
Blog begun in October, 2009, by a math education graduate student. Dedicated to "building bridges between research, policy, and practice," Johnson's posts have included "Patterns of Patterns," "RYSK: Erlwanger's Benny's Conception of Rules and Answers
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 MathEd Out
Subtitled "the search for the Perfect Math Lesson," this blog "came out of a vision to see math teachers coming together to share things that work in the classrooms." Posts, which date back to November, 2013, have included "Podcast Launch featuring Julie
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 mathed studies  Erlina Ronda
Synthesis and summaries of research studies about teaching and learning mathematics and teacher education. Blog posts, which date to March, 2012, have included "Building understanding of algebraic variables," "Intuitive nonexamples: the case of triangles,"
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 mathedu  David Epstein, Math Forum
Hosted by David Epstein at the University of Warwick, this mailing list is set up to discuss issues in Mathematics/Education at the postcalculus level, meaning a first course in calculus, such as is normally given to first year university students in
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 Mathematical/Abstract Games in Portuguese  Jorge Nuno Silva
A site devoted to mathematical games: find information about the games and their strategies, exchange them online, compete in contests such as the Campeonato Nacional de Jogos Matemáticos (CNJM), participate in discussion forums, and more. Games
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 Mathematical Interactivities  David Hellam
Interactive mathematical challenges, mostly written in Flash, covering number, algebra, data, shape, and space for K12 students. Site also includes a forum for teachers to discuss this sort of resource, its development, and its use in the classroom.
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 Mathematically Speaking
"Thoughts and ideas about mathematics in the media, popular views of mathematics, and being a mathematician." This college professor's posts, which date back to April, 2009, have included "Crocheting and Hyperbolic Space," "Topology and the Moore Method
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 Mathematical Palette  Guillermo Bautista
A blog that "highlights the lighter side of mathematics.... photos, paintings, songs, poems, jokes, animations, graphics, games, and puzzles and the mathematics within and about them." Posts, which date back to February, 2012, have celebrated "mathematical
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 Mathematical Poetry  Kaz Maslanka
Blog mainly of "equational poetry," which the author describes as "an artistic expression created by performing mathematical operations on words or images." Posts of "math as a language for connotation," which date back to February, 2005, have included
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 Mathematical Sciences Digital Library (MathDL)  Mathematical Association of America (MAA)
The MAA's Pathway project within the National Science Digital Library, this site combines the earlier MathDL and Math Gateway sites. The online publication Loci continues the tradition of the three earlier online publications (JOMA, DCR, and Convergence).
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 The Mathematical Tourist  Ivars Peterson
"Cool stuff" that Peterson, the Director of Publications and Communications at the Mathematical Association of America (MAA), encounters while "browsing the world of mathematics and computer science: new developments in math and its applications, old
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 Mathematicians in Math Education  Mathematics Education at the Math Forum
A page designed to document and encourage productive involvement of mathematicians in K12 education, from Susan Addington and Judy Roitman. How to join discussions and get involved, with relevant readings.
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 A Mathematician's Musings  Ethan Weker
Blog by a Menlo Park (CA) teacher of algebra, geometry, trigonometry, and precalculus. Posts, which date back to September, 2014, have included "When We Make Math Look Too Easy"; "Math as a Historically Collaborative Effort"; "When Plans Go Awry"; "Brainstorming
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 The Mathematician's Shirt  Collins, Julia; and Shepherd, Madeleine
A collaboration between mathematician Julia Collins and artist Madeleine Shepherd to "design and create a series of sculptures made out of shirts and representing different concepts in mathematics." With funding by the Art Science Collaborative (ASCUS),
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 Mathematics
This blog of instructional posts, which dates back to January, 2011, has included articles that introduce concepts of scale factor, logarithms, calculus, surds, and more.
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 Mathematics and Multimedia  Guillermo Bautista
Blog about mathematics, teaching, learning, and technology. Begun in October, 2009, it has included posts such as "GeoGebra Tutorial 4  Graphs and Sliders"; "Screencasting Tutorial: Making a Math Video Lesson Using Camstudio"; "Derivative in Real Life
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