 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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 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 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 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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 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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 Mathematics  Answerway.org
Read question boards and discussion forums on a range of math topics. Join to post questions and answers. Answerway is an online information and communications service that allows volunteers with specific expertise to answer questions posted by people
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 Mathematics by Mr. P  Mike Poliquin
Middle school math teacher Poliquin began this blog, subtitled "making sure everyone gets it," in December, 2011. Posts have included various original problems of the week; "Eudoxus of Cnidus: the First Mathematical Superstar"; "A Quick Dip in the Deep
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 Mathematics Education in China Discussions  Math Forum
A discussion group dedicated to questions raised by Dianzhou Zhang, Professor of Mathematics, East China Normal University, Shanghai, who cochairs a commmittee charged with redesigning high school mathematics education in all of China. Read and browse
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 Mathematics Educators Stack Exchange
A "free, communitydriven Q&A" for those who teach mathematics. Post, answer, and vote up or down questions such as "Advantages on repeating question in student's answer," "How can we help students who are very anxious about math?" and "Should I design
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 Mathematics for Teaching  Erlina Ronda
Ronda, who teaches math and trains teachers, blogs to "narrow the gap between mathematics education research and practice in mathematics teaching and learning." The Mathematics for Teaching (M4T) blog, begun September, 2009, offers teaching tips based
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 Mathematics, Learning and Web 2.0  Colleen Young
Blog by a teacher and trainer in mathematics and information technology (IT) with "a keen interest in how new technologies can deepen the learning experience for students." Posts, which date back to January, 2009, have included "Manga High," "Graphing
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 Mathematics Learning Forums  Education Development Center, Inc. (EDC)
The Mathematics Learning Forums offer teachers the opportunity to do mathematics with their students and talk about mathematics with their colleagues through online seminars. The forums are designed to help teachers introduce new mathematics teaching
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 Mathematics Tutorials and Help  Sophia Learning, LLC
Math packets, playlists, peoples' profiles, questions, and answers from this social teaching and learning platform, akin to "a mash up of Wikipedia, YouTube, and Facebook" for teachers and learners.
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 Mathematik für die Schule  Kevin Görner
German language explanations for high school mathematics: basics, relations, derivatives, symmetry, and functions.
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 MatheMazier  Oluwasanya Awe
Blog about "problem solving, updates on some Olympiads, and also about Africa." Posts, which date back to October, 2012, have included "IMO 2011 Problem 2 (The Windmill Problem)," "Number of Zeros 1000! Ends With," "The Nigerian PanAfrican Maths Olympiad
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 Math Exercises
Interactive exercises, lessons, and worksheets to practice knowledge of whole numbers, integers, divisibility, fractions, exponents and powers, percentages, proportional reasoning, linear equations, quadratic equations, monomials, polynomials, special
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 Math for America
An organization with the mission of improving math education in our nation's public schools. Download PDFs from MfA's Lesson Plan Database according to math subject, topic, technology, duration, level, and activity structure, which includes the categories
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 Math for Grownups  Laura Laing
From the author of the book by the same title. Laing, a "selfproclaimed math evangelist," has blogged since May, 2011: "Math Secret #1: There’s More Than One Way to Skin a Math Problem," "Math at Work Monday: Kim the Copywriter," "Math at Work Monday:
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 Math for Morons Like Us  ThinkQuest 1998
Students talk to students about math: a site designed to help you understand math concepts better. Tutorials, sample problems, and quizzes for PreAlgebra, Algebra, Geometry, Algebra II, and PreCalc/Calculus, designed assuming you know some of the basic
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 Math foru' : les maths ont leur forum !  Thierry Planterose
In French: Forum de mathématiques destiné aux collégiens, lycéens, étudiants.
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 Math forum
A math questionandanswer discussion forum.
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 MathFour  Bon Crowder
Articles, interviews of fellow mathematician parents, narrated videos of paperandpen math techniques, and other resources for homeschooling and afterschooling parents. Crowder, an instructional strategist by day, seeks to get parents to feel "comfortable
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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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 MathGroup, the Email Group for Mathematica Users  Steven M. Christensen and Associates, Inc.
MathGroup is a moderated electronic mail list for Mathematica users. Many of the leading experts on Mathematica inside and outside of Wolfram Research read and respond to user comments and problems. The site includes Mathematica Benchmark Sites, Mathematica
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 Math Help Forum
Help with homework, projects, games, and more. Register to participate in six online discussions: Elementary and Middle School Math Help; High School Level Math; College Level Math; Math Lounge, for conversations on topics such as brain teasers and more
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 mathhistorylist  MAA, Math Forum
An unmoderated group hosted by the Mathematical Association of America (MAA) and dealing with the history of mathematics, including announcements of meetings, new books and articles; discussion of the teaching of the history of math; and questions that
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 math hombre  John Golden
Golden, a math professor at Grand Valley State University (Michigan), blogs to "share my math interests on the web, post new materials for elementary, secondary and teacher ed, and vent mathematical steam when needed." Posts, which date back to April,
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 Mathie x Pensive  Gregory Taylor
Musings on mathematics, teaching, and more by an Ottawa (Canada) high school math teacher who majored in computer science and graduated from the mathematics program at the University of Waterloo before receiving his B. Ed from Queen's University. Posts,
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