 Math Munch  Justin Lanier
A weekly digest of "the mathematical Internet" that has featured "lots of cool mathy things" online since October, 2011. Blog posts have included "Mazes, Spirals, and Paper Folding"; "Pennies, Knights, and Origami Mazes"; "Turing, Nets, and More Yoshimoto";
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 The Math Nook  Adrienne Shlagbaum
Blog by a New Jersey teacher of fifth and sixth grade math who also has math enrichment groups for grades 14. Posts, which date back to January, 2013, have included "Homework Review — A Work in Progress," "It's a Match! Fractions, Decimals, and
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 MathNotations  David Marain
Math investigations, challenges, problems of the day, and standardized test practice that emphasize the development of conceptual understanding in mathematics. Marain's blog, which dates back December of 2006, also features dialogue on issues in mathematics
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 mathontheedge  Sarah Caban
Blog by a K12 math coach from Maine who shares "... excerpts from lessons where teachers and students arrive at the edge of what they understand. I invite you to comment. What do you notice? What would you do next? How would you push the edge?" Posts,
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 MathPanelWatch
A "watcher's" view of the deliberations of the National Mathematics Advisory Panel, chaired by Dr. Larry Faulkner, and created to advise the President and Department of Education Secretary Margaret Spellings on the best use of scientifically based research
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 Math Perks  Kristin Perkins
Blog by a middle school math teacher from Clovis, California. Posts that date back to July, 2017, "... started with a little quote: Unless you measure what you value you'll end up valuing what you measure."
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 Math Planet
Hundreds of free video lessons, exercises, and examples to solve. Get help with prealgebra, algebra, or geometry by posting questions to Math Planet's forums. See also the downloads of SAT and ACT sample tests. The Swedish nonprofit organization behind
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 Math Planet  ThinkQuest 1998
A site for high school students featuring algebra, geometry, and geometry concepts glossaries; crash courses on basic Algebra and Geometry; an advanced course on Algebra and Trigonometry; a customizable lesson plan based on individual level; an SAT and
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 mathqa  Math Forum
A Web discussion archived by the Math Forum, and a mailing list operated by Nick Halloway, this is a robomoderated list for math discussion at college level and above. The following kinds of postings are discouraged: computer programming questions; Mathematica,
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 MathRecap  Dan Meyer, editor
A conference recapping site "modernizing and increasing access to math education conferences." Posts, which date back to November, 2012, have chronicled professional development sessions from the Northwestern Math Conference and annual and regional meetings
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 Maths and Statistics Lists  JISCmail
Searchable mailing lists browseable by month, thread, subject, or author. Introduction, welcome page, relevant files and links, names of list members, user guide, and FAQ for ach group.
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 Mathsational  Jennifer Abel
Blog by a math teacher at a suburban public high school in Lancaster, PA. Posts, which date back to June, 2015, have included "My first ever conference presentation & more on SBG"; "MTBoS Love — A Plethora of Activity Resources"; "Simplifying,
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 Maths Education and all that!  Rebecca Hanson
Blog by a UK lecturer in education and specialist in online discussion forums. Posts about maths education, which date back to April, 2011, have included "Developing a scaling primitive in multiplication and division"; "Visual Models in Arithmetic Operations";
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 Maths Express  MathsExpress.com
Des listes d'exercices classés par thèmes pour les élèves de terminales Baccalauréat S, Baccalauréat ES, et Baccalauréat L, corrigés pour la majorité; les annales du Concours Général
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 Maths Is Fun  Rod Pierce, mathsisfun.com
Math revision (review) pages, games, puzzles, and offline activities for age 11 through college algebra. A discussion forum and a newsletter are also available. The Illustrated Math Dictionary links definitions to further resources on the site. Maths
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 Maths is smART  Nicky Cleaver
Cleaver uses Matlab, Maple, and C++ to create dynamic images and videos which often exhibit some randomness, such as arbitrarily colored lines in pictures reminiscent of spirograph drawings. Posts, which date back to August, 2011, have included "Brownian
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 The Maths Magpie
"Loving shiny teaching resources and ideas  mathematical or otherwise." Blog posts, which date back to July, 2013, have included "What students see versus what the examiner sees," "Maths Vocabulary activities," "Posters for BODMAS / BIDMAS Misconception,"
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 Maths? No Fear!  Matt Skoss
Wiki for sharing practical ideas that engage kids in working as a mathematician, strategies for using Web 2.0 tools, and more. Become a member to access notes and other resources on the structure of maths tasks, problem solving, and more.
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 Maths & Physics Help Forum  Chris Muktar
An equationenabled message board for math and physics questions at all levels. Formatting algebraic expressions, rendering symbols, and other typesetting features require Java. Register to edit and delete your own posts; and to vote in forum polls.
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 MathsPig  Kerry Cue
Blog begun in March, 2009, aiming to "stick a snout in the media trough and sniff out the maths rubbish." MathsPig has since evolved to "use basic but elegant maths to make realistic problems for students to solve, e.g. 'Can you duck a bullet?'" Posts
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 Math Stack Exchange
A "free, communitydriven Q&A" for people studying math at any level, and professionals in related fields. Post to understand mathematical concepts and theorems, share hints on problems, solve mathematical puzzles, discuss software that mathematicians
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 MathSugarOff  Priscilla Bremser
"Notes on mathematics teaching and learning at all levels" by a Middlebury College mathematics professor who works with K8 teachers in the Vermont Mathematics Initiative (VMI) professional development program and conducts her undergraduate classes with
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 MathTango  Shecky Riemann
Interviews, commentaries, book reviews, and other musings by "a numberluvin' primate... enamored of math since childhood" who went on to study psychology and work as a technician in toxicology, neurobiology, and clinical genetics labs. Posts by the pseudonymous
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 Math Teacher  Erin Igo
Blog by a Delaware math coach. Igo began blogging in June, 2013 during the Emerging Communities for Mathematical Practices and Assessment (EnCoMPASS) institute.
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 Math Teacher Mambo  Shireen Dadmehr
Blog by a veteran high school teacher in Texas. Posts, which date back to January, 2005, have included "TAKS TAKS TAKS," "English Practice in Math Class," "Fraction Song," "Reviewing Angst," "Spaghetti Sine Curves," "Blocks & Pieces," "Memory Wheel,"
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 math.teaching.styles  Math Forum
math.teaching.styles is a newsgroup for mathematics educators at the K12 level. Read and search archived messages; and register to post to the discussions.
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 math.teaching.technology  Math Forum
math.teaching.technology is a newsgroup for K12 mathematics educators, focusing on the use of technology in the classroom. Read and search archived messages; and register to post to the discussions.
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 mathteach  Math Forum
A moderated discussion group (formerly nctml), accessible as a Webbased discussion, a mailing list, or a Usenet newsgroup, established to facilitate the discussion of teaching mathematics, including conversations about the NCTM Standards, although not
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 Math Thinking  David Wees
"Sharing thinking about math from students": a collection of work by students that teachers have not taught them explicitly how to do. Wees elaborates that "the idea or technique a student uses does not itself have to be completely original, just new
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 Math Tools Algebra II  Math Forum
A community library of software tools for algebra II students and their teachers. Algebra II is one section in the Math Forum's Math Tools digital library of software for computers, calculators, PDAs, and other handheld devices, with related lesson plans,
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 Math Tools Algebra  Math Forum
A community library of software tools for algebra students and their teachers. Algebra is one section in the Math Forum's Math Tools digital library of software for computers, calculators, PDAs, and other handheld devices, with related lesson plans, activities,
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 Math Tools Calculus  Math Forum
A community library of software tools for calculus students and their teachers. Calculus is one section in the Math Forum's Math Tools digital library of software for computers, calculators, PDAs, and other handheld devices, with related lesson plans,
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 Math Tools Discrete Math  Math Forum
A community library of software tools for discrete math students and their teachers. Discrete Math is one section in the Math Forum's Math Tools digital library of software for computers, calculators, PDAs, and other handheld devices, with related lesson
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 Math Tools Geometry  Math Forum
A community library of software tools for geometry students and their teachers. Geometry is one section in the Math Forum's Math Tools digital library of software for computers, calculators, PDAs, and other handheld devices, with related lesson plans,
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 Math Tools Grade 1  Math Forum
A community library of software tools for first grade math students (67 yearolds) and their teachers. Math1 is one section in the Math Forum's Math Tools digital library of software for computers, calculators, PDAs, and other handheld devices, with
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 Math Tools Grade 2  Math Forum
A community library of software tools for second grade math students (78 yearolds) and their teachers. Math2 is one section in the Math Forum's Math Tools digital library of software for computers, calculators, PDAs, and other handheld devices, with
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 Math Tools Grade 3  Math Forum
A community library of software tools for third grade math students (89 yearolds) and their teachers. Math3 is one section in the Math Forum's Math Tools digital library of software for computers, calculators, PDAs, and other handheld devices, with
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 Math Tools Grade 4  Math Forum
A community library of software tools for fourth grade math students (910 yearolds) and their teachers. Math4 is one section in the Math Forum's Math Tools digital library of software for computers, calculators, PDAs, and other handheld devices, with
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 Math Tools Grade 5  Math Forum
A community library of software tools for fifth grade math students (1011 yearolds) and their teachers. Math5 is one section in the Math Forum's Math Tools digital library of software for computers, calculators, PDAs, and other handheld devices, with
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 Math Tools Grade 6  Math Forum
A community library of software tools for sixth grade math students (1112 yearolds) and their teachers. Math6 is one section in the Math Forum's Math Tools digital library of software for computers, calculators, PDAs, and other handheld devices, with
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 Math Tools Grade 7  Math Forum
A community library of software tools for seventh grade math students (1213 yearolds) and their teachers. Math7 is one section in the Math Forum's Math Tools digital library of software for computers, calculators, PDAs, and other handheld devices, with
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 Math Tools Kindergarten  Math Forum
A community library of software tools for kindergarten math students (5 yearolds) and their teachers. Kindergarten is one section in the Math Forum's Math Tools digital library of software for computers, calculators, PDAs, and other handheld devices,
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 Math Tools PreCalculus  Math Forum
A community library of software tools for precalculus students and their teachers. PreCalculus is one section in the Math Forum's Math Tools digital library of software for computers, calculators, PDAs, and other handheld devices, with related lesson
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 Math Tools PreKindergarten  Math Forum
A community library of software tools for prekindergarten math students (up to 4 yearolds) and their teachers. PreK is one section in the Math Forum's Math Tools digital library of software for computers, calculators, PDAs, and other handheld devices,
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 Math Tools Probability and Statistics  Math Forum
A community library of software tools for probability and statistics students and their teachers. Prob. & Stat. is one section in the Math Forum's Math Tools digital library of software for computers, calculators, PDAs, and other handheld devices, with
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 Math Tools Trigonometry  Math Forum
A community library of software tools for trigonometry students and their teachers. Trigonometry is one section in the Math Forum's Math Tools digital library of software for computers, calculators, PDAs, and other handheld devices, with related lesson
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 Math Videos  James Sousa
Thousands of screencast lessons (look for a yellow background) and examples (grid paper), most ten minutes or shorter, all enlivened with narration and a highlighting pointer: arithmetic, algebra, geometry, trigonometry, calculus, linear algebra, differential
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 Math Warehouse  Vernon Morris
Interactive programs that allow users to explore math concepts; a set of freely available worksheets for teachers; math store with books, puzzles, and games; and a newsletter. Covers a range of topics including linear equations, systems of equations,
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 The Math Whisperer  April Brown
A blog that chronicles "the highs and lows of teaching, math thinking, and how technology can be incorporated into all three." Posts by Brown, who teaches second grade in Alberta, Canada, date back to September, 2011: "Technology Makes Me Giddy with Happiness,"
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 Math with Bad Drawings  Ben Orlin
Blog by a high school teacher in Oakland, California, "about the things I like [and] also about the things I can't do," in the hopes that their "juxtaposition captures the contradictory state of the teacher, of the mathematician." Posts "owning up to
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