 The nCategory Café  John Baez, David Corfield, and Urs Schreiber
A blog devoted to "that heady interface between physics, mathematics and philosophy." Read posts, many with MathML, that date back to August, 2006.
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 NCTM Standards 2000 Discussion Area  NCTM/Math Forum
Discussions devoted to public input on the NCTM Standards 2000 project. Questions posted by the moderator include such concerns as areas of mathematics deserving of emphasis, mathematical thinking skills, philosophies and practices, basic skills and conceptual
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 Newtechtimeline  Tom Riley
Blog by a teacher of mathematics and New Technologies Coordinator at the de Ferrers Academy, Burtonon Trent, UK. An Apple Distinguished Educator (class of 2013), Riley has posted since January, 2012: "How not to use Google Sites for your (Maths) classes,"
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 Nix the Tricks
Problematic vocabulary, notation, mnemonics, and other shortcuts reconsidered and "fixed" by teachers who "want to put a stop to the superficial, cheap tricks that have infected the teaching and learning of math." Submit your own trick, or debate and
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 The NODE Learning Technologies Network  The NODE Learning Technologies Network
theNode.org provides networked support for instructors, trainers, designers and administrators with a professional interest in teaching with technology. Register for membership online. Internet resources for the study and teaching of mathematics include
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 NumberADay  The Mathematical Association of America (MAA)
Every working day, a new positive integer, with a selection of its properties and an illustration or photograph.
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 Number Loving Beagle  Megan Schmidt
Blog by a high school teacher in Minnesota who also serves as the head of her math department. Posts, which date back to September, 2013, have included "Aha for patient problem solving"; "Creating Mathematically Curious Students"; "A Speedy Makeover for
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 Number Loving  Laura ReesHughes and Sharon Derbyshire
Freely downloadable PDFs, Microsoft Word documents, and PowerPoint presentations, organized by UK key stages, strands, and topics. The Number Loving blog offers new approaches for teaching maths and tips for classroom makeovers. Posts, which date back
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 A Number of Things  Karyn Vogel
Blog where a K5 Math Coach in Burlington (VT) "shares ideas and resources related to mathematics and education." Posts, which date back to October, 2011, have included "Math and Image," "A new way of problemsolving," "Sugar and Ice book review," "Plus
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 Numberplay  The New York Times
Mathematical, logical and scientific puzzles, with solution "recaps." The posts, by Gary Antonick and Pradeep Mutalik, have included "Surreal Hat Tricks," "The Puzzles of Pickover," "Prime Rib at Hogwarts," "Nim for (a) Change," "Phi  The Magic and the
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 The Number Warrior  Jason Dyer
Blog by an algebra and calculus teacher. Posts, which date back to January, 2008, have included "The Educational Problem with Teaching Multiplication as Repeated Addition," "Nonlinear lesson design (Giant Ants of Doom)," "The design of mathematical notation,"
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 numeracy  Adult Numeracy Network, Math Forum
A mailing list for those interested in the discussion of educational issues around adult mathematical literacy (ABE/GED/ESL, workplace, and literacy teachers, tutors, and adult learners), maintained by the Adult Numeracy Network (ANN). Read and search
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 nyscollmath  Math Forum
The college level mathematics discussion group of the Association of Math Teachers of New York State. Anyone interested in math education beyond high school is welcome to join. Read and search archived messages; and register to post to the discussions.
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 nysmath48  Math Forum
The discussion group of the Association of Math Teachers of New York State dedicated to the "Grade 4" and "Grade 8" Math Assessments. Teachers, administrators, NYSED personnel, and anyone interested in this NY statespecific topic are encouraged to take
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 nysmathab  Math Forum
The discussion group of the Association of Math Teachers of New York State dedicated to the "Math A" and "Math B" Assessments. Teachers, administrators, NYSED personnel, and anyone interested in this NY statespecific topic are encouraged to take part.
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 nysmhs  Math Forum
The discussion group of the Association of Math Teachers of New York State's Math Honor Society. All NYSMHS members are encouraged to join this group, as are others who wish to converse about statewide math honor societies. Read and search archived messages;
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 nysmmn  Math Forum
The discussion group of the Association of Math Teachers of New York State's Math Mentor Network. This list is specifically for Elementary Math Mentors in the state, but welcomes all who have an interest in elementary math education. Read and search archived
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 OER Commons  Institute for the Study of Knowledge Management in Education
An open learning network for teachers and professors to access their colleagues' course materials, share their own, and collaborate. The Open Educational Resources site features tags, ratings, comments, reviews, and social networking functions, as well
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 Off The Hypotenuse  Glenn Kenyon
Kenyon started this blog in pursuit of "a good discussion of resources, ideas, and innovative ideas for teachers of Algebra." Humorous videos, comic strips, and posts, which date back to March of 2007, have included "Math Lessons learned from Karate,"
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 one good thing
Blog by a group of "dedicated, fascinated, hardworking, inspiring" secondary teachers who believe that "every day may not be good, but every day there is (at least) one good thing worth sharing. Here are our stories." Posts, which date back to January,
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 Online Math Education  Yordan Petrov Petrov
Math tutorials and quizzes, with some math history information as well. Includes a discussion forum. Available in English or Bulgarian.
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 OpenMathText.org  David A. Santos, Alain Schremmer
OpenMathText.org is a depository of free, downloadable texts and is primarily dedicated to the specification, development, and dissemination of free, editable and downloadable mathematical texts aimed, mainly, at "just plain folk." OMTo invites registrants
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 Open Problem Garden  Matt DeVos and Robert Šámal
A collection of unsolved problems  mainly, graph theory, combinatorics, and number theory. A wiki for each open problem includes relevant bibliographical citations, importance rating, and recommendation for undergraduates. Navigate by math subject,
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 Orig4mi  Jorge C. Lucero
Origami na ciência, tecnologia e design. Desde outubro, 2008, este profesor da Universidade de Brasília tem escrito neste blog artigos diversos sobre origami, inclusive abrigos dobráveis de bambu, origami com moléculas de DNA,
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 Overthinking My Teaching  Christopher Danielson
Blog by a community college math teacher "interested in hard questions about teaching." Posts, which date back to July, 2009, have included "Wump hats," "An unnoticed rule for number language," "The end of word problems," "Cubeyness," "Cardinal and ordinal
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 The Pai Intersect  Jimmy Pai
Blog by an Ottawa (Canada) secondary mathematics teacher and graduate student in education. Posts, which date back to August, 2012, have included "Understanding Fraction Division #2  Part 1," "$100 Tablet Project," "Spiraling through the curriculum,"
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 Palmer's Ponderings  Christina Palmer
Blog by a high school math teacher in Massachusetts. Posts, which date back to June, 2013, have included "I wonder...... (Cheerios in a chimney box)," "Four = Eight (almost)," "Today I Shut Up," "State Test Questions That Make Me Angry," "TMC14," "Compounding
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 Park School Math  Park School of Baltimore
The math teachers at The Park School (Baltimore, MD) agree that "learning how to think is at least as important a part of a good mathematics education as is the core content.... However, we are all in constant friendly mutual disagreement about how best
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 Pearson Learning  Dale Seymour Publications
A leading publisher of educational materials, emphasizing math, science, and the arts. The site contains: an online catalog; math curricula include: CMP (the Connected Mathematics Project) and Investigations (Investigations in Number, Data, and Space,
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 Peg Cagle's Math Education News & Views You Can Use  Peg Cagle
Blog by a secondary math teacher in the Los Angeles public schools where she "shares news, views, and whatever I choose, all with an eye to issues impacting K12 math education instruction, curricula, research and especially policy." Posts, which date
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 Perplexus  flooble
A large archive of mathematically inclined puzzles and problems displayed by category. Includes logic, number theory, geometry, probability and other problems. All are rated by difficulty and quality and discussed in depth by visitors. Most with solutions.
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 PhD! ... plus epsilon  Adriana Salerno
Having earned her math doctorate in 2009, Salerno writes "about some of the challenges I've encountered while teaching, attempting to do research, and the lesser known aspect of 'service'" on institutional committees. In addition to blogging about "publish
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 Physics Forums
Discussions emphasize physics, but "PF" also includes an entire directory on mathematics: General Math; Calculus & Analysis; Differential Equations; Linear & Abstract Algebra; Topology & Geometry; Set Theory, Logic, Probability, and Statistics;
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 Planet Math
Designed to be a central repository for mathematical knowledge on the web, with a pedagogical slant. All content is usercontributed, either to the Encyclopedia or to the reviewed listings of papers, books, and lecture notes. Polls, discussions, and feedback
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 Planetqhe (Probabilistic Learning Activities Network)  David Kay Harris
Outoftheordinary probability problems. The site focuses on using methods of probability to solve counterintuitive problems and deepen students' understanding and competence in the domain. Sections include: a brief history and rationale of the site;
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 The polymath blog  Timothy Gowers
Massively collaborative mathematical research projects discussed and hosted here have included IMO Q6 2009, Density HalesJewett, Embedded c_0 or lp in explicit Banach spaces, and Finding primes deterministically. Proposals include Boshernitzan's problem,
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 powersfulmath  Brooke Powers
Blog by a Kentucky middle school teacher sharing "some of the ways I try and bring math to life for my students." Posts, which date back to February, 2014, have included "Standards Based Grading When You Can't Really Standards Based Grade," "Why I Always
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 Powersim
A simulation software development company, offering consultant and support services for simulator design, construction, and use as well as the complementary software needed to build models and simulators. The site offers discussion groups, products, newsletters,
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 Powers of Ten  Eames Office
An "adventure in magnitudes" that depicts the relative scale of the universe in factors of ten, originally written and directed by Ray Charles Eames in 1968. Starting at a picnic by a Chicago lake, every ten seconds this nine minutelong documentary short
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 PreCalc/Calculus (Math for Morons Like Us)  ThinkQuest 1998
Lists of important concepts, a quick reference sheet with key calculus formulas, and a calculus message board.
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 The Precalculus Weblet  Dynamic Educational Materials
A partially online precalculus course with the following centers: Instruction (extending the instructional opportunities beyond the textbook; see Explore the Concepts and Starred Exercises), Reference (technology, glossary, history, sites that complement
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 Proactive Play  Punitha Jayaraman
Articles on cognitive development research into, and activities to improve, spatial skills. Posts, which date back to October, 2012, have included "Hari Builds with Construction Set," "Piaget and van Hiele: Compare, Contrast and My Thoughts ...," "Hari's
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 Problem Problems  Michael Pershan
Blog by a New York City math teacher trying "to better understand the connections between problem solving, learning, and teaching." Posts, which date back to May, 2015, have included "Getting Stuck on a Geometry Problem," "Minimalistic Hints Are Still
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 Productive Struggle
Group blog, with most contributions by secondary math and science teachers, that aims to "push teachers to learn in the same way that we push our students to learn" and "work together to make our struggles productive." Posts, which date back to March,
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 Project Based Learning Pathways  David Graser
A blog about real life projects suitable for college math courses such as algebra, finite math, and business calculus. Most of these applied math projects include handouts, videos, and other resources for students, as well as a project letter. Graser,
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 project Eureka
project Eureka is a collaboratively edited site for problem solvers/creators—regardless of problem or field. Add problems with quantifiable results; or group problems in a test.
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 PROMYS: The Program in Mathematics for Young Scientists  Boston University Department of Mathematics and Statistics
PROMYS encourages ambitious high school students to explore the creative world of mathematics. Each summer, approximately 60 high school students from around the country gather on the campus of Boston University for six weeks of rigorous mathematical
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 P Torres blogger  Paula Torres
Blog by an AP Calculus teacher at a public high school in Rancho Cucamonga (CA). Posts, which date back to February, 2014, have included "Beginning to flip," "The wonder of Desmos," "Calculus around the room and 'the Statistics talk,'" "They won't fall
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 PuraMate
Ejercicios e soluciones de ecuaciones de primer grado, ecuaciones de segundo grado, algebra de Baldor, polinomios, producto y cociente notable, binomios, trinomios, desigualdades, y inecuaciones. Un blog empezó en octubre, 2014, tiene entradas
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 Puzzle Zapper  Alexandre Owen Muñiz
Original mathematical puzzles, some available in lasercut acrylic for sale: polyomino common superforms, pentomino coloring problems, miscellaneous polyomino explorations, flexible polyforms, square grid puzzles, visualizing sequences of numbers, Lissajous
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