 I Support the Common Core  McCallum, Bill; and Zimba, Jason
Blog "for people who want to be active in support of the Common Core State Standards" (CCSS). Posts, which date back to August, 2013, have included "Cathy Kessel critiques the critiques," "A mathematician on the rigor of the Common Core," "The Coming
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 James Poon Online Classroom  James Poon
Online instructional mathematics videos; a discussion forum; and articles on study skills.
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 Jaz_math  Jasmine Walker
Blog by a Vermont teacher of ninth grade math (integrated algebra and geometry) and calculus. Posts, which date back to August, 2012, have included "'I Was Never Good At Math Either,'" "Twitter Math Joy," "TI83 Programming Project for Coordinate Geometry,"
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 Jeremy Kun
Primers, galleries of computer programs and math proofs, and more befitting "a place for elegant solutions." Kun, a mathematics PhD student at the University of Illinois in Chicago with a background in computer science, has also blogged since September,
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 The Jose Vilson  José Luis Vilson
Blog by a math educator for a middle school in the Inwood and Washington Heights neighborhoods of New York. Posts, which date back to February, 2007, have included "On The Reason Why You May Only Get One Black Male Teacher Ever In Your Life (If At All),"
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 JustMaths  Seager, Christian; Khawaja, Faisal; Muldowney, Melanie
Video tutorials, practice exam questions, and other intervention resources created by three teachers practicing in the UK Midlands. Free resources include "trumps" and exam questions in algebra, data handling, geometry and measure, number, and more. Blog
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 Just Tell Me the Answer  "Never!"  Matt Owen
Blog by an algebra and physics teacher who believes students "have a real chance at understanding if I'm just willing to let them struggle." Posts, which date back to August, 2012, have included "Answering 'the Question,'" "Flipclass Reflections So Far,"
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 k12.ed.math  Math Forum
A moderated discussion forum for K12 mathematics issues such as curriculum, assessment, classroom practices, suggested assignments, help on particular problems, grading practices, requests for advice, history of mathematics, etc. Messages are reviewed
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 Kagan Publishing and Professional Development
Publications and teacher training to provide children with the situations in which they behave most cooperatively. In addition to greater cooperation, Kagan's "structures" aim for greater academic achievement, improved ethnic relations, enhanced selfesteem,
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 Karismath  Shad Moarif
Learn math through visual scaffolding, whereby "... a math concept is first understood with the help of visualization, then gradually assimilated as an abstract idea in stages of decreasing visualisation and increasing numeracy." More than 10,000 worksheets
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 KenKen @ the Math Forum  Nextoy, LLC and the Math Forum @ Drexel
A collection of KenKen puzzles ranging in size from 3x3 to 9x9, at four difficulty levels, with many combinations of arithmetic operations. The site offers an introduction to KenKen, lesson plans, rules, discussion, and tutorial. KenKen is a number puzzle
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 Kidsmath  About.com
A guided portal to the world of kids' internet math sites. Includes links to math sites categorized by level and topic; math newsletters (which typically highlight a group of sites on one topic, with associated articles); discussion forums; monthly problems
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 Kitchen Table Math  Catherine Johnson
A collaborative weblog that began when Johnson's son "... finished out the school year with a 39 on his Unit 6 test, Fractions and Decimals.... Later on I discovered that fractions are the 'bottleneck' in elementary mathematics; lives are lost in the
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 The Klein Project
Revisiting the intent of Felix Klein's Elementary Mathematics from an Advanced Standpoint on the centenary of its publication, this IMU/ICMIcommissioned project aims to produce a book for upper secondary teachers that communicates the breadth and vitality
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 Knot Theory  ThinkQuest 1997
A short course on knot theory, including tutorials on the basics, knot invariants, knot properties, and knot arithmetic; biographical information on historical and contemporary figures working with knot theory; applications of knot theory; a discussion
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 The komplex plane  Travis Kowalski
Kowalski's problems, animations, tutorials, and other "mathlets" focus on calculus. See also the jokes collected by this professor at South Dakota's School of Mines, and his blog of math musings that wonder at the mathematics in everything from quilts
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 langer.kogut.math
"One year, two math teachers in Boston decided to throw everything out the window and start from first principles. Here's what happened...." Blog posts, which date back to March, 2013, have included "An Illustrative Example  Version Kogs/Whole Child"
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 language and literacy: Mathematics  John Bald
The author of The Literacy File and Using Phonics to Teach Reading and Writing, Bald teaches reading, writing, and foreign languages in the UK. His blog posts, which date back to August, 2008, have included "Language, understanding and confidence in maths,"
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 Lateral Puzzles  Paul Sloane
Pose or solve lateral thinking puzzles, also known as situation puzzles, which depict a counterintuitive scenario to be explained by asking yesno questions or by proposing explanations. Read questionandanswer conversations of current and solved puzzles;
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 Latest posts from Math  Teach For Us
Math teacher blogs from the "network connecting Teach For America (TfA) corps members and alumni who share their stories about ensuring an excellent education for all children." Posts, dating back to July, 2006, have included "what do I need to do to
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 The Laughing Mathematician  Thomas Woolley
Humorous blog begun April, 2011, by a researcher of mathematical biology at the University of Oxford. Posts "that make me laugh or have a mathematical flavour (hopefully, both)" have included "Mathematical biology. Create you own Turing patterns," "Finding
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 Laws of Form  Richard Shoup
Inspired by the book Laws of Form by George SpencerBrown, in which the author built a "calculus of distinctions." Read an interpretation of his laws of calling and crossing as a logical arithmetic; see a simple analysis of SpencerBrown's Counter; learn
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 LearnBop  LearnBop INC.
Oneonone online tutoring for students; infographic progress reports for their teachers and parents. See, in particular, LearnBop's autoscoring playlists of algebra and other math problems, which offer "ask for help" buttons and stepbystep guidance.
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 Learninginhand.com  Tony Vincent
An educator's resource for using handhelds in schools. Includes lists of software applications for Palm and Pocket PC computers, a comprehensive listing of the best sites for educators, lesson plans, classroom management tips, and more.
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 LEARN NC: The North Carolina Teachers' Network  Univ. of North Carolina at Chapel Hill School of Education
A collection of resources designed by experienced North Carolina educators for classroom teaching and learning and for professional development. Resources include: The Beacon, a monthly K12 education journal, and its archives; the complete North Carolina
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 Le Kangourou des Mathémathiques
Ce jeu de mathématiques, créé en 1991 sur le modèle du concours national australien, comporte 24 questions à choix multiple de difficulté croissante, proposées le même jour dans tous les établissements
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 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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 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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 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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 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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