 Real World Math  Thomas J. Petra
Lessons that use Google Earth to teach math include Oil Spill Estimates and Scientific Notations; Iditarod Challenge and Typhoon Project; Four Color Map and Mazes & Labyrinths; Crop Circles and Fractal Measurement; Lunar Sports and Rockets. Each lesson
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 Reason and Wonder  Michael Fenton
Blog by a Fresno (California) junior high and high school mathematics teacher. Posts, which date back to March, 2013, have included "Estimation 180 Rocks"; "Quadratics Matching Activity, Take 2"; "Solved the Student Engagement Problem Yet? Me Neither";
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 Rebuilding an Empire  Mike Waechter
Blog by a middle school math teacher in northern California. Posts, which date back to March, 2015, have included "The Good, The Bad and A Moment"; "NBA Desmos Scatter Plots"; and "Barbie Zip Line."
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 The Recovering Traditionalist  Christina Tondevold
Blog by a "former middle school math teacher who learned, and taught, math the traditional way. That was until I realized that many of my students did not learn math the same way I did. So, I embarked on a journey to increase my understanding of mathematics
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 A Recursive Process  Dan Anderson
Anderson's blog, which dates back to June of 2010, has included posts such as "Robocode & Math," "Standards Based Grading," "Cake:Frosting (A look into a proper ratio of real math:cool tech)," "Paper Towels WCYDWT (What Can You Do With This?)," "Two
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 Reflections in the Why  Chris Hunter
Blog by a K–12 numeracy helping teacher in Vancouver. Posts, which date back to September, 2010, have included "Linear Functions — Concretely, Pictorially, Symbolically"; "Math Manipulative of the Month — Base Ten Blocks"; "A Linear Functions
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 Reflections of a High School Math Teacher  Dave Sladkey
Blog by a teacher at Naperville (Illinois) Central High School. Posts, which date back to March, 2008, have included "Thinking Blocks," "School is a Place to Learn from your Mistakes," "More on When Students Teach," "Pop Goes the Weasel and the Quadratic
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 Reflections of a Techie  Marsha Ratzel
Reflections "on using 21st century technologies to amplify learning," as blogged by a selfdescribed nerd who teachers middle grades math. Posts, which date back to July, 2003, have included "Finding the Little Truths of Math"; "Rational numbers need
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 Reflections on Holes in Graphs and Reasoning  Zach Cresswell
Blog by a Michigan teacher of AP Calculus, Precalculus, and Algebra II who has taken graduate courses such as "Creativity in Teaching & Learning." Posts, which date back to May, 2013, have included "Trying a bit of '3 Act Math'"; "Multiple Methods for
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 reflectivemaths  Dave Gale
Blog of "ideas as well as the odd resource" by an Advanced Skills Teacher (AST), SSAT Lead Practitioner and member of the TES Maths panel. Posts, which date back to December, 2010, have included "Mereside yr6 Daily Maths Challenge," "When Mathematicians
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 The Republic of Mathematics  Gary E. Davis
The Republic of Mathematics™ was founded "to promote happy and productive mathematical experiences for all learners, democratize the learning and teaching of mathematics, and help empower students and teachers in their engagement with mathematics."
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 Research Group in Mathematical Inequalities and Applications (RGMIA)  RGMIA and Victoria University, Australia
The Research Group in Mathematical Inequalities and Applications disseminates results via publication (both in print and electronic form) and conferences; creates an awareness of the theory of inequalities and support seminars and visiting academics;
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 Research in Practice  Ben BlumSmith
A "math education research digest" by a former teacher, private tutor, and faculty member of Bard College's Master of Arts in Teaching program who went on to pursue his doctoral degree from the Courant Institute of Mathematical Sciences at New York University.
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 Resourceaholic  Joanne Morgan
Blog of teaching ideas and resources recommended by a Key Stage 5 Coordinator in a Greater London (UK) girls' grammar school. Posts, which date back to April, 2014, have included a recurring series of "math gems" as well as "Highest Common Factor and
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 Right Brained Math  Brandon Price
"Searching for divergence and creativity in all that mathy stuff." Price teaches algebra, geometry, statistics, and robotics at Austin's Khabele School, an International Baccalaureate (IB) World School. His blog, which dates back to March, 2013, has
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 Robert Kaplinsky  Glenrock Consulting  Robert Kaplinsky
Lessons consist of "The Challenge(s)," "Question(s) To Ask," "Consider This," and alignments to Common Core State Standards (CCSS): "How Can We Water All Of The Grass?" and "How Much Money Should Dr. Evil Demand?" and "How Did They Make Ms. PacMan?"
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 The Roots of the Equation  James Cleveland
Blog by a high school algebra teacher in New York City "trying to figure out how it all fits together ... [and] creating interdisciplinary problems, projects, and thinking." A Math for America (MfA) fellow, Cleveland has blogged since June, 2011, with
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 Rubik's Online  Rubik/Seven Towns
The official online site for the Rubik's cube. Play with the cube and other Rubik's games and puzzles online; find information on where to buy Rubik's products; use the forum to exchange views, opinions, comments, suggestions and anecdotes related to
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 Scenes from a Dynamic Math Classroom  Ihor Charischak
In a dynamic math classroom, "discourse between teacher and students produces engagement and learning." Posts, which date back to July, 2008, include ISTE 2011 Reflections  My presentation," "Crowdsourcing Jr. Classroom Activity," "Supermarkets marketing
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 School Restructuring and Block Scheduling  Mabbott, others
Conversations from the Web discussion geometryprecollege. Art Mabbott extends an invitation to teachers who have tried longer class periods to share their results (October 1994). See also Restructuring Time for Math Class, comments, ideas and suggestions
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 Schools Online (SOL)  Pacific Internet Pte. Ltd.
A Singaporebased searchable resource site dedicated to schools, educators, and students, its mission to provide schools with dedicated Internet access and services enabling schools to optimise the Internet for educational purposes. In addition to cocoordinating
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 SchooltoWork (STW)  National STW Learning and Information Center
A system to prepare youth for the high wage, high skill careers of today's and tomorrow's global economy. Using federal seed money, States and their partnerships design the schooltowork system that makes the most sense for them. There is no single model.
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 Science Cheerleaders
Professional cheerleaders pursuing science careers who "playfully challenge stereotypes, turn everyone onto science by encouraging participation in citizen science activities, and inspire young women to consider careers in science, technology, engineering
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 sci.math  Math Forum
A very active unmoderated discussion group focused on general and advanced mathematics. Read and search archived messages; and register to post to the discussions.
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 sci.math.numanalysis  Math Forum
A discussion group for subject matter concerning numerical analysis. Read and search archived messages; and register to post to the discussions.
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 sci.math.research  Math Forum
A moderated discussion group for researchlevel mathematics. Read and search archived messages; and register to post to the discussions.
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 sci.math.symbolic  Math Forum
An unmoderated discussion group for symbolic mathematics packages. Read and search archived messages; and register to post to the discussions. Conversations in this group overlap to some extent with the Matlab and Mathematica discussion groups, but it
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 sci.stat.edu  Math Forum
An unmoderated newsgroup focused on statistics education. Read and search archived messages; and register to post to the discussions. Also available at http://lists.psu.edu/cgibin/wa?SUBED1=edstatl&A=1.
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 Scott Kim, Puzzle Master
A puzzle and graphic design creator, Scott Kim offers links to his online puzzles, a gallery of inversions (or ambigrams, words or names written so they read in more than one waysome read upside down, some flip in a mirror, some read as two different
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 The Secret Garden of Maths  Micky Bullock
Blog by a secondary school maths teacher (Forest School, London, UK) that aims to provide "maths to the masses," with a preference for illustrations via GeoGebra. Bullock describes his "paranoia [as] rooted in the average person's contemptible indifference
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 Secrets of the Fathom Masters  Tim Erickson
"Get your Fathom questions answered here" by a member of Key Curriculum Press' design team that developed the software for data analysis and statistics education. When Erickson needs to write instructions for some procedure using Fathom, he posts them
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 Serendip  Bryn Mawr College
An expanding forum and a continually developing set of resources for exploring and supporting intellectual and social change in education, social organization, and for making sense of life, organized into: Brain and Behavior, Complex Systems, Biology,
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 ShadowFax Cluster Rant  A. Jorge Garcia
Garcia blogs about teaching math and computer science with technology (such as SmartBoards), learning math and computer science with technology, and the LinuxClusters super computer called ShadowFax. Posts, which date back to May, 2009, have included
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 Shock and Vibration Software and Tutorials  Tom Irvine, Vibrationdata.com
Free downloadable Windows software and tutorials with an emphasis on acoustics, shock, vibration, and signal processing. Much of the material is based on Fourier transforms, Laplace transforms, and other mathematical functions. The author also offers
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 ShtetlOptimized  Scott Aaronson
Blog posts include "Teaching your students not to need a teacher," "Ten Signs a Claimed Mathematical Breakthrough is Wrong," "Essentials of complexitytheoretic standup comedy," "My take on the Koblitz affair, "Logicians on safari," and "Unparadox Contest."
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 Simply Statistics  Leek, Jeff; Peng, Roger; and Irizarry, Rafa
Biostatistics professors Leek, Peng, and Irizarry "are fired up about the new era where data are abundant and statisticians are scientists." Their blog, which dates back to September, 2011, has included posts such as "Precog and stats," "Kindle Fire
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 Sine of the Times: Dividing the Universe by Zero  Colin Graham
A collection of thoughts on math by an "eternal student" with an "eclectic educational background." Posts, which date back to June, 2010, have included "Creative ways of integrating more water in the body," "My first online manipulative  virtual origami,"
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 SingaporeMath.com Inc.
Formerly "Family Things," this family business located in Oregon, USA provides information, sample pages, and ordering information for the Singapore mathematics and science curricula, with sample placement tests for the New Elementary Math Series, sample
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 singingbanana.com  James Grime
YouTube videos, "lazy microblog," and social networking hub of Enigma Project Officer James Grime, who "hopes to explain to kids and general audiences why he love his maths so much, to challenge some of the public's misconceptions, and to explain why
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 Sketch Exchange  Key Curriculum Press
Share Sketchpad activities, tips, questions, and ideas in this online community dedicated to the dynamic geometry software. Browse sketches by grade level, topic, or tags.
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 SketchUp  Robert Lang
Tutorials, tips, tricks, and more about the 3D modeling software. Lang, a professional woodworker, cabinetmaker and designer who serves Popular Woodworking Magazine as its Executive Editor, uses SketchUp to design woodworking projects, and as the basis
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 Skillswise  BBC Online
Factsheets, worksheets, quizzes, and Flash games on whole numbers; measures, shape and space; fractions, decimals and percentages; and handling data. Resources for tutors include lesson plans, printable tracking sheets, a newsletter, and an expert column
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 snark (Spanish Math Puzzles)  Universidad de Buenos Aires, Math Forum
Contributions are only in Spanish. Una lista de correo electrónico dedicada a la matemática recreativa, los problemas de lógica recreativa, juegos de tablero y problemas sobre ellos, rompecabezas geométricos (poliominós,
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 Social Actuary  Social Actuary
The Social Actuary community allows actuaries to: create a user profile; connect with other actuaries around the world to discuss exams, study habits, careers and much more via the Forums; display exam and destination progress via user profile; create
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 Society of Young Mathematicians  SYMs
A UK organization that motivates and encourages "all young people who enjoy mathematics." SYMS publishes articles, news, "things to do," calculator hints, book reviews, games, puzzles, and competitions in its newsletter, SymmetryPlus, and termly journal,
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 Solve My Maths
Blog of "puzzling questions that purposefully minimalise the amount of information explicitly given," written by a teacher for whose students "finding the answer isn't even the goal — it's trying to see if there's a way through." Posts of brain
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 Sometimes We Learn Some Math Too  Jacqueline Sheppet
Blog by a high school teacher in British Columbia. Posts, which date back to September, 2014, have included "Purple is the new math," "Forming a formative mindset," "A formula to understand," and "Do the ends justify the means?"
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 sonata mathematique  Rachel Kernodle
Blog by a high school math and learning specialist. Posts, which date back to June, 2011, have included "twitter math camp," "mathematical art," "i also want you to learn…," and "rational functions take two."
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 The Space Between the Numbers  Breedeen Murray
Blog by a math teacher and writer "about how these two aspects are inextricably linked together in my own person, and maybe in yours, too." Posts, which date back to June, 2010, have included "PinkSlip to Private School," "SBG, Hold the G," "A Different
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 Sproglit  Sproglit LLC
Creators of "Kyle Counts" and other resources based on the Math Arrow, a zigzag arrangement that uses shape and color to reveal properties of the natural numbers 1100. Blog posts, which date back to February, 2013, have included "What We Learn from
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