- Consortium for School Networking (CoSN) - Information Institute of Syracuse
A community of organizations, government agencies, corporations, and individuals in important leadership roles formed to further the development and use of telecommunications in K-12 education. Topics include legislative issues, conference participants
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- Continuous Everywhere but Differentiable Nowhere - Sameer Shah
Blog by a high school math teacher in Brooklyn (NY), beginning shortly before teacher training and orientation, upon realizing that the textbook "completely limits me as a teacher and as a creative person" and who subsequently sets out to "design clear,
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- Crewton Ramone's Blog of Math - Crewton Ramone
Ramone's blog, which dates back to July, 2009, has included posts -- many with video -- such as "Fractions Despite SPED," "Why Invert and Multiply," "4 Year Old Math Enrichment," "Fractions and Addends," "Fractions and Autism Do in Fact Mix," and "Fraction
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- Cryptoclub - Vera Pless, Janet Beissinger
This website includes tools to encrypt and decrypt messages, an
animated treasure hunt, a classroom message board to send and
receive encrypted messages, and a place to explore mathematics
topics related to cryptography, such as prime numbers and
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- Cryptonomicon.Net - Matthew S. Hamrick; PhP-Nuke
A community portal site for amateurs and professionals with an interest in cryptography. The site has some original content and news stories, but the Web links section (with over 1100 links to crypto and security related sites) is most interesting.
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- The CTK Exchange - Interactive Math Miscellany and Puzzles, Alexander Bogomolny
A page devoted to questions and answers concerning Bogomolny's pages and math in general. Postings are approved by Bogomolny, and usually answered by him, although they may be answered by the general public as well. Posting topics vary all the way from
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- CUNY Games Network - CUNY Academic Commons
Blog about the pedagogical uses of both digital and non-digital math games, how they improve student success, and how they encourage research and scholarship in the developing field of games-based learning. Posts, which date back to July, 2011, have included
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- Cyberpapy - Boulanger
Posez votres questions des devoirs dans les forums; des "cyberpapys" répondent.
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- Data Envelopment Analysis (DEA) Homepage - Ali Emrouznejad
A resource site for DEA, an operational research tool for measuring technical efficiency. Includes a brief introduction, glossary, models, bibliography, dissertations, books, people in the field, tutorial, course, data sets, software, discussions, links,
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- The De Morgan Journal - London Mathematical Society
The De Morgan Journal aims "to encourage academic mathematicians to reflect on current issues in mathematics education at all levels, from primary school to graduate studies; to encourage them to explore links between higher mathematics and elementary
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- discretemath - Math Forum
A discussion group for subject matter concerning teaching and researching of discrete mathematics at all levels. It began as a closed list for the researchers and educators who participated in the Rutgers University Discrete Math and Theoretical Computer
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- Discussion Groups: Technology - Texas Instruments
Read, search, and post to groups about TI products: Scientific Calculators, TI-10, TI-73, TI-80/81, TI-82/83/83 Plus/Silver Edition, TI-85/86, TI-89/Voyage 200/TI-92 Plus, CAS and Symbolic Math Guide, Graphing Calculator Comparisons, Derive, muLISP, TI
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- Discussions - Math Forum
The Math Forum's discussions include mathematics and math education-related newsgroups, mailing lists, and Web-based discussions. Read recent and older messages, find out how to subscribe to a mailing list that interests you, read an MAA Online article
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- Disfruta Las Matemáticas - Rod Pierce, mathsisfun.com
Spanish language version of Maths is Fun.
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- Division by Zero - Dave Richeson
A blog about "math, puzzles, teaching, and academic technology." Posts, which date back to September of 2008 and sometimes introduce original applets, have included "Volumes of n-dimensional balls," "Albrecht Dürer's ruler and compass constructions,"
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- Doing Mathematics - Bryan Meyer
Blog by an eleventh grade math teacher at a project-based learning (PBL) school pursuing a Masters Degree in Teacher Leadership. Posts, which date back to February, 2012, have included "What Bowflex Can Teach Us about Assessment," "Habits of a Mathematician,"
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- Domebook - Tom Camilli
Cardboard and transparent plastic geodesic domes built by children. Students start by constructing paper models, then apply scale factors to construct domes of any size using cardboard or wooden dowels and plastic sheeting. See pictures of classroom projects;
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- Drawing on Math - Tina Cardone
Blog by a public high school math teacher in Massachusetts who has participated in Boston University's PROMYS and the Institute of Advanced Studies' PCMI. Posts, which date back to August, 2011, have included "End of Year Reflections: Geometry Favorite
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- dy/dan - Dan Meyer
Meyer has taught high school math since 2004, and blogged about it since September, 2006, with two interests in particular: curriculum design (answering the question, "how we design the ideal learning experience for students?") and teacher education (answering
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- Early Algebra, Early Arithmetic - TERC and Tufts University
The Early Algebra Project examines young learners as they express general relationships among numbers and quantities through written notation, tables, and diagrams. Download PDFs of class materials such as lesson plans and student worksheets; discuss
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- Economic and Game Theory - David K. Levine, Department of Economics, UCLA
A site that uses the tools of modern economic theory and game theory to explore how the interaction of intelligent goal-seeking individuals determines social outcomes. The site offers general interest material, undergraduate and graduate course material,
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- EDeafMath - Dawn Kidd
Vlog for anyone who teaches "at least one deaf or hard of hearing student." Posts, which date back to February, 2013, include "Texas Math Sign Language Dictionary" and "50 Plus Ideas for Using Document Cameras in the Classroom." Kidd teaches middle school
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- educating grace
A blog about mathematical thinking, teaching students to think, thinking about teaching students, and ending educational inequity, especially in math. The posts by this former high school math teacher who now develops teacher training date back to August,
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- Educational Aspirations
"Ramblings from a 21st century educator" who specializes in differentiating math and seeks to make the subject "more engaging and relevant to students' lives." Blog posts, which date back to July, 2011, have included "Measuring Student Growth," "Twitter
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- education.ti.com - Texas Instruments, Inc.
Texas Instruments calculator resources and educational solutions: product information; free program downloads; classroom activities, including both a test prep section and a free, collaborative forum for sharing favorite activities that use TI technology,
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- Edusolution.com - Levi Anthony
Edusolution.com's math center provides New York State Regents Math A, Math B, and Math Courses 1, 2, and 3 exams, with answer keys, dating back to 1999; as well as auto-scoring online math quizzes, a discussion forum for teachers, and New York State standards.
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- Edward Tufte
The work of Tufte and Graphics Press. Read testimonials about his books and purchase them online: The Graphic Display of Quantitative Information, Envisioning Information, and Visual Explanations: Images and Quantities, Evidence and Narrative. In the
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- EdWeb: Exploring Technology and School Reform - Andy Carvin
A hyperbook designed to explore the worlds of educational reform and information technology. Hunt down on-line educational resources around the world, learn about trends in education policy and information infrastructure development, examine success stories
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- Egres Open - Tamás Király
A wiki forum for open problems in combinatorial optimization: colouring, cycles and paths, edge-connectivity, integer polyhedra, matchings, matrices with indeterminates, matroids, node-connectivity, orientations, packing common bases, rigidity, stable
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- Electronics Library, Electronics Community
Thousands of links to R&D documents in electronics. Utilities, general electronics, components, circuits, digital signal processing, measuring, electromagnetics, electric effect, energy, communications, more on the Web. Community and forum.
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- Elementary Math Games and Activities - Math Lessons, Belmont Education
Games, newsletters, articles, and worksheets. Games are for sale, other items free with registration. The authors also post new ideas and receive feedback on the Teaching Math Blog, where past articles and videos have included "30 Tips for teaching Elementary
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- Elements of Abstract and Linear Algebra - Edwin H. Connell; Dept. of Mathematics and Computer Science, Univ. of Miami
A free online textbook in four formats: PDF, DVI, PS, and PSGZ, with six chapters: Background (equivalence relations, injective, surjective, and bijective functions, product of sets, unique prime factorization in the integers); Groups; Rings; Matrices
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- Encouraging Mathematical Thinking, Discourse around a Rich Problem - Math Forum: Bridging Research and Practice Group (BRAP)
This videopaper by the Math Forum's Bridging Research and Practice Group (BRAP) of teacher practitioners and Math Forum Staff opens a conversation around the use of discourse as a basis for encouraging students' mathematical thinking and supporting teachers'
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- Encyclopedia of the Infinite - Johann Christian Lotter
The encyclopedia of infinity consists of concise and sometimes opinionated articles covering all aspects of infinity in science, mathematics, philosophy, and religion.
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- The Endeavour - John D. Cook
Cook's blog posts, which date back to January, 2008, have included "A Ramanujan series for calculating pi," "Limerick primes," "Twin prime conjecture and the Pentium division bug," "Three surprises with the trapezoid rule," "Where to wait for an elevator,"
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- e-Optimization.com
An informational meeting place for anyone interested in optimization software. Conduct an "application search" to find case studies, press articles, and vendors about the use of optimization in industries ranging from aerospace and apparel to sports and
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- e to the i pi - Kevin Bertman
Investigations for teachers to use in mathematics classes. Posts include Phantom Traffic Jams (velocities); Hypotrochoids (Spirographs); Cartograms; Rogue Waves; Fractal Trees; Stereoscopic Images; Six Degrees of Separation; Shoelaces (applying the Pythagorean
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- Euclid Lab
This California-based nonprofit operates Camp Euclid, a mathematics research camp for high school students, as well as a sister program for junior and senior researchers (MRPU). See also Euclid Lab's "math blog written for all," Unsolved:, which discusses
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- The Euler Archive
The Euler Archive is an online resource for Leonhard Euler's original works and modern Euler scholarship. The searchable database provides access to his original publications, references to available translations, and current research. Also available
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- Everything Is Mathematical - RBA Contenidos Editoriales y Audiovisuales S.A.
Based on the series of books, published weekly in association with The Times and presented by Marcus du Sautoy, which aims to demonstrate clearly how mathematics shapes the world around us. Blog posts, which date back to September, 2012, have included
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- Example Problems.com - Todd Smith
This site is an open-community collection of math problems and full solutions for every area of math from Algebra through graduate level partial differential equations, optics, and special functions. The code used on the site's wiki is the same as TeX.
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- Excel Models Blog - Jess
Blog about the use of Excel to analyze real-world problems mathematically. Posts, which date back to October, 2011, have included "Simple Excel Sales Dashboard," "Tutorial Using Concatenate Function In Excel," "Teacher Grade Book," "Buying House To Rent,"
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- Explaining Mathematics - Joel Feinstein
Ideas and praxis by a lecturer at the University of Nottingham (UK). Feinstein's blog posts, which date to December, 2008, have included "How and why we do proofs" and "Problems using LaTeX seminar class with pdflatex" and "Feedback on the use of IT in
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- The Exponential Curve - Dan Greene
A blog by a math teacher at Downtown College Prep charter high school (San Jose, California), where the students "... are primarily Latino, are far below grade level in their math and reading skills, and will be the first in their families to go to college.
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- FamilyEducation Network
Articles, discussion groups, professional advice, suggestions, and other resources for children of preschool and younger, elementary school, middle school, and high school and beyond. Resources topics include activities, health and safety, homework help,
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- Fano Varieties and Extremal Laurent Polynomials - Coates, Tom; Corti, Alessio; Galkin, Sergey; Golyshev, Vasily; Kasprzyk, Al
This research collaboration blogs about the creation of a directory of all possible shapes and geometric building blocks in the universe -- the equivalent of a periodic table of the elements for three-, four-, and five-dimensional shapes. Along the way,
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- Fantastic Fractals - ThinkQuest 1997
All about fractals: including: fully interactive fractal tutorials, a gallery, landscapes, music, a reference desk and types of fractals, downloads, a fractal workshop (build your own fractals), a fractal challenge (test yourself - how much have you learned
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- Fathom and Tinkerplots - Math Forum
A discussion group to foster communication within the Fathom and Tinkerplots user community. Topics appropriate for discussion include how to use Fathom and Tinkerplots effectively in teaching mathematics, statistics, and data analysis; problems (both
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- Finding Ways to Nguyen Students Over - Fawn Nguyen
Nguyen blogs mostly about her teaching middle school math. Posts, which date back to November, 2011, have included "Teaching 101 -- How I Got Like This," "Puzzles and Brainteasers, Set 11," "Pi Day Activities," "Always Sometimes Never," "Using Excel for
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- FlowingData - Nathan Yau
FlowingData explores how designers, statisticians, and computer scientists use data to understand ourselves better -- mainly through data visualization. This blog, by a PhD candidate in statistics with a background in computer science and design, dates
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