 Mathematical Sciences Digital Library (MathDL)  Mathematical Association of America (MAA)
The MAA's Pathway project within the National Science Digital Library, this site combines the earlier MathDL and Math Gateway sites. The online publication Loci continues the tradition of the three earlier online publications (JOMA, DCR, and Convergence).
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 The Mathematical Tourist  Ivars Peterson
"Cool stuff" that Peterson, the Director of Publications and Communications at the Mathematical Association of America (MAA), encounters while "browsing the world of mathematics and computer science: new developments in math and its applications, old
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 Mathematicians in Math Education  Mathematics Education at the Math Forum
A page designed to document and encourage productive involvement of mathematicians in K12 education, from Susan Addington and Judy Roitman. How to join discussions and get involved, with relevant readings.
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 A Mathematician's Musings  Ethan Weker
Blog by a Menlo Park (CA) teacher of algebra, geometry, trigonometry, and precalculus. Posts, which date back to September, 2014, have included "When We Make Math Look Too Easy"; "Math as a Historically Collaborative Effort"; "When Plans Go Awry"; "Brainstorming
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 The Mathematician's Shirt  Collins, Julia; and Shepherd, Madeleine
A collaboration between mathematician Julia Collins and artist Madeleine Shepherd to "design and create a series of sculptures made out of shirts and representing different concepts in mathematics." With funding by the Art Science Collaborative (ASCUS),
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 Mathematics
This blog of instructional posts, which dates back to January, 2011, has included articles that introduce concepts of scale factor, logarithms, calculus, surds, and more.
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 Mathematics and Multimedia  Guillermo Bautista
Blog about mathematics, teaching, learning, and technology. Begun in October, 2009, it has included posts such as "GeoGebra Tutorial 4  Graphs and Sliders"; "Screencasting Tutorial: Making a Math Video Lesson Using Camstudio"; "Derivative in Real Life
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 Mathematics  Answerway.org
Read question boards and discussion forums on a range of math topics. Join to post questions and answers. Answerway is an online information and communications service that allows volunteers with specific expertise to answer questions posted by people
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 Mathematics by Mr. P  Mike Poliquin
Middle school math teacher Poliquin began this blog, subtitled "making sure everyone gets it," in December, 2011. Posts have included various original problems of the week; "Eudoxus of Cnidus: the First Mathematical Superstar"; "A Quick Dip in the Deep
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 Mathematics Concept Inventories
A Facebook group for the Basic Skills Diagnostic Test (BSDT) and Calculus Concept Inventory (CCI). Both developed by Jerry Epstein to assesses conceptual understanding, the BSDT tests learners from elementary school through precalculus; the CCI, for
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 Mathematics Education in China Discussions  Math Forum
A discussion group dedicated to questions raised by Dianzhou Zhang, Professor of Mathematics, East China Normal University, Shanghai, who cochairs a commmittee charged with redesigning high school mathematics education in all of China. Read and browse
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 Mathematics Educators Stack Exchange
A "free, communitydriven Q&A" for those who teach mathematics. Post, answer, and vote up or down questions such as "Advantages on repeating question in student's answer," "How can we help students who are very anxious about math?" and "Should I design
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 Mathematics for Teaching  Erlina Ronda
Ronda, who teaches math and trains teachers, blogs to "narrow the gap between mathematics education research and practice in mathematics teaching and learning." The Mathematics for Teaching (M4T) blog, begun September, 2009, offers teaching tips based
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 Mathematics, Learning and Web 2.0  Colleen Young
Blog by a teacher and trainer in mathematics and information technology (IT) with "a keen interest in how new technologies can deepen the learning experience for students." Posts, which date back to January, 2009, have included "Manga High," "Graphing
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 Mathematics Learning Forums  Education Development Center, Inc. (EDC)
The Mathematics Learning Forums offer teachers the opportunity to do mathematics with their students and talk about mathematics with their colleagues through online seminars. The forums are designed to help teachers introduce new mathematics teaching
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 Mathematics Tutorials and Help  Sophia Learning, LLC
Math packets, playlists, peoples' profiles, questions, and answers from this social teaching and learning platform, akin to "a mash up of Wikipedia, YouTube, and Facebook" for teachers and learners.
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 Mathematik für die Schule  Kevin Görner
German language explanations for high school mathematics: basics, relations, derivatives, symmetry, and functions.
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 MatheMazier  Oluwasanya Awe
Blog about "problem solving, updates on some Olympiads, and also about Africa." Posts, which date back to October, 2012, have included "IMO 2011 Problem 2 (The Windmill Problem)," "Number of Zeros 1000! Ends With," "The Nigerian PanAfrican Maths Olympiad
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 matheminutes  Owen Elton
Blog of "important aspects of mathematics in bitesize chunks" by a maths teacher in Surrey, England. Posts, which date back to August, 2011, have included "Competitive Colouring"; "The Geometry of Sushi"; "Mathematicians on Money"; "Nontrivial Trivial
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 Math Exercises
Interactive exercises, lessons, and worksheets to practice knowledge of whole numbers, integers, divisibility, fractions, exponents and powers, percentages, proportional reasoning, linear equations, quadratic equations, monomials, polynomials, special
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 Math for America
An organization with the mission of improving math education in our nation's public schools. Download PDFs from MfA's Lesson Plan Database according to math subject, topic, technology, duration, level, and activity structure, which includes the categories
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 Math for Grownups  Laura Laing
From the author of the book by the same title. Laing, a "selfproclaimed math evangelist," has blogged since May, 2011: "Math Secret #1: There’s More Than One Way to Skin a Math Problem," "Math at Work Monday: Kim the Copywriter," "Math at Work Monday:
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 Math for Morons Like Us  ThinkQuest 1998
Students talk to students about math: a site designed to help you understand math concepts better. Tutorials, sample problems, and quizzes for PreAlgebra, Algebra, Geometry, Algebra II, and PreCalc/Calculus, designed assuming you know some of the basic
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 Math foru' : les maths ont leur forum !  Thierry Planterose
In French: Forum de mathématiques destiné aux collégiens, lycéens, étudiants.
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 Math forum
A math questionandanswer discussion forum.
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 MathFour  Bon Crowder
Articles, interviews of fellow mathematician parents, narrated videos of paperandpen math techniques, and other resources for homeschooling and afterschooling parents. Crowder, an instructional strategist by day, seeks to get parents to feel "comfortable
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 MathGifs
"Illuminating mathematics through animations." This blog, which dates back to September, 2013, has included illustrated posts such as "Reflective Property of the Ellipse," "Rotations Through Translations," "Fourier Pumpkins," "Sonic Booms," and "The Mandelbrot
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 MathGroup, the Email Group for Mathematica Users  Steven M. Christensen and Associates, Inc.
MathGroup is a moderated electronic mail list for Mathematica users. Many of the leading experts on Mathematica inside and outside of Wolfram Research read and respond to user comments and problems. The site includes Mathematica Benchmark Sites, Mathematica
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 Math Help Forum
Help with homework, projects, games, and more. Register to participate in six online discussions: Elementary and Middle School Math Help; High School Level Math; College Level Math; Math Lounge, for conversations on topics such as brain teasers and more
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 mathhistorylist  MAA, Math Forum
An unmoderated group hosted by the Mathematical Association of America (MAA) and dealing with the history of mathematics, including announcements of meetings, new books and articles; discussion of the teaching of the history of math; and questions that
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 math hombre  John Golden
Golden, a math professor at Grand Valley State University (Michigan), blogs to "share my math interests on the web, post new materials for elementary, secondary and teacher ed, and vent mathematical steam when needed." Posts, which date back to April,
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 Mathie x Pensive  Gregory Taylor
Musings on mathematics, teaching, and more by an Ottawa (Canada) high school math teacher who majored in computer science and graduated from the mathematics program at the University of Waterloo before receiving his B. Ed from Queen's University. Posts,
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 Math Images  The Math Forum @ Drexel, the National Sciences Digital Library (NSDL), and Swarthmore College
The Math Images Project aims to
introduce the public to mathematics through beautiful and
intriguing images found throughout the fields of math. The
images feature resources around the mathematics of the images,
including discussions, applets, and
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 Math in Unexpected Spaces  Malke Rosenfeld
Blog borne of a presentation that "harnessed the math of making and making comparisons to explore congruence, symmetry, transformations, categorical variables, group theory, and spatially complex physical/temporal patterns." Posts by the author of Math
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 Math Is Everywhere!  Franklin Northwest Supervisory Union
Problems of the day, reflections on workshops, and other blog posts. This partnership of the Franklin Northwest Supervisory Union and the Vermont Math Initiative aims to obtain community support for STEM and expose students to STEM careers.
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 Math is More  Garfunkel, Sol; Mumford, David
Continuation of the conversation begun when The New York Times published the authors' oped article "How To Fix Our Math Education" in August 2011. Read the ten planks of the platform "toward a national consensus on improving U.S. mathematics education";
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 The Math Lab @ Room 27  Matt Jones
Subtitled "It doesn't HAVE to be boring ...," this blog dates back to March, 2014. Posts have included "March Math Madness, New Additions to the Room, and Another Quote"; "Common Core Backlash"; "The Best Laid Plans..., 'Real World' Math, and 3rd Grade
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 The Math Less Traveled  Brent Yorgey
A blog "dedicated to exploring beautiful mathematics." Posts, which date back to March, 2006, have included "Proof by animation," "The Nuclear Pennies Game," "Recounting the Rationals," "Predicting Pi," "Square roots with pencil and paper," "Irrationality
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 mathletics  Wayne Winston
From the author of the book by the same title, which reveals "how professional baseball, football and basketball teams use math to improve their performance" à la Moneyball, and also discusses lineup evaluations, the effectiveness of running and
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 MathLinks Math Forum  Valentin Vornicu
An online math olympiad community, organized into levels  from middle school to "College Playground"  and national and local communities. Discuss thousands of problems on the bulletin boards, or post your own with HTML and LaTeX.
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 Math = Love  Sarah Hagan
Blog by an algebra teacher in Oklahoma "inspired to become a math teacher by a math teacher blog I happened upon in high school." Planning her lessons with foldables and graphic organizers in mind, Hagan describes herself as "obsessed with making math
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 Math Mama Writes...  Sue VanHattum
The blog of a community college math teacher and "mama of a young son" interested in all levels of math learning  but VanHattum "may throw in posts on parenting, kids' books, living simply, peace & justice, ..." Blog entries date back to March,
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 Math Message Board  David Manura
A searchable Webbased discussion area for questions, answers, and talk on any math topic that allows for input of mathematical notation, diagrams, and HTML into message postings. Subject areas include General Questions; Elementary Math; Algebra/Geometry/Trig;
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 Math Minds  Kristin Gray
Blog by a K5 Math Specialist in Lewes, Delaware. Posts, which date back to April, 2013, have included "Embracing Disequilibrium," "Marilyn Burns  NCSM Presentation," "NCSM  Jo Boaler  Promoting Equity Through Teaching for a Growth Mindset," "Connecting
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 Math Misery?  Manan Shah
Blog that "aims to convey the general feeling that the majority of people have when it comes to working with mathematics... and bring awareness about what mathematics is and what mathematicians do." Posts, which date back to May, 2013, have included "Figuring
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 Math Mistakes  Michael Pershan, editor
Compilation, analysis, and discussion of the mathematical errors that students make. Pershan, who teaches high school math in New York City, has posted a new error on this blog every day since June, 2012.
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 MathML Information Center  Geometry Technologies, Inc.
A comprehensive source for information on the Mathematical Markup Language, or MathML. Includes a MathML Resource List (available and developing MathML software; documentation and related informationincludes a gentle introduction to MathML); MathML
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 Math Movement  Tim Chartier
Blog that focuses on mathematics and the "progress or movement" that occurs in Chartier's teaching, research, writing, and performing. An Associate Professor of Mathematics at Davidson College, Chartier has trained at Le Centre du Silence mime school
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 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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