 Fail Early and Often  Andy Pethan
Blog by a Rochester (Minnesota) teacher. Posts, which date back to December, 2013, have included "Mindset on failure," "Moneyballing employee hiring," "Cutting down feedback cycles," "Seeking in the MTBoS," and "TMC folks like to play." Pethan also offers
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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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 Finding Common Ground in K12 Mathematics Education  Mathematical Association of America
"Starting point" documents, designed to advance the discourse about how to improve K12 mathematics teaching and learning, that emerged from MAAconvened pilot meetings between mathematicians and mathematics educators thought to be strongly aligned with
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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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 First Day of School  Math Forum, Teacher2Teacher FAQ
Answers to a frequently asked question: What do you do on the first day of school?
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 First Year Suggestions  Math Forum, Teacher2Teacher FAQ
Answers to a frequently asked question: Can you give me some helpful suggestions for getting through my first year of teaching?
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 Five Twelve Thirteen  Dylan Kane
Blog by an eighth grade math teacher in Boston. Posts, which date back to October, 2012, have included "Assessment & Rigor," "Pythagorean Triples Function," "Construct Viable Arguments and Critique the Reasoning of Others," "Guatemalan Sinkhole," "Problem
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 flippedmath.com  Bean, Spencer; Kelly, Timothy; Brust, Michael; and Sullivan, Corey
These free Algebra, Algebra 2, and Geometry online courses for "flipped" classrooms offer video lessons, practice, application, and mastery check. Teachers for Department of Defense Education Activity (DoDEA) schools, "Algebros" Bean, Kelly, Brust, and
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 Following Learning  Simon Gregg
Blog by a primary teacher at the International School of Toulouse (France). Posts, which date back to October, 2013, have included "playground prime numbers"; "Numbers that reconcile"; "Intuition and slow thinking"; "Popup cuboids"; "The Prisoners' Dilemma";
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 for the love of learning  Joe Bower
"Assessment is not a spreadsheet — it's a conversation." Describing his early teaching practice as "focused on power and control," Bower has followed three principles since 2004: "students should experience their successes and failures not as reward
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 Fostering Math Practices  Lucenta, Amy; Kelemanik, Grace
Providing practical strategies and structures to improve student learning, then building capacity to sustain the work through existing districtbased learning structures, with particular emphasis on leveraging instructional routines to enhance classroom
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 The Four Learning Styles in the DVC Survey  Suzanne Miller, Diablo Valley College
Descriptions of and strategies for four learning styles: visual/verbal, visual/nonverbal, tactile/kinesthetic, and auditory/verbal style. With tips for studying mathematics and a link to the Learning Styles Survey online.
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 freemathtexts.org  Alain Schremmer
Original texts that emphasize a very few but very powerful ideas; appeal to common sense and make no assumption of any kind about the students; and focus on helping readers convince themselves about mathematics. Written for use in developmental mathematics
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 gealgerobophysiculus  Evan Weinberg
Thoughts on teaching, learning, and "the crazy process of having fun doing both with students." Posts, which date back to September, 2011, have included "How China Keeps Me Learning: Part I," "Lens Ray Tracing in Geogebra," "Take Time to Tech – Perspectives
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 Gowers's Weblog  Timothy Gowers
Blog by a Cambridge University professor interested in analysis, combinatorics, arithmetic combinatorics, and "general questions about mathematics, and how it is discovered and transmitted  hence this blog." Posts, which date back to September, 2007
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 Growing Exponentially  Heather Kohn
Blog of "reflections on teaching math and striving to do better each day than the last." Posts, which date back to August, 2012, have included "Olympic Fever," "Work in your head, Points in my head," "Graphing Calculator Activities," "Absolute Value Project,"
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 Guaranteach  Alasdair Trotter and George Tattersfield
Thousands of very short video lessons, recorded by dozens of different professional teachers whose methods and styles of teaching math vary widely. The diverse perspectives and "bitesize" chunks in Guaranteach's video library let viewers stay focused
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 Horizon Research, Inc.
A private research firm located in Chapel Hill, North Carolina, that specializes in work related to science and mathematics education. Recent project include Looking Inside the Classroom, A Study of K12 Mathematics and Science Education in the United
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 HungHsi Wu's Home Page  HungHsi Wu
Articles on the Common Core Mathematics Standards (CCSS) and math education in general, such as "The impact of Common Core Standards on the mathematics education of teachers," "Bringing the Common Core State Mathematics Standards to Life" (published in
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 I Choose Math  Justin Lanier
Blog by a high school teacher in Brooklyn Heights. Posts, which date back to August, 2011, have included "SBG: Affective Quizzing," "FreeChoice Time: Origins," "Introducing Proof Using Formal Systems," and "Math is Personal: A smOOC about Meaning, Sharing,
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 Illuminations  National Council of Teachers of Mathematics (NCTM)
Interactive resources for students and teachers based on NCTM's Principles and Standards for School Mathematics. The site is divided by grade band (PreK2, 35, 68, 912, and a crossband section). Each band contains the following topics: iMath Investigationsinteractive
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 Improving Measurement and Geometry in Elementary Schools (IMAGES)  Research for Better Schools (RBS)
Information and resources designed to help teachers develop a deeper understanding of geometry and measurement concepts and to assist in designing meaningful instruction for elementary students. Topics addressed include: cognitive and developmental issues;
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 Inclusion in Mathematics Education for Students with Disabilities
Presents facilitative strategies for math education for students with disabilities, especially AD/HD and learning disabilities. Most grade levels are appropriate for strategy applications.
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 Infinite Sums  Jonathan Claydon
Blog by a high school math teacher in Houston, Texas, who "decided the corporate engineering world was not for me, so now I joke around with teenagers and teach them math. And soccer." Posts, which date back to June, 2011, have included "Standards Based
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 Infinite Tangents  Ashli Black
This "secondary mathematics education podcast for teachers," begun in March, 2013, invites other high school math teachers to respond to prompts such as "How do you start your teaching day?" and "What would you like to get done in the times between classes?"
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 in pursuit of nerdiness
Blog by a middle grades and high school math teacher, formerly in the South Bronx, currently in the Netherlands teaching both within the Dutch national curriculum (in English) and within the International Baccalaureate Middle Years & Diploma Programs.
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 Inside Mathematics
Classroom examples of innovative math teaching methods, insights into student learning, and instructional tools ready for immediate use. Adopt a schoolwide problemsolving theme with Inside Mathematics' Problems of the Month, each featuring video overviews,
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 The Insight Method of Teaching Math  Robert Frick
How and why to teach math via mental models, as articulated by a cognitive psychologist who describes the "learning is memory" approach as "a disaster and a tragedy." See, in particular, Frick's sample problems: reverse arithmetic, expressing patterns,
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 International Mathematical Virtual Institute  DMBL (Scientific Society of Mathematicians Banja Luka)
The International Mathematical Virtual Institute (IMVI) promotes communication, cooperation and collaboration in the Balkans, elsewhere in Europe, and worldwide on research in (pure and applied) mathematics, history and philosophy of mathematics, and
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 Iron Science Teacher  The Exploratorium
Watch RealPlayer webcasts of scientific and applied mathematical principles, as presented by high school teachers, in the style of the "Iron Chef" cooking show. "Secret" ingredients have included Playdough, fruitcake, pantyhose, eggs, ping pong balls,
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 iSchoolPolymath  Sarah Prendergast
Video libraries, syllabi, Pinterest inspiration pages, and other materials for math courses taught at iSchoolPolymath, a public high school in New York City. Prendergast's Algebra I course incorporates gamification, handson projects, problem solving,
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 Jo Boaler
From the author of What's Math Got to Do with It?: How Parents and Teachers Can Help Children Learn to Love Their Least Favorite Subject. Watch a YouTube clip of Boaler teach using Inquiry Based Learning method, or click through her presentation entitled
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 John Mason's Projects  John Mason
Projects by the author of Thinking Mathematically and former director of the Centre for Mathematics Education: Structured Variation Grids and other animations and applets; studies in algebraic thinking; mathematical explorations; MEMEs (Meaning Enquiry
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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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 Kindergarten Connection  Carol Gossett
A network of educational resources and materials, including teacher tips (both practical and theoretical), lesson plans, and links, from the owner and author of Honey Pot Press. There are three math games in the lesson plan section.
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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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 Launchings  David Bressoud
This monthly column, sponsored by the Mathematical Association of America (MAA), originally aimed "to publicize and expand upon the CUPM Curriculum Guide 2004 and its two companions: the Curriculum Foundations Project, and the CUPM Illustrative Resources."
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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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 The Legacy of R. L. Moore  Educational Advancement Foundation
The Legacy of R.L. Moore Project promotes the study of inquirybased learning (IBL) and teaching methods that Moore propagated while teaching topology at The University of Texas. The "Moore Method" eschews textbooks; calls for only the briefest of lectures
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 Lesson Study Communities Project in Secondary Mathematics  Education Development Center, Inc.
Information and materials from lesson plan study undertaken at Wareham High School (Massachusetts). Teachers studied and reflected on the teaching of algebra and geometry with McDougal Littell, Key Curriculum, and other content and software developers.
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 Lesson Study in Japan  U.S. Science Education  Education Department, Mills College
Research into Japanese "lesson study," a process in which teachers cooperatively develop and critique new lessons. The site focuses on possible applications and challenges of lesson study to U.S. science and math education. Read related articles and
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 MadMath  Daniel R. Collins
Blog by a math lecturer at Kingsborough Community College who believes that "Math is a battle. It is a battle that feels like it must be fought ...," and for whom "math isn't beautiful or fun, but it is powerful, and that's what we need from it." Posts,
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 Making Mathematicians  Holly Young
Lessons, activities, book recommendations, and more from a Nevada educator who provides professional development on the "ACE" method (Answer the question; Cite details, show computation; Explain all steps) of answering constructed response questions.
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 Math by Design: Teaching for Understanding  Purposeful Design Publications
Preview or purchase math textbooks, each of which contains lesson objectives, blackline and drill masters, color transparencies, letters to parents, and "Moments With...," which "integrate math with various subject areas and the Bible."
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 Math by the Mountain
Subtitled "teaching secondary mathematics in the Pacific Northwest," this blog dates back to July, 2016, with posts such as "How I Survived my First Year Teaching Math"; "Trig Ratio Posters for Geometry and Algebra 2"; "Questions on the Logistics of Spiraling
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 MathEd.net  Raymond C. Johnson
Blog begun in October, 2009, by a math education graduate student. Dedicated to "building bridges between research, policy, and practice," Johnson's posts have included "Patterns of Patterns," "RYSK: Erlwanger's Benny's Conception of Rules and Answers
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 Math Ed Podcast  Samuel Otten
"Conversations with math ed researchers": listen to interviews with mathematics education researchers about their recent journal articles and the research studies behind them. Hosted since November, 2012, by Samuel Otten, a professor of mathematics education
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 Mathematically Speaking
"Thoughts and ideas about mathematics in the media, popular views of mathematics, and being a mathematician." This college professor's posts, which date back to April, 2009, have included "Crocheting and Hyperbolic Space," "Topology and the Moore Method
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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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 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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