 Double Division  Jeff Wilson
Double Division is a method for doing manual division that reinforces the principles of division and gives students success with a less frustrating alternative. The online calculator shows and explains each step. Feedback from teachers who've used the
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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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 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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 Early Algebra Thinking  Bethany RittleJohnson
Evaluating the role of explanation in mathematics learning — specifically, "why" explanations, or reasoning about why something is true. See, in particular, the abstracts, published articles, and coding schemes and other instruments from RittleJohnson's
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 Easing the Hurry Syndrome  Jennifer Wilson
Blog by a teacher in Flowood (Mississippi) whose course load includes Advanced Placement Calculus and Geometry. Posts often begin with alignments to relevant Common Core State Standard (CCSS) and feature screenshots of TINspire CAS Navigators, with original
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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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 Edward Burger
Journal publications, Thinkwell textbooks, and other professional activities of the Francis Christopher Oakley Third Century Professor of Mathematics, formerly Baylor University's Robert Foster Cherry Professor for Great Teaching. Burger, who coauthored
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 Edwards  Clayton Edwards
Problems, lessons, units, and "starters" by a middle grades math teacher who believes in differentiation and "using a mixture of traditional and reform methods to solidify understanding and engage mathematical minds": integer operations, order of operations,
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 Elementary Thoughts: A Collection of Gail's Responses  Gail Englert
A collection of Gail Englert's responses to questions from elementary and middle school teachers, parents, and students, in the Teacher2Teacher service. Covers a wide range of elementary mathematics topics, as well as teaching points.
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 …Except Math Teachers
Blog by a high school math teacher in southern Arizona. Posts, which date back to April, 2013, have included "CCSSM Conference Part 2"; "Baseball Statistics Project Update"; "Systems of Equations Introduction"; "Desmos Polygraph"; "TMC15 Reflections";
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 Exit 10A  Joe Schwartz
"Trying to make math meaningful in an elementary school somewhere off the New Jersey Turnpike." Posts, enlivened by classroom photos, date back to December, 2013: "A Mathematician's Lament," "Building Number Sense," "Fun and Games in Fifth Grade," and
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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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 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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 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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 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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 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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 fractionfanatic  Julie Morgan
Blog by an Australian who has taught high school maths in the Scottish Borders since 2004. Posts, which date back to December, 2015, have included "Learning Intentions and PPPB (Pose Pause Pounce Bounce)," "#MTBoS12days Moment that challenged me," "Quadratics
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 Fraction Help  Math Forum, Teacher2Teacher FAQ
Answers to a frequently asked question: How do I help students learn about fractions?
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 garysmathsblog
One maths teacher's "personal musings" about his experiences, as well as maths resources and teaching tips to help teach maths. Blog posts, which date back to May, 2011, have included "Fraction word problem," "Dyscalculia," "Mean, median and mode rhyme,"
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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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 GeoGebra Wiki  Linda FahlbergStojanovska
On this Wikispaces platform, users can quickly upload GeoGebra worksheets, insert screenshot images using Jing (freeware), and post equations created with Sitmo (freeware). Resources available on the site include: GeoGebra constructions, explorations,
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 Geometry through Art  Norman Shapiro
Lesson ideas, facilitation suggestions, lists of materials needed, and handouts to photocopy. Norman Shapiro focuses on the student as investigator, learning through doing, and using perception to stimulate the motivation for more developed concepts and
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 geometrywiz  Teresa Ryan
Blog subtitled "learning about learning and teaching mathematics." Posts, which date back to November, 2013, have included "Reflecting on Learning Objectives," "Reflections and Inquiry," "What Started as Tough, Becomes Good," "Refresh, Reflect, and Reinvent,"
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 Global Institute of Mathematics  Jim Stone, Global Institute of Mathematics
A traditional high school curriculum of Algebra, Advanced Algebra, PreCalculus and Calculus, delivered online via email and the Web. Sample lessons available.
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 GoodQuestions Project  Dept. of Mathematics, Cornell University
The GoodQuestions project seeks to improve college calculus instruction by adapting two methods developed in physics instruction — ConcepTests and JustinTimeTeaching. GoodQuestions is a pedagogical strategy that aims to raise the visibility of the
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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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 Great Maths Teaching Ideas  Will Emeny
Emeny's blog of teaching ideas and resources, which dates back to June, 2010, has included posts such as "Investigating the sum of interior angles in polygons," "Can you make practising the times tables fun? Yes, just give me three dice," "When angles
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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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 Harry O'Malley
Blog by a math teacher who believes "... that learning to use mathematics changes people's lives in profound and valuable ways," and describes himself as "obsessed with making that happen for people. I am convinced that recent advancements in technology
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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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 How Students Learn: History, Math, and Science in the Classroom  M. Suzanne Donovan and John D. Bransford, National Academies Press
A volume that uses the latest research on cognition, teaching, and learning to address the practical questions that confront every classroom teacher. Leading educators explain in detail how they developed successful curricula and teaching approaches,
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 "I Get It!"  A Guide for the Mathematically Undiscovered  ThinkLinks Press
This fullcolour, K8 series focuses on conceptual language, appropriate models and simplified presentation. Books, manipulatives, blackline masters, and more.
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 I Hope This Old Train Breaks Down...  Mimi Yang
Blog by a high school algebra, precalculus, and calculus teacher in Seattle, by way of teaching positions in New York City, El Salvador, and Germany. Posts, which date back to March, 2009, have included "Math Projects," "The magic of teaching; El Trifinio,"
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 ILoveMath.org  Shelli Temple
ILoveMath.org is a comprehensive site for middle and high school math teachers full of "readytouse" lesson plans, worksheets, activities, and more. The site also features an active message board for math teachers to collaborate.
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 I'm on a Learning Mission  Steve Wyborney
Blog by an elementary math teacher and instructional coach. Posts, which date back to August, 2014, have included "Math Imposters," "Finding Bedrock," "The Hundreds Chart Video Tweet: My Learning Risk," "The Parent's Story of the Child," "Exploring Multiplication
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 The Impact of the Math Forum's Problem(s) of the Week on Students' Mathematical Thinking  K. Ann Renninger, Laura Farra, and Claire FeldmanRiordan
Article in PDF format. Presented at the International Conference of the Learning Sciences 2000.
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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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 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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 Insert Clever Math Pun Here  Meg Craig
Blog chock full of original classroom assignments and handwork samples. Posts by the Birmingham (Alabama) math teacher, which date back to July, 2014, have included "Equation Editor Awesomeness," "#mtboschallenge 123 Sunday Summary," "The Bagel AwardWinning
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 Institute for Learning  University of Pittsburgh
Researchbased curriculum, tools, and professional development designed to build the capacity of teachers, administrators, and systems to provide students with high quality instruction and learning opportunities. See especially What We Know, Principles
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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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 Interventions Portfolio: Math  Peacock, Groenew; School Psychology Project, Univ. of South Dakota, SD
A place to read suggestions by teachers for helping children gain skills and concepts related to mathematics across the grades (Preschool, K2, 35, 68, 912). You may also submit your own successful strategies.
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 Investigating LCM and GCF Using Rods  Margo Lynn Mankus
The objective of the lesson plan Investigating LCM and GCF Using Rods is to look at the Least Common Multiple (LCM) and Greatest Common Factor (GCF) from "handson" patternbuilding to using set theory. With teachers as the intended audience, the activity
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 Investigating Students' Math Reasoning  Heather Johnson
Blog by an associate professor of mathematics education at the University of Colorado Denver who taught high school math in south central Pennsylvania for over a decade. According to Johnson,"two of the hardest things to do when teaching students math
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 Is All About Math  Julio Cesar de la Yncera
Main site for a mathematical Video PodCast that will cover a big range of topics in collegelevel mathematics accessible to the majority of the students with some mathematical inclinations. The Video PodCast will also try to be inspirational for the nonmathematically
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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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 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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 Key Aspects of Knowing and Learning the Concept of Function  Annie and John Selden; Mathematical Association of America
Marilyn Carlson and Michael Oehrtman discuss "what is involved in knowing and learning the function concept," including "the reasoning abilities involved in understanding and using functions and the dynamic conceptualizations needed for understanding
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