 American Institute of Mathematics
The American Institute of Mathematics (AIM) "expands the frontiers of mathematical knowledge through focused research projects, sponsored conferences, and the development of an online mathematics library." See, in particular, the nonprofit organization's
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 The Aperiodical  Steckles, Katie; Perfect, Christian; and Rowlett, Peter
"A meetingplace for people who already know they like maths and would like to know more." Posts, which date back to February, 2008, have included "Podcast: Episode 2  NoelAnn Bradshaw, Newton and Leibniz"; "9 is an experimental error"; "Wolfram Alpha
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 Blog on math blogs  American Mathematical Society
A blog by "two mathematicians touring the mathematical blogosphere." Posts, which date back to April, 2013, have included "Binary Bonsai and Other Mathematical 'Plants,'" "Building the World Digital Mathematical Library," "On Pregnancy and Probability,"
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 Brainly.com.br
"Estudamos em grupo." Faz perguntas; responde para ganhar rankings. Veja, em particular, o arquivo de dever e soluções na area de matemática.
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 Disabilities and Math Anxiety  Math Forum, Teacher2Teacher FAQ
Answers to a frequently asked question: How can I help my child who has a physical or learning disability?
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 Discoveries & Breakthroughs Inside Mathematics  American Mathematical Society (AMS)
Read articles and watch video news segments about the latest discoveries and applications of mathematics: "Do the Math Dance," "Mathematician Calms the Skies with Turbulence Detection Algorithm," "Become a Smarter Shopper," "The Science Behind Movie Magic,"
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 eMentoring Network  American Mathematical Society
A blog "designed to address relevant questions that students, postdoctoral researchers and junior faculty may have regarding their own advancement in mathematics," such as considering graduate school, choosing a graduate program, leveraging research experiences
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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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 Fractured Theorems  Koetz, Matt; Lewis, Heather A.; and McKinzie, Mark
Humorously corrupted theorems, reimagined and redefined: Tschubby chefs theorem, Galoislapalooza theorem, Piano existence theorem, Seinfeld's completeness theorem, BanachStarsky and Hutch theorem, Girdle incompleteness theorem, Fig Newton method,
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 Grad Blog  American Mathematical Society
A "blog for and by math grad students." Posts, which date back to February, 2009, have included "Finding an Advisor," "Navigating Seminars — A First Year's Perspective," "Five Pieces of Advice for the Beginning Teaching Assistant," "Choosing a graduate
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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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 Job Interview  Math Forum, Teacher2Teacher FAQ
Answers to a frequently asked question: What issues should a teacher think about before a job interview?
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 Letters from John Dewey/Letters from Huck Finn  Barry Garelick
Using the name John Dewey, Garelick wrote a set of letters that chronicles his journey through ed school as he pursues a second career as math teacher after retirement. A few years later, he wrote a second set of letters using the name Huck Finn, this
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 Math Day  University of NebraskaLincoln
An annual "day of fastpaced mathematics" for high school students hosted by the University of NebraskaLincoln's Department of Mathematics since 1990. See multiplechoice and essay problems from the individual competition, named PROBE ("Problems Requiring
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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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 Mathematics Dictionary & Glossary for Students  Gary Hadler
Thousands of mathematical terms defined, with crossreferencing and linking.
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 Mathematics  Educreations, Inc.
Mathematics video lessons created and shared by teachers using Educreations' iPad or online whiteboard Flash app, which captures voice and handwriting.
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 Mathigon  Philipp Legner
A collection of educational resources designed to show children, the general public, and teachers "how exciting and entertaining mathematics can be." Interactive eBooks, slideshows, videos, animations, lesson plans include World of Mathematics, Journey
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 Math Moments  David M. Schwartz
Stories and photographs of ways that parents use math with their children at home and on family outings, as blogged by the author of If You Made A Million, G is for Googol: A Math Alphabet Book, Q is for Quark: A Science Alphabet Book, a set of nature
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 Mathovore
Cours de maths et exercices de maths accompagnés (pour membres) de leurs corrigés détaillés.
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 Maths? No Fear!  Matt Skoss
Wiki for sharing practical ideas that engage kids in working as a mathematician, strategies for using Web 2.0 tools, and more. Become a member to access notes and other resources on the structure of maths tasks, problem solving, and more.
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 Maths Questions  Vinny Papay
Answer math questions, or ask your own; register to earn badges or vote. Search posted problems, or browse them by chronology or category.
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 Maths & Science Marketing  Maths and Science Marketing
Producers of software that "enables teachers, schools and learners to move into the 21st century." With sponsorship from the Actuarial Society of South Africa (ASSA), Maths & Science Marketing (MSM) freely provides dozens of maths tests and a dictionary,
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 Math Stack Exchange
A "free, communitydriven Q&A" for people studying math at any level, and professionals in related fields. Post to understand mathematical concepts and theorems, share hints on problems, solve mathematical puzzles, discuss software that mathematicians
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 Maths  Tutorhub  Jon Ellis, Beanbag Learning Ltd
The archive of math questions and responss from this shared Q&A board, where you may get free help from friends or pay as you go for live tutoring over instant messaging.
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 mathtube.org  Pacific Institute for the Mathematical Sciences
Videos and slides of past seminar and lecture materials of the Pacific Institute for the Mathematical Sciences (PIMS). Educational clips include "Math Mania at the Middle School,"; several from Emerging Aboriginal Scholars conferences; "Small Number and
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 The Möbius Project  Maplesoft
Create, share, and grade Maple documents that feature interactive elements such as sliders and buttons.
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 Online Math
Oneonone online tutoring with a former secondary and college math teacher. Skype or email your first math question, answered free; for subsequent problems, negotiate fees, transferrable by PayPal.
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 ProblemAttic  EducAide Software
Thousands of questions from New York State Regents exams, the National Assessment of Educational Progress (NAEP), the Trends in International Mathematics and Science Study (TIMSS), academic competitions, and other test banks. Sign up for a free account
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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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 Scholars Journal of Physics, Mathematics and Statistics  Habibur Rahman
This electronic, open access journal began publishing freely downloadable articles quarterly in June, 2014.
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 Shooloo  Shooloo Inc.
At Shooloo, students "discover the joy of writing their own math stories" by publishing original word problems, constructing viable arguments, critiquing the reasoning of others, and modeling real life with mathematics. Shooloo then presents the resulting
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 The Southwest Center for Arithmetic Geometry  Romyar Sharifi, Principal Investigator
In this intensive fivedaylong school, advanced graduate students work closely with senior faculty and postdoctoral fellows — not as individual researchers presenting their work in relative isolation, but in highly participatory, extended courses
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 Students' difficulties with proof  Annie and John Selden; Mathematical Association of America
Keith Weber overviews research that addresses questions such as "What is proof and what is its role in mathematics?" and "How can the concept of proof be taught effectively?" Difficulties that students have with proofs include inadequate cognitive development,
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 Sybilla Beckmann Kazez
Biography, books, projects, papers, and presentations of the Josiah Meigs Distinguished Teaching Professor of Mathematics at the University of Georgia (UGA). Originally researching arithmetic geometry, Beckmann now considers the mathematical education
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 Teachable Moments International
Nonprofit organization dedicated to inspiring youth to act as "conscious global stewards" through domestic and international academic and cross cultural experiences. Teachable Moments International (TMI) sponsors free math and science workshops for high
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 Visual Insight  American Mathematical Society
A "place to share striking images that help explain advanced topics in mathematics," as edited by John Baez. Twice monthly posts, which date back to August, 2013, have included "Atomic Singular Inner Function," "Catacaustic of a Cardioid {6,3,3}," "Honeycomb
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 Web of Stories
Watch life stories of "people who have influenced and changed our world," such as Nobel laureates and eminent scientists  or record your own stories. Video biographies available through the Web of Stories' flagship channel "Lives" include mathematician
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