 Academic Torrents  Cohen, Joseph; and Henry Lo, Henry
This distributed data repository made for researchers, by researchers, uses bittorrent technology to facilitate the storage and sharing of research data — from NASA's map of Mars, to bags of words, to NOAA weather data. Browse datasets, papers,
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 Academy123
From the creators of NutshellMath Homework Help. Prerecorded minilectures and ondemand homework help. Choose a major math textbook for tailored Flash chalkboard demonstrations that feature color ink strokes accompanied by a teacher's voice. Covered
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 The Academy of Inquiry Based Learning
A "big tent" community of instructors, teachers, and supporters of inquirybased learning (IBL), the Academy of Inquiry Based Learning (AIBL) supports the education of students "deeply engaged in rich mathematical tasks who have ample opportunities to
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 The Academy of Natural Sciences
Founded in 1812, The Academy of Natural Sciences of Philadelphia is the oldest science research institution in the Western Hemisphere and a world leader in the fields of natural science research, education and exhibition. This site contains online exhibits,
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 Access and Equity in Mathematics Education  EXTEND  Perspectives in Mathematics Education
Links to information about providing access to higher mathematics for all students amidst continuing public debate about the wisdom of tracking and the role of federal, state, and local policy in enabling reform. Equity and Access in Mathematics Education;
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 Accountable Talk^{SM}  Lauren B. Resnick and Megan Williams Hall with the Fellows of the Institute for Learning
Excerpt from an "ebook" introducing the Principles of Learning. Includes audio clips and video examples with transcripts and suggested discussion questions.
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 Accurate Census Taking and Orderly Ants (Math Chat)  Frank Morgan; Christian Science Monitor
A column of ants marches in single file, until one ant falls away and they then march two by two, until another ant falls away and they then march three by three, and so on until finally they are marching 10 by 10. How many ants were there to start with?
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 Acertijolandia  Jose Manuel Galvan Pachon
Math problems, riddles, and brain teasers for all ages. In Spanish.
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 Achievement Technologies
Educational software for learning math at all levels  primary education; GED; community college; adult basic education; correctional, vocational, and special education; mainstream instruction; or home schooling. K12 lessons are aligned to the NCTM Standards.
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 achieve.org  Achieve, Inc.
A site for information on state progress in raising expectations for all students, with a searchable database of the academic standards from most states in math, English, science, and history/social studies and sample assessment questions, student work,
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 achievethecore.org  Student Achievement Partners
Professional development modules, voices of teachers, articles, tools, research, and other free resources for educators implementing the Common Core State Standards, as assembled by the American Federation of Teachers (AFT), the National Education Association
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 Acid Library  The .Net Math Parser  Blue Analysis
A high performance math parser. Features include basic mathematics, brackets, advanced functions and constants. The Acid Library is a software component delivered ready to use with the .Net Framework 2.0. It will run natively, without any performance
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 Acid Rain Simulation (MSTE)  Louie Beuschlein; University of Illinois at UrbanaChampaign (UIUC)
A twoday unitthat uses decisionmaking ideas from statistics in the science classroom. No previous experience with statistical analysis is necessary. Students make use of sampling to back up a claim, and design (with teacher assistance) a statistical
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 A+ Click K12 Math Quiz
A+ Click is a free online math quiz. Assess your math skills from grade 1 to grade 12; you may move up a level if you give 5 correct answers in a row. Also available in Russian.
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 ACME Klein Bottles  Cliff Stoll
"Searching for a onesided surface? Need a zerovolume bottle? Want the ultimate in nonorientability? Get an ACME Klein bottle!" Available in several different models, including classical, Erlenmeyer flask, sliced, spiral, "weirdies," and special designs.
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 ACMEScience  Samuel Hansen
Lighthearted mathematical podcast series Combinations and Permutations, Strongly Connected Components, and more.
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 The ACM Journal of Experimental Algorithmics (JEA)  Association for Computing Machinery
An online journal devoted to experimental work in the design and analysis of algorithms and data structures, with two principal aims: to stimulate research in algorithms based upon implementation and experimentation; in particular, to encourage testing,
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 ACM Transactions On Mathematical Software (TOMS)
The purpose of the Association for Computing Machinery Transactions on Mathematical Software (TOMS) is to communicate important research results concerning the development, evaluation and use of mathematical computer programs. In addition, TOMS publishes
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 A+ Compass  Art Stoner, Ed.D.
A compass for use on whiteboards, with radius to 14+ inches. Uses a variety of markers and is safe for all surfaces. Easy to use and accurate.
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 Acquisition of Arithmetic (Learning and Mathematics)  H. Ginsburg; Math Forum
In a chapter entitled "Learning to Count. Computing with Written Numbers. Mistakes" in the 1977 book, Children's Arithmetic: How They Learn It and How You Teach It, Ginsburg draws heavily on the idea of assimilation  the incorporation of new ideas into
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 Activating EnergyNet (Handbook of Engaged Learning Projects)  Bonnie Kuhrt; Carl Sandburg Junior High School, Rolling Meadows, IL
Junior high students design resources for other students involved in the EnergyNet data collection and interventions project and create Web pages for a district energy program. Site contains a summary, scenario, student pages, and useful Internet links,
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 Active Algebra  David Womersley, Active Maths Limited
Interactive resources designed to enhance and enrich the teaching and learning of algebra. Free trial version available online; buy the CD and get a password which will remove the evaluation logo from those versions. All the activities can be used either
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 Active Elementary Number Theory: n^{2} + 1 and coprime increasing pairs of different parity  H. B. Meyer
An interactive study of coprime increasing numberpairs of different parity and their relations to divisors of n2 + 1. Requires JavaScript.
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 ActiveMath Workshops  Northbrook, IL
ActiveMath provides personalized, handson teacher workshops for teachers of grades K12. The workshops specialize in teaching mathematics for understanding, while making strong connections to other disciplines and to the real world. Graduate credit
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 ActivePrompt  David Wees
"A different framework for gathering information about what your class understands": upload an image, key in a prompt (e.g., "Where does circle number 5 go?"), and ActivePrompt combines them into an interactive poll to canvas your students. By aggregating
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 Active Worksheets  David Womersley, Active Maths Limited
Formerly known as the Worksheet Factory, you can create worksheets online for an annual subscription fee: click on the "change" button and watch the numbers, angles, shapes or equations change; click on the "print" button to print a pupil worksheet and
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 Activities for Kids  Apollo Web Stars
Lesson plans and printable activities can be found under Teacher Help: printouts are available for math worksheets (number chart, addition chart, timed worksheets) and for multiplication tables. You may also search for activities locally by state and
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 Activities for Learning (AL) Mathematics Program  Joan Cotter
The RightStart Mathematics program covers grades K4 with a transition program for converting to RightStart. Teacher's manuals include daily lessons and worksheet blackline masters. A comprehensive program for homeschoolers, grades K4, is based on the
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 Activities & Information Supporting Pi Day Celebration  Carolyn M. Morehouse
Lesson plan, songs, trivia quiz, and refreshments signup sheet for a Pi Day celebration. Hosted by the Math Forum's Teacher Exchange.
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 Activity Group on Discrete Mathematics  Society for Industrial and Applied Mathematics (SIAM)
The SIAG on Discrete Mathematics focuses on combinatorics, graph theory, cryptography, discrete optimization, mathematical programming, coding theory, information theory, game theory, and theoretical computer science, including algorithms, complexity,
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 Activity Resources  Activity Resources Inc.
Created by Mary Laycock for mathematics teachers, with the goal of providing a real understanding of mathematics through handson (manipulative) activities. Purchase books and manipulatives on arithmetic, base ten, red and blue blocks, Cuisenaire rods,
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 ACTM '97: Second Asian Technology Conference in Mathematics  S. Chu, Radford University
Computer Technology in Mathematical Research and Teaching. ATCM97 provided an interdisciplinary forum where researchers and teachers in the fields of mathematics, education, computers, and technology presented results and exchanged ideas and information.
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 Actuarial Outpost  Glenn Cooke
Actuarial website with discussion forum, free study material, and job postings. Also available at http://www.actuarialoutpost.com/.
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 Actuarial Studies Program  Mathematics Department, The University of Texas at Austin
Detailed information on the undergraduate and graduate programs in Actuarial
Studies (actuarial science) at The University of Texas at Austin.
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 Actuary.com
Actuarial science information including topics such as: actuarial exams, employment, job postings, discussion forums, directory of actuarial schools, directory of actuarial recruiters, actuarial company information.
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 Adam Up  Summerfield, James; Kordan, Samuel
Original music, chants, and other oral mnemonics that tell the adventures of Adam Up, who hated maths "... until the day his grandfather gave him a special calculator to summon The Number Crunchers. These strange bearded creatures then sing him catchy
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 The Ada Project (TAP)  Carol Frieze and Women@SCS; Carnegie Mellon University
Tapping Internet Resources for Women in Computer Science, this site serves as a clearinghouse for information and resources relating to women in computing: conferences, projects, discussion groups and organizations, fellowships and grants, notable women
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 AdaptedMind  Kumar Kota
AdaptedMind uses adaptive technologies closely tied with videos, explanations, and prizes to help K6 students practice math more effectively. Free worksheets, custom exercises, and skills pretest.
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 Adapting Science to Chaos  Chris Lang
A new mathematics and metaphysics specifically designed for chaos, complexity theory, and chaotic and complex dynamical systems. The Heisenburg uncertainty principle limits experimentation: optimizing science for chaotic and complex dynamical systems
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 Adaptive Precision FloatingPoint Arithmetic and Fast Robust Predicates for Computational Geometry  Jonathan Richard Shewchuk; University of California at Berkeley
C code for orientation and incircle tests using adaptiveprecision floatingpoint arithmetic. Papers, software, inspiration.
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 Adaptive Technology Resource Centre  University of Toronto
A services and a research and development centre that focuses both on solutions for persons with disabilities, and on universal design. The site includes the Vision Technology Service (sight enhancement and substitution clinic), a technical glossary (covering
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 Addathon™  Jari Pihlajamaki
Math and strategy game for the iPad: as you clear rows in this Tetrislike challenge, choose your special talent, build up your powers, and collect pickups. Different skill levels and modes (timed, puzzle, and "Marathon Unlimited") available.
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 Adding Feet and Inches  NASA Lewis Learning Technologies Project
If Sally places a 3 feet 6 inch tall rocket atop a 1 foot 8 inch tall launch pad, how tall will the entire unit (rocket and launch pad) be when she is done? A detailed answer is provided. From NASA's 9th Grade Math Proficiency Test.
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 Adding Integers (SMILE)  John Charles Thomas, N. F. Simeon Vocational High School
A lesson designed to teach students to add and subtract integers, and define terms (additive inverse, identity element of addition, associative property of addition, addend, sum, magnitude). From the Arithmetic section of a collection of almost 200 single
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 Adding Mixed Numbers with Unlike Denominators (SMILE)  Camille Gales, Edward Coles Elementary School
A 7th grade lesson designed to provide students with practice in adding mixed fractions with unlike denominators. From the Arithmetic section of a collection of almost 200 single concept lessons by the Science and Mathematics Initiative for Learning Enhancement.
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 Adding/Subtracting Fractions  Math Forum, Ask Dr. Math Common Question
A selection of answers to questions about adding and subtracting fractions, including how to find common denominators.
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 AddisonWesley Higher Education  Pearson Education
Publisher of programs and materials for primary and secondary school students and teachers; higher education textbooks and multimedia in major academic subjects for students and professors; books and multimedia for business professionals, practicing engineers,
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 Addison Wesley  Mathematics  Addison Wesley Longman (AWL)
Addison Wesley Longman (AWL) publishes products with a focus on math fundamentals and creates solutions to teaching and learning challenges through text, supplements, software, CDROMs, videos, and the WWW. Products are available for all segments of
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 Addition and Multiplication Tables in Various Bases  Interactive Mathematics Miscellany and Puzzles, Alexander Bogomolny
An applet that combines addition and multiplication tables for bases from 2 through 36. In every base N, there are N digits. In the decimal system, for example, we have 10 of them: 0,1,2,3,4,5,6,7,8,9. In base 7, there are seven digits: 0,1,2,3,4,5,6.
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 Addition and Subtraction of Signed Numbers (SMILE)  David Drymiller, Morgan Park High School
A lesson designed to help students master the addition and subtraction of signed numbers, and learn to recognize linear equations of the form x + a = b and their solutions. From the Arithmetic section of a collection of almost 200 single concept lessons
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