 Academic Systems
Produces multimedia instruction software for mathematics and English. Interactive Mathematics includes integrated animation, graphics, audio, and video; individualized student programs; an array of help and support options; and an online reporting system
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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 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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 ACalculator.com
Hundreds of online financial and unit conversion calculators available for installation on your own website, where your customers can carry out calculations on their own, with transparency.
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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 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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 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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 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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 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 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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 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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 Adaptech Research Network  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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 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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 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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 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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 The Addventures of Plusman  Michael Cherry
Math puns, wordplay and illustrated concepts, all in a comic book format. The first of the Plusman series introduces Adam Tegetter, Aidee DeGrangle, Hex A. Hedron, the evil Dr. Nein and the origin of Plusman and the Permutation; the second tells of the
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 Adult Literacy and Lifeskills (ALL) Survey  National Center for Education Statistics (NCES), U.S. Department of Education
The Adult Literacy and Lifeskills (ALL) Survey is an international comparative study designed to provide participating countries, including the United States, with information about the skills of their adult populations. ALL measured the literacy and
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 Adult Numeracy
A collection of resources on adult numeracy, from a group devoted to statistical literacy. Key websites, conferences, publications, organizations, and surveys.
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 Adult Numeracy Core Curriculum  The Basic Skills Agency, via Count On
The U.K. adult literacy and numeracy core curriculum in PDF format. "It sets out the entitlement to learning for all adults who have difficulties with literacy and numeracy. It describes the content of what should be taught in literacy and numeracy programmes
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 Adult Numeracy Network (ANN)
A community dedicated to highquality mathematics instruction at the adult level. ANN conducts preconferences at the annual NCTM national meetings; publishes the Math Practitioner Newsletter; sponsors the
Numeracy List, an adult electronic forum; and
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 Adult Numeracy @ TERC  TERC
Information about and materials from TERC's adult numeracy projects, including EMPower (Extending Mathematical Power), TIAN (Teachers Investigating Adult Numeracy), and Statistics for Action. The published EMPower curriculum fills the need for a math
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 Adults Learning Mathematics (ALM)
An international research forum bringing together researchers and practitioners in adult mathematics/numeracy teaching and learning in order to promote the learning of mathematics by adults. Biannual listing for researchers, practitioners in adult mathematics/numeracy
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 Advanced Algebra Through Data Exploration: A Graphing Calculator Approach  Key Curriculum Press
An allnew text that combines data exploration, handson activities, and the power of graphing calculators to enhance the content of advanced algebra.
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 Advanced CSS Rendering: Embedding Mathematical Content in HTML  George Chavchanidze
Discussion of a crossbrowser method of rendering mathematical content using HTML and cascading style sheets (CSS). A set of CSS style sheets for online scientific publishing is available.
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 Advanced Data Visualization  Principia Mathematica
PMVisualization Studio is a Microsoft Windows 95, 98 or NT application that takes the Visualization Toolkit (Vtk) data visualization architecture and extends it by providing a graphical pipeline editor. It also includes an Active X control that allows
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 Advanced Grapher  Serpik Soft
Graphing, curve fitting and calculating software. Graphs Cartesian (Y(x) and X(y)), polar and parametric functions, graphs of tables, equations (implicit functions), inequalities and systems of inequalities and slope fields, with up to 30 graphs in one
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 Advanced Learners Math Tutors  advancedlearners.com
This company provides inhome private math tutoring, at the K12 or collegiate level.
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 Advanced Topics in Mathematics  Anthony Beckwith
Page for a high school course exploring fractals, the Global Positioning System, number theory, topology, chaos theory, and the history of mathematics. Syllabus and brief description of each topic.
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 Advancing Student Achievement: Math Mentoring Grants  The Actuarial Foundation
A school grant program that provides funding to develop math enhancement materials and brings qualified professional actuaries from the community into schools as math mentors to share their enthusiasm, expertise, and love for math. The Actuarial Foundation
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 Adventitious Geometry  Tony Davie; School of Mathematical and Computational Sciences, Univ. of St Andrews, Scotland
A brief illustrated page about a seemingly simple problem involving an isosceles triangle with some angles given. Under what circumstances are all the angles in the diagram rational multiples of pi? Further discussion of adventitious quadrangles and concurrent
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 AdventureOnline.com  Learning Outfitters, Inc.
Interdisciplinary curricula that use the Web to connect students to expeditions from around the world, creating motivating, realtime materials for K12 classrooms. Thematic content includes traditional and online lessons, games, quizzes, research stations,
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 Adventures in Teaching  Darryl Yong
Blog "about the intellectually and emotionally demanding work of teaching" by a professor of mathematics at Harvey Mudd College. The director of the Claremont Colleges Center for Teaching and Learning, Yong began the blog in 2009 as a way to journal his
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 Adventures in the MathZone  Ivars Peterson (MathTrek)
Ivars Peterson and his wife, Nancy Henderson, have written "a book that introduces children to a variety of ideas also of interest to today's mathematicians: knots, map coloring, Möbius strips and topology, prime numbers, chaos, fractals, and more. Our
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 A. Einstein: Image and Impact  American Institute of Physics
All about Albert Einstein. Essays, photographs, and stories; hear Einstein explain his famous equation E=mc^2. Contents: Formative Years; The Great Works; E=mc2; World Fame; Public Concerns; Quantum and Cosmos; The Nuclear Age; Science and Philosophy;
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 Aepryus Software
Aepryus is a developer of math, physics, and evolutionary biology software for Microsoft Windows computers. Download, purchase, or obtain information about programs such as Aepryus Graph, a function plotting application capable of 2D and 3D shaded plots
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 AERA Special Interest Group: Research in Mathematics Education  Jeff Shih
Research in Mathematics Education is a Special Interest Group of the American Educational Research Association. The purpose of SIG/RME is to promote and to disseminate research, development, and evaluative efforts in mathematics education, and to promote
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 The Aerobie^{®} Flying Ring  Alan Adler
A scientific paper by the inventor of the Aerobie® flying ring: "The most difficult aspect of the design task is that the disc must fly over a wide range of α (angle of attack).... A conventional Frisbee disc partially accomplishes this by employing
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