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  1. amtnys - Math Forum
    The general discussion group of the Association of Mathematics Teachers of New York State. Use this service to discuss items of interest to math educators everywhere. Read and search archived messages; and register to post to the discussions. ...more>>

  2. Analysis & Knowledge - Sanford Aranoff
    Download data analysis software, such as Patterns, which analyzes and charts trends in stock market using Andrews concepts. See also this former Rutgers University physics professor and current high school educator's thoughts on teaching and help file ...more>>

  3. Analyzing Numeric and Geometric Patterns of Paper Pool (i-Math Investigations) - Illuminations; National Council of Teachers of Mathematics (NCTM)
    An online, interactive, multimedia math investigation. The interactive paper pool game in this i-Math investigation provides an opportunity for students to further develop their understanding of ratio, proportion and least common multiple. Students develop ...more>>

  4. Ancient Mathematics - SunSITE's Vatican Exhibit; Library of Congress
    Math history: math and astronomy in the ancient world. Greek Mathematics, Ptolemy's Geography, Greek Astronomy. Scholarship supported science in this world where faith and science were not yet seen as two irreconcilable cultures. Euclid (Elements, Optics); ...more>>

  5. Ancient Writings Revealed! - The Exploratorium
    Ancient ideas met modern science at the Exploratorium, San Francisco, CA, on August 4, 2006. Using state-of-the-art scientific tools, once-hidden writings by the ancient Greek mathematician Archimedes were uncovered, revealing evidence of science not ...more>>

  6. ... and Math Tutoring - Stuart Raffeld
    This one-on-one tutoring service meets tutees throughout California's West San Fernando Valley, and also tutors online, over-the-phone, and by e-mail. Posts in Stu's blog, which date back to February, 2011, have included "Ten Ways to Improve your SAT ...more>>

  7. Andy Norton's Web Page - Dept. of Mathematics Education, Univ. of Georgia
    Illustrated essays and explorations of algebra and geometry using various technology, including TI-85 calculators, CBL's and computer software such as Geometer's Sketchpad (with sketches to download), Algebra Expressor, and Excel, by a grad student in ...more>>

  8. The Angle Defect of a Polyhedron (Geometry and the Imagination) - Conway, Doyle, Gilman, Thurston; The Geometry Center
    The angle defect at a vertex of a polygon is defined to be 2 pi minus the sum of the angles at the corners of the faces at that vertex. What is the angle sum for a polygon (in the plane) with n sides? Determine the total angle defect for each of the 5 ...more>>

  9. Angles and angle terms - Mark Motyka, Math League Multimedia
    Definitions and illustrations: What is an angle?; Degrees: measuring angles; Acute angles; Obtuse angles; Right angles; Complementary angles; Supplementary angles; Vertical angles; Alternate interior angles; Alternate exterior angles; Corresponding angles; ...more>>

  10. Angles of Reflection - John Benson and P. J. Karafiol
    A back-and-forth intergenerational blog on math education, begun in January, 2011, by two Presidential Awardees in Mathematics from the state of Illinois. ...more>>

  11. Animals & Art - M. Crook
    A gallery of fractal images created using Ultra Fractal. ...more>>

  12. Animated Math Glossary - Math Advantage - Harcourt Brace School Publishers
    A K-8 glossary of common mathematical terms, categorized by grade. Each entry has an example, most of which are animated. An "other" section at the end of the alphabet gives tables of metric and customary measurements, time, formulas, and symbols. You ...more>>

  13. Animated Proof of the Pythagorean Theorem - Mark D. Meyerson; Mathematics Dept., U.S. Naval Academy
    Starting with a right triangle and squares on each side, the middle size square is cut into congruent quadrilaterals (the cuts through the center and parallel to the sides of the biggest square). Then the quadrilaterals are hinged and rotated and shifted ...more>>

  14. Annenberg Institute for School Reform (AISR) - Brown University
    The Annenberg Institute develops, shares and acts on knowledge that improves outcomes of schooling in America, especially in urban communities and in schools serving disadvantaged children. Institute Projects: Rethinking Accountability; Building Capacity; ...more>>

  15. Annie's Sketchpad Activities - Annie Fetter
    Handouts for activities that incorporate JavaSketchpad, including: making a presentation sketch; investigating the properties of quadrilaterals; the Euler segment; morphing a simple figure to a circle; Napoleon's theorem; drawing a box and its net; and ...more>>

  16. Annual Pi Day - The Exploratorium, San Francisco, CA
    "Founded by the the Exploratorium's own Prince of Pi, physicist Larry Shaw, Pi Day has become an international holiday, celebrated live and online all around the world." Read a brief history of pi; find activities for cutting π and wearing π; and ...more>>

  17. Answer Ace - MathSupport Co.
    A Windows 95/98/NT math problem solver that helps students learn or review arithmetic, pre-algebra, and basic algebra skills. Students enter specific problems and the software provides answers along with step-by-step help. A free trial is available for ...more>>

  18. Ant Math (MatheMUSEments!) - Ivars Peterson (Math Muse for Kids)
    Imagine stepping into a pitch-black room. How might you figure out the room's size in the dark? You could, for example, carefully follow the walls and count how many steps you took going from one corner to the next all the way around. That would give ...more>>

  19. Apex Learning - Apex Learning
    Standards-based online curriculum for secondary education in the core academic subjects and Advanced Placement, available in multiple formats or packages to address differing purposes and populations: enrichment, credit recovery and remediation, virtual ...more>>

  20. APlusStudent Online Learning
    Interactive math lessons with graphics, animation, and audio, based on Micromedia Flash technology. Teacher-designed, standards-based lessons. Parents can monitor the progress of their children. There is also homework help and an online gallery where ...more>>

  21. Apogee Tutors - Vimal Patel
    Danbury, CT based tutoring services. We provide one-on-one tutoring, group tutoring for middle school through college students. ...more>>

  22. Appetizers and Lessons for Math and Reason - Alan Selby
    Logic Appetizers to test or or improve reading, writing and thinking skills, with definitions, concepts and proofs in many subjects (Chains of Reason; One or Two-Way Implications; Islands & Divisions of Knowledge; Deception); Advice (How to Study ...more>>

  23. Applications and Misapplications of Cognitive Psychology to Math Education - Anderson, Reder, Simon
    A critical view of constructivism by three leading cognitive psychologists at Carnegie Mellon University. Decomposition and decontextualization; situated learning; constructivism; recommendations for research and instruction; overall conclusions; references. ...more>>

  24. Aquí Matemàtiques (Catalán) - Carlos Romero
    Web and interactive materials in Catalán designed to facilitate and improve teacher training in mathematics. Goals: to provide curricular incentives for integrating technology into primary and secondary level teaching; facilitate access to curricula; ...more>>

  25. Arabic Mathematics - David Joyce; Dept. of Mathematics & Computer Science, Clark University
    Resources on the history of Arabic mathematics, with a map, a list of mathematicians, sources, and a Bibliography. ...more>>

  26. Arabic mathematics: forgotten brilliance? - MacTutor Math History Archives
    Linked essay exploring the debt we owe to Arabic/Islamic mathematics. In many respects the mathematics studied today is far closer in style to that of the Arabic/Islamic contribution than to that of the Greeks. Certainly many of the ideas previously thought ...more>>

  27. Arabic Numerals (Islam and Islamic History) - Nawwab, Speers, Hoye; Arabian American Oil Co.
    The system of numeration employed throughout the greater part of the world today was probably developed in India, but because it was the Arabs who transmitted it to the West, the numerals it uses have come to be called Arabic. This page shows the early ...more>>

  28. The Arabic numeral system - MacTutor Math History Archives
    Linked essay exploring the transmission of Indian numerals first to the Arabic/Islamic peoples and from them to Europe. The eastern and western parts of the Arabic world (North Africa and Spain) both saw separate developments of Indian numerals with relatively ...more>>

  29. Arbelos Internet Math Society - Bert Liberi and William F. Widulski, Westchester Communtiy College
    A mathematics society dedicated to the pursuit of elegance in problem-solving. Every month, solve challenging problems that require "more imagination than memorization." Also, access old problems and solutions; and study a list of heuristics of problem-solving, ...more>>

  30. arbitrarilyclose - Annie Perkins
    Blog by a secondary math teacher in the Minneapolis Public Schools for whom the phrase arbitrarily close "encapsulates the things I can control, the things I cannot, the impossibility of this craft [of teaching], and the beauty of the exploration despite ...more>>

  31. Archimedes - Chris Rorres, Drexel University
    A collection of information on Archimedes' life and achievements, complete with historical quotes, illustrations, and animations. The site covers Archimedes' inventions and accomplishments: Archimedes' Claw, Burning Mirrors, the Golden Crown, the Archimedes ...more>>

  32. Archimedes' Laboratory - Gianni A. Sarcone and Marie J. Waeber
    Archimedes' Laboratory invents, creates, and develops hands-on thinking games which help teach mathematical applications. They also create and manufacture original educational manipulatives and puzzles to support promotional activities. The resources ...more>>

  33. Archimedes Palimpsest - The Walters Art Gallery
    An introduction to the people, places, times, and historical significance of the Archimedes Palimpsest, a compendium of mathematical treatises by Archimedes of Syracuse. The manuscript itself includes the only copy of the treatise Method of Mechanical ...more>>

  34. Archives of American Mathematics - The Dolph Briscoe Center for American History, The University of Texas at Austin
    The only archival repository in the United States solely dedicated to collecting, preserving, and providing access to the records of American mathematicians and mathematical organizations for use by historians, mathematicians, educators, and others interested ...more>>

  35. ArcLessons - Environmental Systems Research Institute, Inc. (ESRI)
    Lessons for using geographic information systems (GIS) in the classroom include X and Y Coordinates Rule the Map, Investigating Temperature Extremes in the USA, Baseball Radio Station Analysis, The Dust Bowl, The Great Migration, Japanese American Internment, ...more>>

  36. Area and Diameter - NASA Lewis Learning Technologies Project
    Mrs. Bosley wants a big round piece of plastic to throw over her little boy's round sandbox to keep the sand clean. The sandbox has a diameter of 3 meters. Approximately how big will the round piece of plastic need to be? A detailed answer is provided. ...more>>

  37. Area and perimeter - Mark Motyka, Math League Multimedia
    Definitions and illustrations: Area; Area of a square; Area of a rectangle; Area of a parallelogram; Area of a trapezoid; Area of a triangle; Area of a circle; Perimeter; Circumference of a circle. ...more>>

  38. Area and Perimeter (SMILE) - Monica Starks, John Fiske Elementary
    A middle school lesson on measuring and calculating the area and perimeter of squares, rectangles, triangles, etc. From the Geometry and Measurement section of a collection of almost 200 single concept lessons by the Science and Mathematics Initiative ...more>>

  39. Area, Arithmetic and Algebra (SMILE) - Larry Freeman, Kenwood Academy
    A lesson designed to show teachers how area of rectangles and squares can motivate the learning of multiplication rules for certain binomials; how students can perform arithmetic based on these identities; and several applications of the "distributive ...more>>

  40. Area of a Circle - Jon Seaton
    Enter a radius, diameter, circumference, or area of a circle, and this simple JavaScript calculator returns all of those measures. ...more>>

  41. Area Of A Circle - Kuldeep Kaur
    Lessons and worksheets to find the area of a circle. Kaur has posted step-by-step instructions through this blog, which dates back to December, 2011. ...more>>

  42. Area Under Curves: The Integral - Don Cohen (The Mathman)
    Area on the geoboard; Plotting points on a computer or programmable calculator to find the area under curves; Finding the area under curves on graph paper. Sample problems with some answers and a program to plot points - from Chapter 13 of Don Cohen's ...more>>

  43. Are Mathematicians Turning Soft? - Keith Devlin (Devlin's Angle)
    An article about 'soft mathematics'. "...In order to capture some of the abstract patterns and structures of mind and language, linguists sometimes find it convenient (perhaps necessary) to make use of mathematics, or at least mathematical notation or ...more>>

  44. Are You Better Than Average? - Todd Curtis
    Dice game developed to quickly demonstrate some of the basics of probability. You'll need one pair of dice, a throwing tray or other flat surface, and a score sheet. ...more>>

  45. Arithmagic - Ivars Peterson (MathTrek)
    Arthur T. Benjamin eschews the usual trappings of the magician's trade. Calling himself a mathemagician, he astonishes audiences with amazing feats of mental arithmetic. Behind the scenes, he reveals how you, too, can look like a genius without really ...more>>

  46. Arithmagic (MatheMUSEments!) - Ivars Peterson (Math Muse for Kids)
    Prof. Arthur Benjamin amazes audiences by multiplying numbers in his head faster than someone using a calculator. Benjamin says that anyone - young or old - can learn to do the same feats of mental arithmetic. All it takes is a memory for numbers and ...more>>

  47. Arithmetic and Algebra - Interactive Mathematics Miscellany and Puzzles, Alexander Bogomolny
    More than 110 games or puzzles having to do with arithmetic or algebra, with extensive discussions and solutions. Most require a browser capable of displaying JavaScript or Java. ...more>>

  48. Arithmetic and Algebra Review Problems - Alan Selby
    Arithmetic and algebra review problems to help people check or diagnose arithmetic skills and other calculation or algebra skills. Includes a 20x20 times table. ...more>>

  49. Arithmetic CD - John Banfill
    The Arithmetic CD contains over 1700 basic arithmetic lessons for K-8 students. Each lesson has an explanation, some interactive practice, and challenge games. The lessons on the CD consist of interactive html files and require a web browser to operate. ...more>>

  50. Arithmetic - Math Forum
    Links to some of the best Internet resources for arithmetic: classroom materials, software, Internet projects, and public forums for discussion. ...more>>

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