 3D and SIRDS images  Jonathan Bowen
An archive of single image random dot stereo (SIRDS) and other 3D images, together with related information and software. It is available via anonymous FTP. Plain text information on frequently asked questions concerning SIRDS, an index and a README
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 3DCalculator  Andre Bullitt Software
Download a demo (Windows 95), see a short video, or purchase for U.S. $10.00 online.
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 3D Drawing and Geometry  Cathi Sanders
A Math Forum Summer 1998 Institute project that uses examples of paintings, architecture, etc. to analyze different types of 3D drawings, and teaches students how to create them. Careers in 3D drawing that use these techniques, from architecture to
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 3DMathematikprogramm  Ingenieurbüro Riescher
German shareware program for Windows: MATHPROF ist ein einfach bedienbares Mathematikprogramm mit graphischen 2D und 3DDarstellungen, für Schüler, Studenten und Lehrer. Auch lassen sich einfache Konstruktionen im 2D und 3DBereich erstellen und analysieren.
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 3D Nauta
A threedimensional spatial, topological problem/game with Web interfaces in Spanish, French, and English. Of two versions of the game, one is accessible
to most people, while the other can be made difficult exponentially. You are invited to order your
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 3D Stars  Free Instructions  James E. Garner
Free instructions for making 3D paper stars, using basket weave technique.
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 3DXplorMath  Richard Palais
3DXplorMath creates visualizations of mathematical objects and processes. This tool has builtin algorithms for displaying mathematical objects such as plane curves, space curves, surfaces, conformal maps, polyhedra, ordinary and partial differential
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 4000 Years of Women in Science  University of Alabama
Over 125 women scientists from our scientific and technical past, with biographies, references, and photographs. For Mathematicians, see Listing by Discipline.
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 42eXplore  Annette Lamb and Larry Johnson
Web projects that offer definitions, activities, four good starting points, and many more links and resources for thematic topics such as charts and graphs; codes, ciphers and secret messages; fractals, tessellations, geometric shapes, and figures; number
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 42nd International Mathematical Olympiad: Math Expands Horizons  Dr. Walter E. Mientka, Executive Director
This event brings to the USA 500 of the most talented high school age mathematicians from more than 80 countries. Washington, DC, hosts the Olympiad, with opening ceremonies on July 4, 2001. The American mathematics community uses this opportunity to
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 The 4th Spatial Dimension
An introduction to the visualization of 4 dimensional space. Numerous resources.
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 50 States' Certification Requirements  College of Education, University of Kentucky
Links to teacher certification requirements for all 50 states, as well as a K12 job opportunities database.
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 5 Numbers  Simon Singh and Marcus du Sautoy, BBC Radio 4
Web pages and Real Audio Music downloads of fifteen minutelong radio broadcasts that take a "quirky look" at zero, pi, the golden ratio, i, and infinity. "Hear about the stark reality behind the imaginary number, try a slice of pi, find out about the
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 5 x 5 Magic Squares  H. B. Meyer
An interactive page dedicated to the construction of 5 x 5 magic squares. You may move the numbers manually, watch the computer slowly create a magic square, or have the computer quickly generate a magic square. Requires JavaScript.
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 6+1 Trait Writing (NWREL)  Northwest Regional Educational Laboratory
A scoring guide (rubric) not specifically for mathematical writing, but useful nonetheless. Subjects included: ideas and content, organization, voice, word choice, sentence fluency, and conventions. Also links to other Northwest Regional Educational Laboratory
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 65m.p.h. Speed Limits, Large Primes, and Japanese Exams (Math Chat)  Frank Morgan; Christian Science Monitor
When a state increases a highway speed limit from 55 to 65 miles per hour, by what percent does the road capacity (in cars per hour) change?
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 82 Games  Roland Beech
Indepth statistical coverage and analysis of the National Basketball Association (NBA). The site analyzes teamwide or playerspecific shot selection and shot clock usage, production by position, player pairings, foul drawing, turnovers, and clutch play
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 8 Foxes
A blog in which geometry questions of different levels are posted daily.
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 8 is Great: Math Games
Addition, multiplication, and division practice at the elementary level. Tips and tricks offered for 9 and 11 times tables, factoring a quadratic expression, and generating the Fibonacci sequence. Also includes a sudoku puzzle.
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 8th International Congress on Mathematics Education (ICME)
ICME 8, July 1421, 1996 in Seville, Spain. The Math Forum hosted the Web component of Topic Group 19  ComputerBased Learning Environments. Complete abstracts and list of contributors; Online electronic poster sessions. Part of a larger series of firsthand
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 9th Grade Math Proficiency Test  NASA Lewis Learning Technologies Project
9th Grade Math Practice Questions to test addition, multiplication, wordproblem skills, and basic algebraic skills. Includes answers and explanations. From the Proficiency Building Activities of the NASA Lewis Research Center K12 Program.
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 A1 All Subjects AtHome Tutoring Service®  Raymond La Barbera
Specializes in private, onetoone, athome instruction in all subjects, grades, levels, and tests. Instructions on hiring a tutor; links to tutorials; advice for working with A1 All Subjects, and for starting your own tutoring business.
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 AAMT: Australian Association of Mathematics Teachers
A federation of affiliated associations representing all States and Territories within the Commonwealth of Australia, AAMT acts as a national network and council of mathematics educators. AAMT provides serial publications and a regular newsletter, resources
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 Aard 3D Puzzles  AardAsNails Software
Rubik's cubelike puzzles to solve online. Virtually twist and spin a pyramid, cube, diacube, or diamond, selecting solid or transparent views. Purchase the full version for up to ten levels of difficulty and preset problems.
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 AASA Online  American Association of School Administrators
A professional organization focusing on improving the condition of children and youth, preparing schools and school systems for the 21st century, connecting schools and communities, and enhancing the quality and effectiveness of school leaders. The site
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 The Abacus: The Art of Calculating with Beads  Luis Fernandes
A tutorial on using the abacus  a calculator whose earliest known use is circa 500 B.C. by the Chinese civilization. Addition, subtraction, division and multiplication can be performed on a standard abacus. Beginning in about 1600 A.D., use and evolution
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 Abakus  Lothar H. Hofmann
Download a free Windows Japanese sorobanabacus. (Site is in Swedish.)
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 Abbott and Costello's Wacky Math  Ivars Peterson (MathTrek)
The Math in the Movies Web page provides an annotated list of films in which mathematics plays some sort of role. The choices range from the calculus lessons of Stand and Deliver to the mystifying numerology of the 1998 thriller Pi. Among the notable
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 About a Line and a Triangle  Interactive Mathematics Miscellany and Puzzles, Alexander Bogomolny
An interactive page illustrating how the relation between the vertices and the sides of a triangle can be investigated by rotating the triangle.
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 About Big Numbers  Joshua Honigwachs
Explores the world of big numbers, from one thousand to a googol. Identifies
what objects in the universe, from atoms to large scale structures, match these
numbers.
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 About Ellipses  Math Forum, Ask Dr. Math Common Question
A selection of answers to questions about ellipses, such as calculating their areas and perimeters, graphing them, and determining equations for them.
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 About e  Math Forum, Ask Dr. Math FAQ
What is e? Who first used e? How do you find it? How many digits does it have? e = 2.71828... and is the base of natural logarithms.
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 About Proofs  Math Forum, Ask Dr. Math FAQ
What is a proof? How do you write a twocolumn proof?
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 About Rainbows  Beverly T. Lynds
A tutorial on the physical nature of the rainbow, with graphics and text references. The traditional rainbow is sunlight spread out into its spectrum of colors and diverted to the eye of the observer by water droplets. The "bow" part of the word describes
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 About Rubik's Cube  Dan Knights
See the author's collection of Rubik's cubes, his solution and timing methods, thoughts on solving Rubik's Cube with your eyes closed, and suggestions for lubricating your cube and where to get them.
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 About Temperature Sensors
A Web guide to contact (thermometers, etc.) and noncontact (thermal imagers, etc.) temperature sensors and their uses in temperature measurement. Includes vendors, displays, applications, meetings, and more.
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 About time  Keith Devlin (Devlin's Angle)
An essay on time in mathematics and engineering (the time that we measure and use to regulate our lives). How did we come to measure time in the first place? What exactly is it that our timepieces measure? And what scientific principles do we use to construct
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 abraCAdaBRI  Yves Martin
Liens et exercises pour le logiciel Cabri Géomètre:
geéométries; affine plane; vectorielle plane; affine de l'espace; non euclidennes; logique (Alice); dossier coniques; pratique de Cabri. In French.
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 The Absentminded Artist's Fractal Art Parade  Douglas R. Cootey
Fractal images treated as a photographer would treat a landscape, incorporating design and color composition into each piece. Images were made with Fractal eXtreme, Ultra Fractal, FractalPro, Lyapunovia, and Mand2000.
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 Absolute Value  Math Forum, Ask Dr. Math Common Question
A selection of answers to questions about absolute value, such as reallife applications, its place in order of operations, and solving algebra inequalities that contain absolute values.
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 Abstracts  The Roles of Calculators in the Classroom  International Congress of Mathematics Education
Abstracts of papers presented in Topic Group 18 of the International Congress of Mathematics Education held in Seville in July, 1996. Online and PDF versions of reports on numerous studies of calculator use in a wide variety of classroom situations. Introduction,
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 ABsurd MAth: Prealgebra from another dimension  Michael Cain; HRM Video; LearningWave Communications
An interactive problemsolving game series where the ultimate power consists of mathematical skill and knowledge. Many pages have hidden clues and areas; when players need help, they may email the staff for assistance. Teachers and parents may request
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 Academia de Matemáticas
Método para el aprendizaje de matemática.
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 The Academic Advantage
Oneonone instruction in the convenience of your own home that focuses on academic improvement and building confidence. Math topics tutored range from basic arithmetic to trigonometry, from prealgebra to precalculus, from algebra to geometry, and also
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 Academic Exchange Quarterly
The Academic Exchange Quarterly invites research on affective learning issues such as persistence, selfconfidence, attitudes, anxiety, assessment, intervention, and pedagogy. Submissions are welcome from researchers, teacher action researchers, administrators
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 Academic Info  Mathematics
A listing of online college and research level math resources. The target audience is the college and university community; however, the subject guides will prove useful to high school and general users as well.
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 Academic Innovations
Academic Innovations publishes a textbook series (Career Choices  five titles), an interdisciplinary curriculum designed to be used in English/Language Arts, Math, Social Studies, and/or SchooltoWork and Tech Prep classrooms. The company sponsors a
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 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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