 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
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 Archimedes Geo3D  Andreas Goebel
Software for interactive geometry in three dimensions that you can use to: construct points, lines, spheres, planes, triangles and many more objects; trace points, lines or circles to get locus lines or locus surfaces; drag objects and see the rest of
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 Archimedes' Laboratory  Gianni A. Sarcone and Marie J. Waeber
Archimedes' Laboratory invents, creates, and develops handson thinking games which help teach mathematical applications. They also create and manufacture original educational manipulatives and puzzles to support promotional activities. The resources
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 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
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 Archimedes' Square (Stomachion)  Kadon Enterprises, Inc.
Square puzzle dissected into 14 tiles, described in Archimedes' palimpsest. Oldest documented puzzle in history, from ca. 250 B.C. Now known to have 536 distinct solutions.
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 Archimy.com: 3D Graphs Online  Denis Kozyr
A service for drawing the graphs of all kinds of functions. Users can define a graph by specifying the formula for the coordinates x, y, and z.
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 Archives Henri Poincaré  PierreEdouard Bour and Manuel Rebuschi
La laboratoire de Philosophie et d'Histoire des Sciences (LPHS) réunit des scientifiques intéressés à l'histoire et à l'épistémologie de leur disciplines et des philosophes et historiens prêts à
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 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
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 Archives of NMBRTHRY@LISTSERV.NODAK.EDU (Number Theory List)  North Dakota Higher Education Computer Network (NODAK)
Searchable archives of postings, September 1987  present.
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 Arché: Philosophical Research Centre for Logic, Language, Metaphysics, and Epistemology  Crispin Wright, Director; University of St. Andrews, U.K.
Arché is a new research centre within the School of Philosophical and Anthropological Studies, St Andrews. Its goal is the promotion and publication of research of the highest quality in metaphysics, formal and philosophical logic, philosophy of
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 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,
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 Arctangent Formulas for Pi  Roy Williams
What is a reasonable way to compute Pi? Methods that have been chosen for many of the groundbreaking digitstorms in the past have been based on arctangent formulae.
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 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.
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 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.
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 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
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 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
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 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.
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 Area Of A Circle  Kuldeep Kaur
Lessons and worksheets to find the area of a circle. Kaur has posted stepbystep instructions through this blog, which dates back to December, 2011.
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 The Area of a Circle (SMILE)  Edwina R. Justice, Gunsaulus Academy
A grade 8 lesson designed to teach the relation between circumference and diameter and how that relation, called pi, is used in the formula for the area of a circle. From the Geometry and Measurement section of a collection of almost 200 single concept
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 The Area of a Circle (Version 2.0) (SMILE)  Edwina R. Justice, Gunsaulus Academy
A grade 8 lesson designed to review areas of plane figures; determine the relation between the circumference and diameter of a circle; show the geometric representation of the area of a circle as the shape of a parallelogram; and use the formula for computing
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 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
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 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
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 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.
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 Are You Ready for Calculus  Department of Mathematics and Statistics, University of New Brunswick
A test designed to give students an idea of what UNB expects them to be able to do. Answers are provided.
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 Argus Clearinghouse: Math and Statistics  Argus Associates, Inc.
Guides on topics pertaining to the study of numbers, measurement, and physical or virtual space.
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 Aristotle and the Paradoxes of Logic  Gilbert Voeten
At about the same time that set theory began to influence other branches of mathematics, various contradictions, called paradoxes, were discovered. A paradox, however, is only due to a striking violation of at least one of Aristotle's laws of logic. The
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 ArithmaClick  J. D. Brown
Practice addition and multiplication while keeping score.
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 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
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 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
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 ArithmAttack  David Baurac, Argonne National Laboratory
How many computergenerated arithmetic problems can you answer in 60 seconds? Choose an operation (add, subtract, multiply, divide, random operator) and high and low numbers (012). Enter an answer and check it; after 60 seconds the program will tell
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 Arithmemouse  Tinman Learning, Inc.
Arithmemouse Times Tables is a multiplication game that facilitates teaching children multiplication factsnot just a drill. It is nonviolent, with light puzzles, and without life meters or punishment for failure. A free demo is available. Arithmemouse
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 Arithmesticks  Michael Varma, Magical Concepts
Simple equations made out of sticksmove one stick to make the equation correct. This site has example problems in each of the four basic operations, and sells kits of sticks and equations cards.
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 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.
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 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.
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 Arithmetic CD  John Banfill
The Arithmetic CD contains over 1700 basic arithmetic lessons for K8 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.
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 Arithmetic for Home Schooling  Bill Hemmer; Hemmer Publishing Company
A traditional program covering math from basic arithmetic through prealgebra, for grades 37, focusing on six subject areas: whole number, fractions, decimals, percents, measurement, and prealgebra. The order and format of the topics allow flexibility
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 Arithmetic (Funk & Wagnalls Multimedia Encyclopedia)  Lycos Zone: Mathematics
A short article on arithmetic: fundamental definitions and laws; theory of divisors; fractions; and decimals.
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 Arithmetic Game  Terry Ford
Autoscoring timed practice in singledigit arithmetic and order of operations. Race the countdown clock to unlock more difficult levels involving parentheses and mixed expressions.
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 Arithmetic  Math Forum
Links to some of the best Internet resources for arithmetic: classroom materials, software, Internet projects, and public forums for discussion.
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 Arithmetic Properties of Binomial Coefficients (Organic Mathematics Proceedings)  Andrew Granville
Many great mathematicians of the nineteenth century considered problems involving binomial coefficients modulo a prime power (for instance Babbage, Cauchy, Cayley, Gauss, Hensel, Hermite, Kummer, Legendre, Lucas and Stickelberger). They discovered a variety
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 Arithmetics WARM UPS  Cornick, Jonathan; Guy, G. Michael; Russell, Andrew S. H.; and Holt, Robert J.
This free, open, online supplement to the Arithmetics WARM UPS Textbook provides practice with place value, arithmetic, order of operations, word problems, and more. Rendered in MathJax, each "lab" in this "no calculator zone" instantly scores multiple
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 Arithmetic Village  Kimberly Moore
Arithmetic Village introduces number placement, addition, subtraction, multiplication, and division through storybook characters Polly Plus, Linus Minus, Tina Times, and King David Divide. arithmeticvillage.com, which accompanies the author's rhyming
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 Arithmetiles: Speed Math Skills
Online game to warm up your brain with fairly easy math challenges. Downloadable versions available for purchase.
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 Aritm  Mikael Bonnier
A Java applet for simple mental calculation, drilling on basic arithmetic (addition, subtraction, multiplication, or division, with 1 or 2digit terms), in digits, words, or Roman numerals. It will tell you when your answer is wrong, and how many problems
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 Arizona Center for Mathematical Sciences (ACMS)  University of Arizona, Tucson
An interdisciplinary research group that enjoys close ties with the Departments of Physics and Optical Sciences. The main goal of ACMS research is to understand nonlinear processes in natural phenomena. Research topics include nonlinear optics, fluids,
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 Arizona Mathematical Software
A collection of approximately 60 educational programs that are designed for use by instructors and students in classroom, laboratory, and home environments. Software falls into four categories: Are You Ready?; Slide Shows; Teacher Aids; Toolkits. It runs
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 The Arlington Algebra Project  Arlington Central School District
Exercises and homework, organized into twelve units, written by 25 Arlington math teachers from the LaGrangeville (NY) high school and middle schools.
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 ARMA Grapher  Aaron Bono
An applet designed to give those new to the field of Time Series a feel for the
"look" of some basic time series models, to help students and instructors generate random data for simple ARMA models and get a feel for what the data might look like. It
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 Arnd Roth  Arnd Roth, Institute for Theoretical Physics, Heidelberg, Germany
Arnd Roth studies computational physics and neuroscience. This page provides documentation and code for related Mathematica notebooks, and a notebook for the Knight's Tour chess problem, available online. Also links to abstracts or text of many of Roth's
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 Around the Dartboard  Ivars Peterson (MathLand)
The numbers on a standard dartboard have the following order, going clockwise starting at the top: 20, 1, 18, 4, 13, 6, 10, 15, 2, 17, 3, 19, 7, 16, 8, 11, 14, 9, 15, and 5. Why this particular order? A possible criterion for designing a dartboard is
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