 All About Fractions (AAA Math)  John Banfill
Interactive math exercises, lessons, and games covering identifying, adding,
subtracting, multiplying, dividing, and converting fractions.
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 All About Multiplication (AAA Math)  John Banfill
Free, interactive math exercises, lessons, and games teaching multiplication tables, fact and multiplication of whole numbers, decimals, and fractions.
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 All About Percents (AAA Math)  John Banfill
Interactive math exercises, lessons, and games covering finding, converting, and using percents.
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 All About Subtraction (AAA Math)  John Banfill
Free, interactive math exercises, lessons, and games covering beginning subtraction facts and subtraction of whole numbers, decimals, and fractions.
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 allmath.com  Arbor Media, Inc.
Math tools (flash cards, a metric converter); games (magic square), and reference pages: biographies, a glossary, the multiplication table, metric conversion factors, and an ask an expert service.
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 Alphabet Geometry  Jamie Tubbs, MisterTeacher.com
Learn about geometry by looking at letters. Included are interactive Flash movies on transformations, angles, and similar letters. Movies on parallel and perpendicular lines are planned.
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 Alternative Math Club
Interactive practice with problems typically found in Japan: exams for junior high school math, high school math, and college math; and entrance exams for high shool and for university. Also available in Japanese.
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 The Altitudes and the Euler Line  Interactive Mathematics Miscellany and Puzzles, Alexander Bogomolny
A proof of the existence of the orthocenter of a triangle embodying several concepts such as Morley's complex interpolation theory, Napoleon's theorem, and Morley's miracle; with examples of the theorems and a geometric explanation of the Euler Line and
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 The Altitudes  Interactive Mathematics Miscellany and Puzzles, Alexander Bogomolny
A collection of proofs of the concurrency of altitudes in triangles, featuring a Java applet with which one can see the various points, lines, triangles, and circles associated with any given triangle.
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 The Altitude Theorem for Equilateral Triangles  Web Feats Workshop II
Use the applet to intrigue students with a surprising property of equilateral triangles, stimulate their curiosity to wonder why the property is true, then lead them to understand how the property can be proven in an unexpected way. This workshop was
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 Amazing Applications of Probability and Statistics  Kelly Rogers; Intuitor.com
Intuitor.com's Prob. and Stat. page provides clear and concise information
on a variety of topics covered in AP Statistics, including: Probability,
binomial coefficients, data analysis, random numbers, skewness, hypothesis
testing, and power. This
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 Amby's Math Instruction, Reinforcement, and Learning Activities  Amby DuncanCarr
Stepbystep tutorials, with autoscoring quizzes: order of operations, solving word problems, properties of numbers, prime numbers, prime factorization, greatest common factors (GCF), least common multiples (LCM), simplifying (reducing) fractions, changing
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 AMOF: The Amazing Mathematical Object Factory  Frank Ruskey
Combinatorial objects are everywhere. How many ways are there to make change for $1 using unlimited numbers of coins of all denominations? Each way is a combinatorial object. AMOF is part encyclopedia and part calculator, a teaching tool that generates
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 Amortization Schedule
JavaScript calculators for figuring out loan amortizations, investment fees, debt payoffs, savings, timesheets, and tips; for simulating investments; and for comparing savings rates and mortgages.
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 Analog Gadgets  Interactive Mathematics Miscellany and Puzzles, Alexander Bogomolny
Java simulations of analog gadgets. Includes an analog device simulation for drawing ellipses, a Peaucellier Linkage simulation, an angle trisection demonstration, a demonstration/essay on cycloids, and applets on geoboards (with a proof of Pick's Theorem)
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 The Analytical Engine  John Walker
The mathematician Charles Babbage designed an Analytical Engine, a mechanical precursor to the computer, in the late 1800s. Read historical documents related to the Engine, including Blaise Pascal's account of his mechanical adding machine (in French),
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 Analyzing Numeric and Geometric Patterns of Paper Pool (iMath Investigations)  Illuminations; National Council of Teachers of Mathematics (NCTM)
An online, interactive, multimedia math investigation. The interactive paper pool game in this iMath investigation provides an opportunity for students to further develop their understanding of ratio, proportion and least common multiple. Students develop
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 Andrew M.H. Alexander
JavaScript by Alexander includes "the gear seer," which shows not just bike gear ratios but gear inches and meters development. Input wheel and tire size to see speed at a given cadence. This bicycle drivetrain visualizer further compares different drivetrains,
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 The Angle Bisectors  Interactive Mathematics Miscellany and Puzzles, Alexander Bogomolny
A discussion of why the anglebisectors of a triangle meet at the incenter of the triangle, in several different ways, involving: cevians, the transitivity property of equality, axes of a 2line, altitudes and orthic triangles, and complex numbers.
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 The Animated Telegraph Equation  Joel Feldman; Department of Mathematics, Univ. of British Columbia, Vancouver, BC, Canada
An applet illustrating the behaviour of solutions of the telegraph equation.
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 Anisohedral Tilings Page  John Berglund
Tilings and tessellatings with 2anisohedral and other isohedral tilings. With explanations and a bibliography. Berglund's JavaSketchpad applets include circles in a lattice shape; affine polygons, which extends Napoleon's theorem from a triangle to a
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 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
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 Apex Learning  Apex Learning
Standardsbased 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
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 APlusStudent Online Learning
Interactive math lessons with graphics, animation, and audio, based on Micromedia Flash technology. Teacherdesigned, standardsbased lessons. Parents can monitor the progress of their children. There is also homework help and an online gallery where
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 Apples4theteacher.com  Judy Miller
Free interactive early math learning games in JavaScript. Activities reinforce measurement, telling time, shapes, counting, tangrams, and counting money; and some have a specific holiday theme. Counting in Spanish, Polish, and Gaelic also offered.
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 Applet Library (Project Links)  Rensselaer Polytechnic Institute
A library of applets in calculus; linear systems; differential equations; probability and statistics; and advanced math methods. Applets: Balance Applet; Beats; Bicycle Pedal; Bicycle Frame Angle, Frame Force, and Frame Length Analysis; Budget Optimization;
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 Applets for "Random Signals and Noise"  G. Tong Zhou, Georgia Institute of Technology
Eleven Java applets to experiment with: the relative frequency approach to probability; random variables from known distributions; random variables from userdefined distributions; the Central Limit theorem; consistency of the sample mean estimator; select
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 Approximating the area of a unit circle with regular polygons  Lisa Markus; Furman University, Greenville, SC
A Java applet for the area of a circle of radius 1. Enter the number of sides, from 3 to 1000, draw the polygon, and see the corresponding area.
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 AP Statistics  BB&N Upper School
A course from the Buckingham Browne & Nichols School. Advanced Placement Statistics acquaints students with the major concepts and tools for collecting, analyzing, and drawing conclusions from data, featuring work on projects involving the handson
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 APY Calculator
Online calculators that convert annual percentage rate (APR) to annual percentage yield (APY) and vice versa (for certificate of deposit and savings account); and that calculate the real APR of a mortgage with points, origination fees, and closing costs.
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 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;
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 Arcademic Skill Builders
Online educational JavaScript arcade games that teach automaticity and fluency with the four basic arithmetic operations. Single player math games include Meteor Multiplication, Demolition Division, Alien Addition, and Minus Mission. Drag Race (division),
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 Archimedes' Book of Lemmas  Alexander Bogomolny
Archemedes' Book of Lemmas included fifteen propositions. They are listed here, each with its own Java illustration and complete proof.
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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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 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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 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 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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 ArithmaClick  J. D. Brown
Practice addition and multiplication while keeping score.
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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 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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 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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 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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 Arte Matemática  TV Cultura
Introducões, entrevistas, e programas sobre geometria, números, simetria, perspectiva, tempo, espaço, ritmo, beleza, ordem, caos, o número de ouro, Pítagoras, e mais. Com biografías curtas de autores e artistas.
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 The Art of Calculating Real 2D Vectors  Hero van Jindelt
Freeware: Print the text for pupils. Numerical 2Dcalculator. We don't need
words like imaginary, complex number, or Argand Diagram any moresave them
for a history lesson. Ordinary vectorcalculation with a "new" (centuriesold) multiplication,
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 ASCII Shop  ridiculopathy.com
Graphically lay out and format ASCII art. Toggle through standard keyboard symbols, then "paint" them onto the monospace "canvas," and apply effects such as clearing, lightening, darkening, filling, stroking, blurring, and flaring. To capture a textfriendly
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 Asknumbers.com
Online conversions between different measures of length, weight, temperature, pressure, energy, frequency and more.
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 Assignment Calculator  The University of Minnesota
Enter the date you will begin an assignment and its due date, then select a subject area such as mathematics, and the Assignment Calculator will outline steps to take to complete the work on time.
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 ASTEX: A TypeSetting System for the Web  Michael A. Ziegler
A JavaScript application for putting mathematics on the web, including 2D graphs and 3D surfaces. Available under the GNU Lesser General Public License.
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 Asymptopia Software  Charles Cossé
Free math games include TuxMathScrabble, which challenges players to construct compound equations in the manner of Scrabble; Multiplication Station, which provides practice in addition, subtraction, and multiplication; and MakeItTrue, a web application
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