 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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 Automated Deduction  William McCune
Research on applications of automated deduction to problems in abstract algebra and algebraic geometry, algorithms and strategies for searching for proofs and for counterexamples, highperformance implementation of automated deduction algorithms, and
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 Automated Geometry Java Applet Generation  Saltire Software
Prototype automatic generation of Java Applets from a constraintbased geometry description. Examples: geometry applets (angles on a chord, similar triangles, angles between parallel lines, two right kites, perpendicular bisectors of a right triangle,
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 Automaths: Online Maths Activities for Kids  Education by Design, UK
A Java applet with three different levels to practice for automatic response skills, suitable for children of all ages. Use the levels to customise: Junior challenges addition and subtraction skills; middle provides problems using addition, subtraction
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 Automatic Calculus Solutions: StepbyStep Derivatives and Integrals
Derivatives and integrals, done automatically with each step explained. Long multiplication and division of polynomials.
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 Averaging Diving Scores  NASA Lewis Learning Technologies Project
Kim received the following scores in the state diving championships: 5.2, 5.6, 4.5, 5.0, and 5.2 What was her average (mean) score? A detailed answer is provided. From NASA's 9th Grade Math Proficiency Test.
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 The Awari Oracle  John Romein
Play the ancient African "count and capture" strategy board game, related to mancala, and also known as wari, awale, oware, or ayo. Dutch computer scientists from Amsterdam's Vrije Universiteit developed a program that computes the best move and eventual
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 Bagatrix Mathematical Software  Bagatrix Solutions, Ltd.
Commercial software that features stepbystep solutions to userentered problems, with prompting. Titles include: Solved! Studio (comprises Basic Math, PreAlgebra, and Algebra titles), Algebra Solved!, PreAlgebra Solved!, Basic Math Solved!, Graphing
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 Bar Chart Applet  Robert Scott Mitchell
Enter values for the ten bars; control their orientation, and the scale of the chart at runtime.
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 Barcode Encoding  Interactive Mathematics Miscellany and Puzzles, Alexander Bogomolny
Barcodes are used with various encodings all over the world to simplify product identification, especially in retail. The site explains the most popular encodings, like UPC (Universal Product Code), ISBN (Intenational Standard Book Number), and EAN13
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 Barry G. Adams
Barry Adams is a professor of mathematics and computer science at Laurentian University in Ontario, Canada. His website includes many Java applets, including elementary numerical methods (i.e. Newton's Method), various examples of chaotic attractors,
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 Baseball Heat Maps  Jeff and Darrell Zimmerman
Heat maps, Loess curves, Pitch F/X and Retrosheet downloads: actual vs expected home runs; home run and fly ball distance leaders; total batted ball distance; ground ball and line drive pull percentages; batter swinging or looking strike zone; batter
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 BaseballSavant.com  Daren Willman
Daily feeds of Major League Baseball (MLB) player matchups and advanced statistics on those players. See, in particular, Willman's Instant Replay Database, which analyzes umpire reviews and manager challenges of fair or foul in outfield, fan interference,
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 Base Conversion Routine  David Cronin
This is a Javascript base conversion program for bases 2 through 36. The author writes: "Feel free to make use of it. It's limited only by the precision of enviroment runtime."
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 Base Converter  Interactive Mathematics Miscellany and Puzzles, Alexander Bogomolny
A fairly highlevel introduction to binary and other base systems, with a Java converter and links to related pages including: arithmetic operations in various bases, algorithmic conversion procedure, linguistic fun with base 36, Napier bones, abacus,
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 Base Ten Block Activities  Margo Lynn Mankus
Manipulate a Base 10 Block Applet developed by Jacobo Bulaevsky to explore whole decimal numbers with blocks. There are printable examples of pattern blocks, graph paper, rods, and color tiles, and activities designed to make connections between the use
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 Basics of Computational Number Theory  Robert Campbell
An introduction to computational number theory, beginning with a quick overview of arithmetic in the modular integers. Throughout, the paper emphasizes computation and practical results rather than delving into the why. Simple programs, generally in JavaScript,
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 BasketMath Interactive  Robert Cummings, Science Academy Software
Science Academy Software's BasketMath online interactive application drill and practice site offers autoscoring questions in arithmetic, rounding and writing numbers, order of operations, factoring, adding or multiplying signed numbers, calculating perimeter
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 A B Cron Portal  Auston B. Cron
GeoGebra applets by a teacher who has taught high school and early college students since 1970, and uses his dynamic geometry animations and interactive sketches in his classes to teach angle sums; perimeters and areas of rectangles and squares; reference
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 Berrie's Statistics Page  Berrie Zielman
Statistical concepts illustrated using small QuickTime movies. Topics include: Interactive graph of the central limit theorem; normal approximation of the binomial distribution; Poisson distribution; Mean and Variance in the Normal Distribution; Graph
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 Between Arithmetic and Algebra  Cut the Knot!, Alexander Bogomolny
What is the difference between the arithmetic 3+5 = 5+3 and the algebraic a+b = b+c? One is a specific fact, another is a pattern valid in a multitude of situations. While arithmetic may hint at some regularities, algebra, as a language, gives expression
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 Between Arithmetic and Algebra  Cut the Knot!, Alexander Bogomolny
What is the difference between the arithmetic 3 + 5 = 5 + 3 and the algebraic a + b = b + c? One is a specific fact, another is a pattern valid in a multitude of situations. While arithmetic may hint at some regularities, algebra, as a language, gives
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 Between the Folds  Corporation for Public Broadcasting
Exploring the science, art, creativity, and ingenuity of origami, Between the Folds chronicles the stories of ten leading paperfolders and their works of art. The game "Match the Folds" presents three finished works of origami alongside the fold pattern
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 Big Integers in JavaScript  Leemon Baird
A JavaScript library for arbitraryprecision integers. This page performs RSA in any base: binary, decimal, hexadecimal, base 64, and base 95 (whole keyboard), in which the message can be ordinary text. The library allows addition, subtraction, multiplication,
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 The Big Mac index  The Economist Newspaper Limited
The Economist's lighthearted guide to currency alignment based on the theory of purchasingpower parity (PPP). Never intended as a precise gauge of currency misalignment, "Burgernomics" has made exchangerate theory "more digestible" since 1986. Mouse
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 The Billion Prices Project  Roberto Rigobon and Alberto Cavallo, Sloan School of Management, Massachusetts Institute of Technology
The Billion Prices Project monitors the daily price fluctuations of millions of items sold by hundreds of online retailers in more than 70 countries. The Billion Prices Project (BPP) then uses those data to conduct economic research into pricing and sales
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 BinaryTranslator.com
Translate text to binary and vice versa, and similarly convert between binary and decimal.
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 The Birthday Problem (MSTE)  George Reese; University of Illinois at UrbanaChampaign (UIUC)
This activity discusses the probability that there will be at least two matching birthdays in a small group of people. It includes an online program that creates a set of dates at random. Introduction, simulation, questions, an explanation, and a note
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 Bisection Method Tutorial  Joseph L. Zachary
A tutorial that explores the bisection method for finding the roots of equations. Includes a Java applet that opens in a separate window, for use alongside the tutorial. From a Computer Science course at the University of Utah, and the book Introduction
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 BIT101 Lab  Keith Peters
Launch BIT101 Lab to browse Peters' repository of experimental Flash files, many interactive, dating back to 2001. He also provides tutorials on using Flash to simulate gravity, easing, elasticity, perspective, 3D rotation, and "the various little creatures
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 BitArt  Robert J. Krawczyk
Illustrated introductions to spirolaterals and strange attractors. See a selfrunning demonstration of a variety of spirolaterals, or generate one of your own and see all the reversals. The link of current exhibits lists installations showing strange
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 Black Saturn Mandelbrot Set Explorer  Kokoska
Very high, high, and low resolution Java applets for zooming in on smaller and smaller areas and discovering the hidden complexities of the Mandelbrot set.
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 Blended Learning and Teaching with Animation  Dr S. M. Hajsadr
Algebra lessons online. Free registration required. From the site: Electronic lessons are animated learning material which deliver classroom or tutor like teachings. They are developed following the strict guidelines drawn from many years of research.
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 Blogic  J. David Velleman, Dept. of Philosophy, Univ. of Michigan
An interactive textbook in logic. Topics and interactive software include: Boolean searching; logic circuits; truthtables; Turing machines; foundations of probability; modal logic with possibleworlds diagrams; quantification. Includes interactive
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 Bob's Pages  Bob Allanson
A collection of geometry applets. Generate and modify polyhedra, investigate the Mandelbrot and Julia sets, or experiment with Pappus's arbelos, the porisms of Poncelet and Steiner, and a logarithmic spiral.
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 Body Surface Area Calculator  Evelio PerezAlbuerne
Calculate the surface area of your body (in square meters) from height and mass.
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 bontegames  Bart Bonte
Logic and physics Flash challenges from the independent game designer behind "factory balls" and "sugar, sugar": a blocky christmas, furiosity, 40xEscape, farafalla, 14 locks, and more.
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 Bottles in a Wine Rack  Interactive Mathematics Miscellany and Puzzles, Alexander Bogomolny
Arranging wine bottles in a rack leads, under certain circumstances, to a curious mathematical problem discussed in books by S. Wagon and R. Honsberger. The site arouse out of an attempt to illustrate their solution. The dynamic illustration quickly
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 BrainBashers  Kevin N. Stone
A collection of logic, language and math puzzles, in a choice of easy/medium/hard. Rate the puzzles; show their answers. Logic puzzles include Einstein's Puzzle. Play games of strategy, such as "Four in a Row" (also known as "Connect Four") or games based
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 BrainBashers  Kevin Stone
Five math or logic challenges on a page, each with clickable hints and solutions. For games, visit http://www.brainbashersgames.com/.
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 Brain Food  Puzzles For the Brain To Gnaw On  Samuel Stoddard
Hundreds of online (CGI) puzzles, including logic puzzles, word problems, number puzzles, lateral thinking puzzles, scrambled equations, cryptograms, loginumber puzzles, discrete reasoning puzzles, mathematical reasoning puzzles, knight's dilemma, magic
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 Brainormous
Worksheet makers and math games available for demo or purchase: Zeus' Petals, Fourdoku, Multiflyer, Mathteroid, Gridiant, and more.
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 BrainPOP Math  BrainPOP, LLC
Short animated films that are simple and easy to understand on elementary mathematics, as well as health, science, and technology. Films often accompanied by quizzes.
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 Brainwave  Wognum Art
Ten visual puzzles, to test your visual and reasoning skills. Most have to do with symmetry recognition. There is a "top 5% brain" award to those who earn ten "smart bulbs."
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 Breaking Chocolate Bars  Cut the Knot!, Alexander Bogomolny
The chocolate bar puzzle has three parameters: two side lengths (m and n) and actual selection of lines along which to break the bar and its parts... An interactive column for MAA Online that uses a Java applet to simulate a puzzle or mathematical problem,
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 Bret Victor
From the creator of Kill Math, Victor's "umbrella project for techniques that enable people to model and solve meaningful problems of quantity using concrete representations and intuitionguided exploration" in pursuit of a "widelyusable, insightgenerating
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 Brighten's Fractals Page  Brighten Godfrey
Investigate "Just Another Fractal Generator," a Java applet to make Iterated Function System (IFS) fractals based on triangles, or view a gallery of images created using the program.
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 A Broken Calculator  Cut the Knot!, Alexander Bogomolny
Thoughts on the controversial question of using calculators in the classroom, and the author's belief that even a broken calculator may have its uses: the elementary mathematics curriculum may emphasize any or all of the paperandpencil, mental, or technologybased
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 Brownian Motion  Charlie Geyer
An applet that draws onedimensional Brownian motion, with source code and a link to statistical Java applets by others.
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 BTU Calculator  HearthNet
A calculator that estimates the heating needs of a room, a combination of rooms, or an entire home. Enter the length and width of the area to be heated and select the climate and insulation factors from the popup boxes. A Java version of this calculator
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