 Decimal Places on a Number Line  NASA Lewis Learning Technologies Project
Decimal places: On a number line, which of the following numbers would be the farthest to the right? 0.001, 0.0015, 0.00099, 0.0005. A detailed answer is provided. From NASA's 9th Grade Math Proficiency Test.
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 Deckulator  Michael B. Moore
For your collectible trading card games, especially Magic: the Gathering. Deckulator calculates the percentage that a card combination will occur in the first cards dealt off the top of the deck. The calculator uses multivariate hypergeometric distribution.
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 Demography: the Java Version  Daniel Udovic, Joshua Coxwell
Java Demography 2.0.2 simulates growth in age structured populations. The program's click and drag features allow users to directly manipulate the fertility and mortality graphs and the population's current age distribution, represented as a bar chart
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 Demos with Positive Impact  David R. Hill and Lila F. Roberts
Demos with Positive Impact organizes effective math teaching tools. Submit your own demo, or browse the existing collection of physical demos, calculator demos, databased demos, browserbased demos, and software demos, each with statements of objectives,
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 Demos with Positive Impact  David R. Hill and Lila F. Roberts
A collection of classroom demonstrations that use some form of instructional technology. The authors invite others to submit demos and provide them with feedback on the demos already collected. Demos are organized under the levels of Pre Calculus, Calculus
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 Department of Mathematical Sciences  U.S. Military Academy, West Point
Publications include Cryptologia, CASE (Computer Algebra Systems in Education), Mathematica Militaris, and PRIMUS (Problems, Resource, and Issues in Undergraduate Mathematics Studies). MathTECH is a research project that provides Java applets and TI89
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 Derivative Calculator  David Scherfgen
Compute derivatives of functions online, for free. Supporting symbolic computation of the 1st, 2nd, and subsequent derivatives of multivariable functions, the Derivative Calculator dynamically typesets expressions while you type them. derivativecalculator.net
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 The Derivative Project: Using Appropriate Technology to Teach the Concept of Derivative Via a Graphical Approach  Lisa Denise Murphy
Murphy has developed an instructional unit that uses a motion sensor and related software to introduce the concept of a derivative, and tested it in a firstsemester calculus class, with very good results. She is now engaged in expanding this project
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 Descartes 3  Ministry of Education, Culture, and Sport, Spain
Create interactive math lessons in web page format with this applet, or download any of more than 60 already created applets (ranging from "representing numbers on a straight line" to "tables and algebraic terms," from "geometry and a game of billiards"
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 Design Science  Design Science, Inc.
Math publishing and presentation tools for the web: MathType, the professional version of Equation Editor, for Windows or Mac; WebEQ, for building interactive math web pages; MathFlow, math publishing for the enterprise; and MathPlayer, to display MathML
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 Design Your Future  Math, Science, and Technology for Girls  Autodesk, Inc.
The Design Your Future mission is to provide practical, inspiring, hands
on opportunities for young women to become aware of, explore, and pursue
math, science, and technologybased careers. It provides a number of opportunities, including: a tool
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 Desmos  Desmos Inc
This free online graphing calculator zooms in and out of plots, offers slider bars to explore parameters, switches between Cartesian and polar coordinates, and more. Save sketches, mark points of interest, turn on "projector mode" for thicker, darker
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 Des Trucs et des Maths  Philippe Picart
Sur le nombre pi; le nombre d'or; le Rubik's cube; des ressources à télécharger; et "des trucs de maths divers," comme un JavaScript qui répond à la question "Quel jour de la semaine estu né?" Avec un coins des
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 DevApprentice: Software Developer Apprentice  Kent Griffin
An online resource for learning elementary computer programming. Write and execute real programs, including graphics, in your web browser. Includes a programming problem of the week, examples, instructions, a glossary, and the online programming environment.
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 developer.com's collection of math Java applets  EarthWeb, Inc.
A browsable, searchable collection of links, authors, notes, and details about Java applets contributed to developer.com. Software is organized into the categories of basics and children's, fractals, games and puzzles, general, geometry, plotting, graphing,
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 The Diamond Theorem  Steven H. Cullinane
Finite projective geometry explains the surprising symmetry properties of some simple graphic designs  found, for instance, in quilts. Links are provided for applications to sporadic simple groups (via the "Miracle Octad Generator" of R. T. Curtis),
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 A Dice Game  Doug Ensley, Shippensburg University
In this game, two players roll dice repeatedly taking note of who has the higher roll each time. The original number of dice for each person and the number of rolls are set by the user. At the end, the percentage of wins for each player is displayed.
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 Digital Deletions  Pierre Ysewijn
An interactive JavaScript version of Conway's Digital Deletions game, in which numbers in a string are lowered to zero or erased. Users can play with different numbers of digits, different strategy levels, different starters, different sources of digits
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 Discovering Polygons and Polyhedra  Paul Scott; applets by Bob Allanson
To encourage exploration of polygons and polyhedra in an interactive way, and to appreciate their
beauty. The site contains many diagrams and applets, and invites readers to explore and find
answers for themselves.
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 Discriminant Exponent Calculator  John Jones
A Java applet for computing the maximum exponent of a prime in the discriminant of a number field of given degree. Enter values for the degree and the prime, and hit the Compute button.
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 Distance Calculator Between Cities  Dan Gallagher
Enter two cities or countries and this CGI illustrates them on a scaled political map, calculates the distance between the two locations in miles and kilometers, and provides information about latitude, longitude, bearing, and airports. All latitude and
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 Distances on the surface of a cubical box  Henry Bottomley
An applet that demonstrates distances across the surface of a rectangular box. The first three boxes are the dimensions of the cuboid. To change them, type new numbers in and then press the "You choose" button. The text box offers six almost selfexplanatory
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 Distributed Maple  Wolfgang Schreiner; RISCLinz, Johannes Kepler Universität Linz
A system for writing parallel programs in the computer algebra system Maple, so that different computers in a network can perform parts of the same computation. The program may be downloaded here in .tar or .zip form. The manual, a README file, and papers
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 Divide!  Andrew Starr
A web page used to demonstrate that if you divide any two integers, eventually the decimals will repeat.
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 Dividing 12foot Boards  NASA Lewis Learning Technologies Project
Lewis needs 1,500 boards to build a small rocket. Each board must be 3 feet long. If boards are sold in 12 foot lengths, how many boards must Lewis buy and cut into 3 foot pieces to get the 1,500 he needs? A detailed answer is provided. From NASA's 9th
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 Dividing Decimals  NASA Lewis Learning Technologies Project
Dividing decimals: What is 12.8 divided by .04? A detailed answer is provided. From NASA's 9th Grade Math Proficiency Test.
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 Dividing: Fractions and Mixed Numbers  NASA Lewis Learning Technologies Project
What is 1 1/2 divided by 1/2? A detailed answer is provided. From NASA's 9th Grade Math Proficiency Test.
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 Division by Zero  Dave Richeson
A blog about "math, puzzles, teaching, and academic technology." Posts, which date back to September of 2008 and sometimes introduce original applets, have included "Volumes of ndimensional balls," "Albrecht Dürer's ruler and compass constructions,"
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 Divisor Plot  Jeffrey Ventrella
"We hear of primes described as the 'building blocks' of all numbers. Let's turn that concept on [its] head. Instead, let's think of primes as the negative spaces behind complex objects. Imagine a series of picket fences stacked in front of each other.
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 The Doctor X Amazing Griddable Multiplication Contraption  Gordon Anderson
Click a color from the left of this 10×10 JavaScript array, then paint the grey boxes with it to illustrate how rectangular area, multiplication, and the distributive property interrelate. As products color the grid, the column on the left dynamically
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 Don Hatch's Home Page  Don Hatch
Hyperbolic tessellations shown in various stages of truncation, and represented by their Schlafli symbols. Java applets explore hyperbolic tessellations, a magic Rubik'slike cube in four dimensions, polygon reciprocation (dual), modern portfolio theory
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 Doodal  Neil Thapen
Draw fractals freehand using a computer mouse: select a "brush size" to specify width in pixels, then click and drag in the large orange frame, the contents of which get copied in however many blue frames you specify. To rotate a blue box, click it while
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 Doodling and Miracles  Cut the Knot!, Alexander Bogomolny
Almost 100 years ago, Frank Morley proved a curious theorem from elementary geometry that had remained unknown until 1899. With time, the theorem became known in mathematical folklore as Morley's Miracle (Morley's Trisector Theorem is a more mundane term.)
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 Dot Patterns and Sierpinski Gasket  Cut the Knot!, Alexander Bogomolny
How many ways are there to define the Sierpinski gasket (also, the Sierpinski triangle)? The author has counted a respectable 9 but would be happy to learn of more. An applet with rows of digits or circles with colors corresponding to the digits shows
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 Double Division  Jeff Wilson
Double Division is a method for doing manual division that reinforces the principles of division and gives students success with a less frustrating alternative. The online calculator shows and explains each step. Feedback from teachers who've used the
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 Do You Know That...  Interactive Mathematics Miscellany and Puzzles, Alexander Bogomolny
A collection of short essays about over 60 curious mathematical facts and terminology, mostly linked to explanatory or exploratory essays, drawn from various parts of Bogomolny's site, CuttheKnot. See page two and page three.
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 DreamBox  DreamBox Learning, Inc.
Online, standardsbased math adventure games for individualized learning in kindergarten, 1st grade, and 2nd grade. Seealesson and register a trial account. The site also offers parents free "printables," tips, research articles, and other downloads,
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 Dream Frequency .com
CGI web applications to calculate the factors of a number, calculate the prime numbers below a number, test a number for primality, calculate a word's position in the alphabetically sorted list, convert hex to ASCII, or convert temperature from celsius
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 The Drills To Play  Cut the Knot!, Alexander Bogomolny
An exploration of a detail found at the beginning of Kurt Godel's biography by John Dawson, how repetition and practice constitute an integral and necessary part of the learning process; that, by implication, one first conceives an idea, then proves it
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 Drunkard Walk  Vladimir Gusev
An applet illustrating the onedimensional drunkard walk algorithm, which describes the process of molecular diffusion in an equilibrium gas.
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 Dynamic Web Tools Using webMathematica  Steve Wilson and Mike Martin, Johnson County Community College, Kansas
Interactive Web pages that allow students and faculty to compute and visualize mathematical results directly from a Web browser. Primarily for undergraduate courses, the pages are grouped by categories and a given page may be listed under several categories
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 Earning 5.5 Percent Interest  NASA Lewis Learning Technologies Project
Mareta put $4,000.00 in a savings account at an annual interest rate of 5.5%. How much interest will the principal earn in 1 year? A detailed answer is provided. From NASA's 9th Grade Math Proficiency Test.
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 Easy Calci  Manoj Prabhakar
Calculators for linear algebra, statistics, length conversions and other measurements, interest and other financial topics, and more.
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 EasyCalculation.com
Free online mathematics converter, calculators, and other tools for numbers, unit conversions, hexa conversions, decimal conversions, binary conversions, area, trigonometry, analytical geometry, algebra (e.g., group work, Bernoulli inequality, Venn diagrams
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 EASYpEXPR: Writing Expressions in Pure HTML  Giovanni Artico
Enter an expression in the textbox, and the page will return the HTML code that would show the expression in standard visual form.
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 Echecs & Math: Jeux, Exercices et Méthodes  Bernard Faujour
Java et JavaScript pour apprendre la géométrie des tangrams et des polyominoes. Les problèmes incluent questions de logique, et textes et tableaux. Les ressources incluent jeux pour télécharger, et une fabrique d'exercices
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 Economic and Game Theory  David K. Levine, Department of Economics, UCLA
A site that uses the tools of modern economic theory and game theory to explore how the interaction of intelligent goalseeking individuals determines social outcomes. The site offers general interest material, undergraduate and graduate course material,
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 Ed Tech Tools  University of Hawaii
Free, webbased tools for educators, featuring QuizMaker 2.0, which allows users to create and correct online quizzes easily and quickly, without any knowledge of HTML. It provides instant feedback to students, and/or package answers in an email that
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 Educational Interests  Keith Lynn
See, in particular, Lynn's Math Modeling Project, which features Java applets to produce quadratic and sine examples; and Dynamics Project, on the Julia and Mandelbrot sets.
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 Educational Resources  Avraham Goldstein
CGI for solving quadratic and cubic equations, performing polynomial division with remainder, finding real and complex roots of cubic equations, and analyzing polynomial functions (determining first and second derivatives, local maxima, minima, inflection
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