 Convergence  Mathematical Association of America (MAA)
An online magazine encouraging the use of mathematics history as a learning and teaching tool. Convergence will include: math history articles that have a special pedagogical or learning appeal; sharing of classroom experiences; animated mathematical
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 Conversion Program  Lawrence Goetz
A page that uses JavaScript to convert temperature between Fahrenheit and Celsius, length among inches, centimeters, feet, yards, meters, miles, and kilometers; weight among grams, ounces, pounds, and kilograms; and volume among fluid ounces, cups, pints,
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 ConvertAuto.com  Lilly Hammond
JavaScript calclulators for instant online conversions: angles; area; cooking, such as teaspoons (tsp) and quarts (qts); foreign currencies; density; energy; force; frequency; fuel economy, such as miles per gallon (mpg); length; power; pressure; speed;
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 The Converter Site  Alastair Hazell
A user friendly metric and imperial converter tool. Converts length, area,
weight, speed, temperature, time, energy, force, length, mass, power and
currency.
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 Converting Inches to Miles  NASA Lewis Learning Technologies Project
The scale on a road map is 1 inch = 250 miles, how many inches would represent 1250 miles? A detailed answer is provided. From NASA's 9th Grade Math Proficiency Test.
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 Converting Tons to Pounds  NASA Lewis Learning Technologies Project
A loaded moving van weighs 5 tons. How many pounds would 10 loaded moving vans weigh? A detailed answer is provided. From NASA's 9th Grade Math Proficiency Test.
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 Convert It!  Micro Images Internet Services
Conversion tables: enter a number and convert from one unit to another: acceleration, area, energy/work, power, length, mass, metrology, pressure, temperature, volume, U.S. fluid/liquid, and velocity conversions are all possible.
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 Convertme.com  Mariya Voznesenskaya and Sergey Gershtein
Online converter of areas, capacities and volumes, circular measures, computer storage, currencies, distances and lengths, energy and work, fuel consumption, power, pressure, speed, temperatures, time, torque, weights and masses. Convertme.com offers
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 Convex Hull Algorithms  Tim Lambert
An applet that demonstrates some algorithms for computing the convex hull of points in three dimensions. See the points from different viewpoints; see how the Incremental algorithm constructs the hull, face by face; while it's playing, look at it from
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 Cool School Tools  Tim Fahlberg
Shockwave whiteboard movies on algebra, geometry, probability, statistics, the mathematics of finance, and more. A whiteboard movie (WM) is a multimedia screen recording of writing on an electronic whiteboard (real or virtual) with or without voice and/or
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 CopyCat  Jim Morey
A Java game that revolves around replicating a picture created by several patterned faces of a solid object (like a cube), challenging the mind to understand complex geometrical structures and symmetry. To do well at the game, the player must first become
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 CostOfLiving Calculator, Percent Change Calculator  NewsEngin Inc.
The cost of living utility converts dollar values, adjusting for inflation. Find the buying power of dollar amounts dating back to 1957, according to a national U.S. city average, urban regions, or metropolitan areas, as based on the historical Consumer
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 Counting: The Beginning of Mathematics  Interactive Mathematics Miscellany and Puzzles, Alexander Bogomolny
An introduction to and a detailed description of the process of counting, with applets for exploring addition, multiplication, and division.
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 Counting Triangles  Interactive Mathematics Miscellany and Puzzles, Alexander Bogomolny
Division of a square by evenly spaced lines parallel to its sides yields a number of small squares which is clearly square. Interestingly, the same is true for a triangle divided by evenly spaced lines parallel to its sides. The page contains a dynamic
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 Count the Apples  simplyfluid.com
A free online learning tool that uses images of apples to help preschoolers
and kindergarteners learn to count up to 10 by both numbers and words. There are 4 levels of increasing difficulty for sequence and image patterns.
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 CourseServer  Jud Cornish; Fairbanks Country Day School, San Diego, CA
A Webhosted math problem generator that allows you to select from thousands of different problem types and automatically generate problemandanswer worksheets in your browser that can be printed out. Choose from a list of courses from Grade 1 (beginning
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 CPMPTools  CorePlus Mathematics Project (CPMP)
CPMPTools is a suite of both general purpose and custom software tools designed to support student investigation and problem solving in the 2nd edition CorePlus Mathematics texts. The CorePlus Mathematics Program was one of five designated as "exemplary"
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 Create 2D and 3D gnuplot Graphs
Input a function, vary parameters, plot 2D, 3D Surface, or 3D Contour, vary range displayed, and plot multiple functions at once. With help on various features, and links to graphing animated plots and varying the parameters. Part of the Shodor Educational
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 Create a Graph  National Center for Education Statistics (NCES)
Create your own graphs online: bar graphs, line graphs, area graphs, pie charts, or XY graphs (line, bubble, or scatter plots from Cartesian coordinates). Enter your own data, choose your own labels, preview your work, then print or save your graphs.
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 Creative Java Puzzles  J. L. Read, Enchanted Mind
Games "good for exercising both sides of the brain." Knight's Tour: pass all the squares of the board with the knight, making only legal moves. Peg Solitaire: Remove all the pegs in the least amount of time, finishing with only one peg in the target hole.
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 CROC'Sciences: le net.magazine de la pédagogie des sciences  P. Lambert
Un mensuel faisant le tour des sites scientifiques d'intérêt
pédagogique, soit pour la construction d'un cours, soit pour les
élèves euxmêmes. Chaque numéro comporte 6
catégories: Mathématiques,
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 Crossnumber puzzle (figure logic)  Alfredo Baratta
Cross figure puzzles to print or play online. Also known as figure logic puzzles, cross figure puzzles resemble crosswords in structure, but with entries consisting of numbers rather than words, and clues based on math questions, e.g., "1 Across: The
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 Cross Number Puzzles  Rainer Typke
Cross number puzzles to solve online; log in to create your own. Also known as crossfigure, figure logic, or numberlock puzzles, cross number puzzles require numbers instead of words to complete a crosswordlike grid.
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 Cryptarithmetic Puzzle Solver  Naoyuki Tamura
Enter a cryptarithm or select an example, such as SEND + MORE = MONEY. Also, puzzle generators based on themes such as color names, fruits, vegetables, and numeral words in English, French, German, Spanish, and Italian.
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 Cryptarithms  Interactive Mathematics Miscellany and Puzzles, Alexander Bogomolny
Cryptarithms are brain teasers obtained when digits in numerical calculations have been replaced by letters. Customarily, distinct letters stand for different digits. Another term, Alphametics, denotes cryptarithms in which letters form meaningful words,
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 Crystals: Crystallography & Systems  Suzanne Alejandre
A Math Forum Web Unit. Students studying polyhedra enjoy seeing the structures as they occur in the real world. Crystalline structures can be categorized into seven crystal systems: see photographs of beautiful crystals or make paper models of crystals
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 CTAP Middle School Math Project  CTAP Region IV
A database of online technology resources supporting California middle school math content standards for grades 6, 7, and algebra. Designed for use in classroom instruction or as homework helpers for students, the matrices resources align to state standards
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 CTK Math Games for Kids  Interactive Math Miscellany and Puzzles, Alexander Bogomolny
This site presents a collection of Javabased interactive games and puzzles with mathematical contents and a few practice exercises disguised as games. Alexander Bogomolny, the site's author, writes, "There are a few games whose purpose is to allow for
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 Cube Roll  Cary and Michael Huang
Use the arrow keys to steer a cube along a path of squares towards a final square. Each successive level poses new restrictions based on which faces of the block can or cannot roll onto the square path, making a game out spatial thinking of polyhedral
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 Culturally Situated Design Tools: Teaching Math through Culture  Ron Eglash
Java for creating your own Mangbetu design, cornrow curves, graffiti, bead looms, SimShoBan, Yupik star navigator, Yupik parka patterns, PreColumbian pyramids, and rhythm wheels  and learning the mathematics behind them. Organized into African, African
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 Curriculum Pathways  SAS inSchool
Internetbased product that connects teachers to a broad range of curriculum resources and clarifies ways to use those resources in the classroom. Find lesson plans and links to Web sites in math, science, English, and social studies; access national
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 Curry's Paradox  Interactive Mathematics Miscellany and Puzzles, Alexander Bogomolny
A bewildering dissection paradox wherein recombination of 4 pieces cut of a rectangle produces a rectangle of a different size. Borders geometry and algebra. Accompanied by a Java illustration.
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 Cyberkidz  Chato BV, touchscreensoftware.nl
A free website with more than 50 games about math, literacy and geography. In English and Dutch.
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 Cyberkidz.net  Chato BV
Online educational games for primary schools, widely used in the Netherlands and recently translated into English.
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 Cybermath  Gustav Taxén, Ambjörn Naeve, Olle Sundblad, Pär Bäckström and Sören Lenman
An avatarbased collaborative virtual exploratory environment for math. Trial version for Windows is available free.
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 Cyberpapy  Boulanger
Posez votres questions des devoirs dans les forums; des "cyberpapys" répondent.
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 CyberStats  CyberGnostics, Inc.
A complete online introductory statistics course, including: a focus on data analysis and conceptual understanding rather than computation; over 600 interactive applets; real data in realworld settings; a builtin, simple, and free course management
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 CyMath
Stepbystep typeset results in differential calculus, integral calculus, algebra, and trigonometry. Just key in your expression or equation — or modify one of CyMath's examples — then select from among eight actions in the pulldown menu:
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 Dadaviz  León Markovitz and Jishai Evers
Interactive data visualization curated from thirdparty sources. Infographics, which date back to April, 2014, have included "GDP per Continent & Country," "The major causes of death in the 20th Century," "4_21 Polytope Visualized," "The Changing Arctic,"
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 Daeron's Java  Daeron Meyer
Numerous applets, created by a former technician at the Geometry Center, can be enjoyed here if you have a Java enabled browser. Mathrelated creations include a 3D viewer; Real time function graph; Rotating Red Triangle; Circle Text; and links to other
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 Daily Squares  Steven Pomeroy
Arrange the digits in the 4×4 grid so that each column, row, and diagonal adds up to 34. Visit every day for a new magic square puzzle; check the archive for past challenges. For more "cool math tricks, math games, and interesting mathematical concepts,"
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 Daniel J. Velleman  Daniel J. Velleman, Department of Mathematics and Computer Science, Amherst College
In addition to Velleman's selected papers, link to his books, software, and unpublished papers, including Proof Designer, a Java applet designed to help students learn to write proofs in elementary set theory by outlining the steps of proofs under the
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 Daniel Lemire's homepage  Daniel Lemire
Daniel Lemire is a researcher in wavelet theory, data thinning and subdivision schemes. Recently, he has been interested in applications of these mathematical tools to ebusiness and data mining. Site contains papers (downloadable, PDF format), software
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 d'Arbeloff Interactive Math Project  Massachusetts Institute of Technology
Java applets, with help documentation, for exploration: Amplitude and Phase, Beats, Complex Exponential, Complex Roots, Convolution (accumulation or flip and drag), Damped Vibration, Damping Ratio, Euler's Method, Forced Damped Vibration, Fourier Coefficients,
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 DareWare: Educational, Multimedia and Java Games
Educational games and multimedia products (free demo versions downloadable), Java games, "This Week in U.S. History", and a brief list of other shareware sites.
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 Data Games  KCP Technologies
As students play Data Games, they generate data that they must analyze to win the games. Supporting materials include a student worksheet; teacher guidelines that correlate the activity to the Common Core State Standards for Mathematics (CCSSM); and videos
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 Dave's Geometric Pix Gallery  David Joyce; Dept. of Mathematics & Computer Science, Clark University
Mandelbrot and Julia sets, with a generation form and an Explorer on which you can point and click to get more refined images;
Newton Basins and a form to generate them; a page describing tiling the hyperbolic plane; some wallpaper groups; a gallery
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 Davitily Math Problem Generator  Nguyen, Ly; and Pardue, David
Create worksheets and tests, including options for multiple choice, printable versions, and answer keys. Click to insert preworded questions in basic math, algebra, and geometry, the parameters of which vary randomly. Requires JavaScript. Also available
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 Deal or No Deal > Game  NBC
A Flash version of the television game show hosted by Howie Mandel. Begin by choosing one of 26 briefcases. Each contains cash  as little as one cent to as much as one million dollars. Then either stay with your original briefcase choice or make a "deal"
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 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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