 World of Escher  World of Escher, Inc.
The world of M. C. Escher (18981972), the famous Dutch graphic artist most recognized for spatial illusions, impossible buildings, repeating geometric patterns (tessellations), and his incredible techniques in woodcutting and lithography. This site offers
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 World of Fractals  Adam Lerer
A general site about fractals, including image galleries, animations, descriptions of different types of animations, explanations, programs to download, and related links. See Types of fractals; read Understanding Fractals (The Basics, The Mathematics,
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 The World of Geometric Toy  Akira Nishihara
Play with animations and applets of Buckminster Fuller's Tensegrity and the Indian Ball (also known as the flexisphere), as well as wireframe renderings of the torus, the magic ring, the toroflux, the reversible polyhedron, and other objects. Nishihira
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 World of Teaching
Free Microsoft PowerPoint and whiteboard presentations for teachers. In particular, browse or contribute to the maths downloads. Formerly teacherpowerpoints.com.
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 The World of Trotter Math  Terry Trotter, Escuela Americana, San Salvador, El Salvador
A page of problems, problem sheets, and investigations, with links to image files of an inclass math newsletter, Trotter Math News. Of particular interest to the author are numbers: happy and dizzy numbers; palindromes; super squares; perfect, amicable,
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 World of Words, Numbers, and Notes  Mike Keith
Mostly original diversions in the areas of mathematics, word play, and music, including a Cadaeic Cadenza, a long pi mnemonic. Also, Ailihphilia (literature and word play) and Scitamatics (mathematical diversions): the recreational study of words, numbers
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 Worldometers.info
Counters that display the realtime data on world population (e.g., births this year, births today, deaths this year, deaths today, net population growth for today), government and economics (daily government expenditures toward health care, education,
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 World Population and Four Dice (Math Chat)  Frank Morgan; Christian Science Monitor
Answers to the old challenge (Estimate what fraction of the people who have ever lived on Earth are alive on Earth today.) plus a new challenge and an additional problem and answer (courtesy S. H. Logue: Ann learned that her old dotmatrix printer can
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 World Population Counter  David Levine
A site that gives the world's population at the time of page access and at a time in the past or the future. If you wish to include the counter in one of your pages, instructions are included. Also includes clientpull for continuous updating of the global
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 World's Fastest Man  Ivars Peterson (MathTrek)
The 1998 edition of The Guinness Book of World Records features an article about Donovan Bailey, billed as the fastest man alive. The article begins: "Canadian Donovan Bailey rocketed into the record books when he set a new world mark of 9.84 seconds
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 World Time Zone  iSBiSTER International, Inc.
The exact time in world countries from Afghanistan to Zimbabwe, including, individually, the United States and the Canadian provinces. A software Time Zone Map program that does not require an active connection to the Internet is also available from this
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 Worldwide Center of Mathematics  David B. Massey
The videotextbooks Worldwide Differential Calculus and Worldwide Integral Calculus with Infinite Series feature linked crossreferences, popup margin comments, interactive graphs, and relevant teaching videos embedded directly within its chapters. The
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 World Wide Mathematics Tutor  ThinkQuest 1996
Fractions, with a bit about decimals: vocabulary, problems and solutions; adding and subtracting fractions and mixed numbers.
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 The World Wide Web and Pedagogy  Mathematics Education at The Math Forum
Examples of the hypertextual, hypermedia, communications capabilities of the Web in education: articles, courses, conferences, and model Web units.
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 World Wide Web Course Tools  WebCT
WebCT can be used to create entire online courses, or to publish materials that will supplement existing courses. It uses WWW browsers as the interface for the coursebuilding environment; other than the browser, there is no special software to install.
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 WorldWideWeb for Operations Research and Management Science (WORMS)  Moshe Sniedovich; Dept. of Mathematics & Statistics, Univ. of Melbourne
A grassroots WWW site established by the Operations Research Group (ORG) at the Department of Mathematics, The University of Melbourne, Melbourne, Australia. WORMS' main objective is to complement the formal online activities of OR/MS Societies worldwide.
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 World Year of Physics 2005
The World Year of Physics 2005 is a United Nations endorsed, international celebration of physics. Events throughout the year highlighted the vitality of physics and its importance in the coming millennium, and commemorated the pioneering contributions
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 Would You Rather?  John Stevens
Choose between the two apparently equivalent choices — and justify your selection with reasoning: "Would you rather ... run the circumference of the circle OR perimeter of the rectangle? be given 100 grams of new nickels OR 220 grams of new dimes?
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 Wright Flyer Teachers' Lounge  National Aeronautics and Space Administration
Lesson plans include Wind Tunnel Data (lift and drag); Know all the Angles (does pitch affect lift?); Watch Your Altitude (the three axes of rotation and the movements of roll, pitch, and yaw); Getting the Wright Pitch; and Up, Up and Away (compare the
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 Write Math with the Math Forum  Math Forum
A standardsaligned, gradespecific program to improve math problem solving. Engaging problems adapted from the Problems of the Week program have been correlated to state standards, math topics, and widelyused textbooks. A trial membership gives you
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 Writing a Math Phase Two Paper  Steven L. Kleiman, with Glenn P. Tesler; MIT
A discussion of the kind of writing appropriate in a paper submitted to the math department to complete Phase Two of MIT's writing requirement: a review of the general purpose of the requirement and the specific way of completing it for the math department;
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 Writing Assignments in Calculus  Tommy Ratliff; Dept. of Mathematics & Statistics, Wheaton College, Norton, MA
Imaginative paper proposals for SingleVariable and Multivariable Calculus courses cover subjects from "Confusion in Beverly Hills" (geometry, trigonometry) to "The XFiles Makes Me So Angry" (optimization of a function of two variables)  and many more.
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 Writing for a Math Class  B. Sidney Smith, Wendy Hageman Smith; Math Academy Online/Platonic Realms
A "minitext" concerning written communication in mathematics classes, for both students and teachers. Teachers' section discusses possible formats and assessment, and gives sample lessons; students' section gives practical tips on approaching a written
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 Writing in Mathematics  Dr. Annalisa Crannell; Franklin & Marshall College
Dr. Crannell's Guide to Writing in Mathematics, the checklist she uses, and writing assignments from her PreCalculus and Calculus I, II, and III classes. Contents include: Why Should You Have To Write Papers In A Math Class?; How is Mathematical Writing
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 Writing Math (Learning and Mathematics)  Joan Countryman; Math Forum
In her 1993 book Writing to Learn Mathematics, Joan Countryman, the Head of Lincoln School in Providence, Rhode Island, explores the relation between math and writing and provides a comprehensive description of the approach she takes to teaching math
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 Writing Proofs  Leslie Lamport
PostScript, DVI, and LaTeX versions of each (but no HTML) are available. How to Write a Proof: A method of writing proofs is proposed that makes it much harder to prove things that are not true. The method, based on hierarchical structuring, is simple
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 Writings for a General Audience  Marcus Jaiclin
PDF articles on popular and recreational mathematics by Jaiclin, an Assistant Professor at Westfield State University: Notes on Mathematics of Voting Methods; Fractals, Pascal's Triangle, and the padic Numbers; Airplane Passenger Seating Problem; No
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 Writings from the MegaMath Project (MegaMath)  Casey, Fellows, Koblitz; Los Alamos National Laboratory
Documents containing classroom materials and discussions of mathematics pedagogy. The Los Alamos workbook; Lessons for math teachers; An hour in the classroom; Literacy lessons and mathematics learning; Computer science in elementary school; Combinatorially
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 Writing to Develop Understanding: The Math Forum @ Drexel's PoWs  Suzanne Alejandre
What can we ask students about their problem solving that will help them the most? This article, originally published in the December, 2006, issue of the CMC ComMuniCator, journal of the California Mathematics Council, addresses that question by examining
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 wrotniak.net  J. Andrzej Wrotniak
Includes shareware and freeware programs for Windows written by Wrotniak: scientific and regular calculators, a spherical geometry calculator, a logic and strategy game, a statistics graphing program, and a simple program to compute the area of a polygon.
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 www4teachers
A center for practical ideas about technology in education. Articles published online, updated monthly: teacher interviews on firsthand classroom technology; interviews with educational technology leaders; interviews with kids; howto columns on classroom
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 www.caseymongoven.com  Casey Mongoven
In his music, Casey Mongoven works with Fibonacci numbers, related sequences, and the golden ratio. The site includes scores, writings, WAVs, and MP3s among other files available for download. In English and German.
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 www.logic.at  University of Technology, Vienna, Austria
A group in Applications of Formal Logic. This server contains the home pages of
the Institut für Computersprachen; the Abteilung für Anwendungen der formalen Logik; the Kurt Gödel Society; the Vienna Group for Multiplevalued Logics;
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 WWWMath Discussion Group page  Phillip Kent
An email discussion group dedicated to the subject of Mathematica and its interconnection with the WWW, HTML, VRML, Java, and other topics. This site includes a policy statement, how to subscribe, a mail archive, answers to frequently asked questions,
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 www.mathjobs.com  Christof Luchsinger
A listing of mathematics job openings. Display listings according to their geographic location or language requirements, subscribe to updates by email, or read about how to apply for a job. The site categorizes employment opportunities into the broad
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 www.MAZES.com  John Knoderer, The MazeMan
Mazes in a variety of shapes and topics, with other mathematical puzzles as well. Mazes: Message, Shape, Pizza, Movie Madness, Hidden Picture Octomazes, Satellite (Circular) Mazes, Hexagonal, Mathematics Mazes. Puzzles: Magic and perfect squares, Number
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 www.MonteCarloSimulations.org  The Monitor Group, Inc.
A resource library for planners interested in learning more about Monte Carlo and other tools to deal with uncertainty. Read "What is Monte Carlo?" and "Why Monte Carlo?" Find events, literature, software, and more.
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 www.multiplication.com  Krimsten Publishing
Ideas and products to help students understand multiplication and learn their multiplication facts. In Krimsten's rhyming method, for example, visualize a product such as 3 × 4 = 12 as a story about a tree ("three"), door ("four"), and elf ("twelve").
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 www.onlineklas.nl  Paul Koning
Flash games for practicing addition (sommenkampioen) or multiplication (tafelkampioen), with timers, high score tables, and memory components (tafels oefenen). Also, drill in identifying fractions, or converting between mixed numbers and improper fractions
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 WWW Resources for Teaching Statistics  Robin Lock; Mathematics Dept., St. Lawrence Univ., Canton, NY
A paper presented at Technology in Statistics Education, a 1998 conference for teachers sponsored by the Boston Chapter of the American Statistical Association. Its purpose is to direct readers to typical statistics instruction support sites on the WWW.
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 www.TItutorials.com  Mark Turner
Online instructional tutorials and CDROMs for using Texas Instruments graphing calculators (TI83 or TI83 Plus) in mathematics courses. (You must register and pay a onetime fee.)
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 WWW Virtual School: PreAlgebra  Highview; ThinkQuest 1997
In Highview's 1997 Math program the 7th graders were either in PreAlgebra or PreAlgebra Challenge; the supervising teacher for this page was Mr. Larson. Short essays on: Metric Takeover; Goldbach's Conjecture; Factor Game; and WS: Super Bowl Ad Costs.
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 XGC: an eXtension of Goldbach's Conjecture  Andrea Ercolino
XGC is based on a new version of the Eratosthenes' Sieve. GC: Every natural n = 2*k, where k >= 3, is the sum of 2 odd primes. XGC(c,m): Every natural n = m*k, where k >= c + m, is the sum of m numbers belonging to the Euclid(c,m) set. Includes
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 XLfit: Curve Fitting in Excel  ID Business Solutions
XLfit® is a Microsoft® Excel addin that brings the power of scientific mathematics and statistics to Excel, together with supporting charting capabilities. There are over 70 outofthebox models for both linear and nonlinear curve fitting available
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 XLMath SAT Prep: eXtreme Learning for the Math SAT Test
XLMath is an online service designed to improve your score on the math portion of the SAT. It features over 300 SATtype questions with changeable numbers, for practice; timed tests to simulate the actual SAT experience; and recordkeeping features so
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 XLpert  Choong Koon Wai, XLpert Enterprises
Shareware and freeware: 4Cast XL (a neural network addin for MS Excel); xl bit (a genetic algorithm addin for MS Excel); nn_Solve (build neural network models with Excel Solver (freeware)); KaotiXL (rescaled range analysis ( Hurst exponent ) with MS
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 XLPrep.com  BerryLime.com, LLC
Online service designed to improve your score on the math portion of the SAT, GMAT and CAHSEE. It features over 300 SATtype questions with changeable numbers, for practice; timed tests to simulate the actual SAT experience; and recordkeeping features
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 Xmorphia  Roy Williams
Pattern formation from differential equations  an exhibition of images and movies. Morphogenesis from a ReactionDiffusion System: Xmorphia is intended to show the variety of patterns that may be exhibited by a relatively simple parabolic partial differential
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 XNumber World  James Redin
With the Extended Numerical Keyboards with Structured DataEntry Capability method, enter a number in the same way as you think on the number; for example, input one million and fiftyseven with the four keystrokes 1, million, 5, and 7, in that order.
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 XP Math: Careers Database  Tak L. Hui
Designed to help students explore a wide variety of jobs that require mathematics, this database includes descriptions for the hundreds of kinds of jobs held by most of the American work force, and is searchable by math topic or industry sector. The job
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