 Why is the Area of a Circle Pi*r^2?  Eva Thury
An explanation of the formula for the area of a circle, based on "slicing" and rearranging the circle.
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 Why is the Mathematician So Messy? (Math Chat)  Frank Morgan, MAA Online
A physicist and a mathematician can clean a house in 6 hours; an engineer and the mathematician in 3 hours; and the physicist and the engineer in 1 hour and 12 minutes. How long would it take the physicist alone?
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 Why is the Product of Negative Numbers Positive? (Question Corner and Discussion Area)  University of Toronto Mathematics Network
A short essay and a description of a practical demonstration.
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 Why It Is Important to Learn Algebra  EdSource
This PDF document is a parent/student guide explaining why Algebra I is a required subject, how it helps prepare students for the future, how Algebra I fits into the student's high school math program, and what parents can do to support their student's
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 Why It's Hard to Fold a Triangle in Half (Math Chat)  Frank Morgan, MAA Online
For a circular piece of paper, the lines along which you can fold it "in half" (with half the area on each side) are precisely the lines through the center. What other shapes work the same way? This works for lots of shapes, such as rectangles, parallelograms,
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 Why Study Math? How to Study Math  Math Forum, Ask Dr. Math FAQ
Why do we need to learn math? When are we ever going to use it in real life? Math study tips.
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 Why Teach Mathematics?  Harold Brochmann
A series of articles addressing the questions Why do we have to learn this stuff? Why do we teach mathematics? Is the mathematics we teach relevant? Why is teaching mathematics so difficult?
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 Wiki Número  Wiki Número
Blog de matemática básica, calculo, estadísticas, juegos con números, ejemplos con resultados, y más. Posts, desde Marzo, 2014, incluyen "Aprenda con ejemplo la Jerarquía de Operaciones," "Formulas de Integrales,"
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 Wikipedia Mathematics
The free encyclopedia's entries on mathematics. A wiki is a collection of interlinked web pages, any of which can be visited and edited by anyone at any time. Many pages also available in a range of foreign languages.
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 Wild About Math!  Sol Lederman
Math posts, which date back to October, 2007, have included "10 ways to get wild about Math," "How to square large numbers quickly (part 1)," "26 tips for using learning styles to help your kids with Math," "The algebra of crossmultiplication," "Flexagon
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 William's Home Page  William Gibbs
A collection of activities that use simple materials to help students explore mathematical concepts. Topics include: shapes and patterns made from paper circles; geometrical activities with magic paper; window patterns from geometrical shapes; where there
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 Will it rot my students' brains if they use Mathematica?  Theodore W. Gray and Jerry Glynn
Excerpts from the introduction to The Beginner's Guide to Mathematica V4. Jerry: "I have young students who reach for their calculators to get the answer to 5×6. My response, when I see that, is to explain that such behavior is socially unacceptable,
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 Wilson A. 'Snowflake' Bentley (18651931)  Tobias C. Brown
An American farmer who spent most of his life producing photomicrographs of snowflakes at his Jericho, Vermont farm. The site includes a Snow Crystal Display with a sequence of 26 images.
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 WINDandSEA  The Oceanic and Atmospheric Sciences Internet Locator  The NOAA Central Library
An atmospheric and oceanic sciences Internet Resource Locator with over 800 selected links to science and policy sites organized by topic and alphabetically within topic. Current interest topics (Year of the Ocean; El Nino)a teacher's corner with teachingrelated
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 window into a math classroom  Sadie Estrella
A snapshotdriven blog subtitled "a glimpse into a math classroom once a day." Estrella's posts, enlivened with pictures of her students and of their work on classroom dryerase whiteboards, have included "Trying Math MetaCognition," "More Arguing about
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 WinFiles.com Windows Shareware Collection  CNET, Inc.
A searchable virtual shareware library. Newest shareware, and shareware classified and sorted by platform on "categories" pages  for details, see the Readme file. Includes calculators, mathematical graphing tools, unit converters, educational games and
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 WinFlash Flashcard Library  Open Window Software
A general purpose study program for helping students memorize math facts. Free flashcard decks and a fractions problem generator for use in mastering basic arithmetic facts. For use with any of the WinFlash series of flashcardbased learning systems.
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 A Winning Division  Ivars Peterson (MathTrek)
A farmer plans to divide a triangular piece of land evenly between his son and daughter. Because he wants to be scrupulously fair, he would like the two pieces to have not only equal areas but also equal perimeters. Where should he draw the line? This
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 Winpossible
Online math courses in Winpossible's learning environment replicate the live classroom experience through authoring, presentation and distribution technologies that allow students to hear the teacher's voice and see their handwriting over the Internet.
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 Wisconsin Center for Education Research (WCER)  School of Education, Univ. of WisconsinMadison
One of the oldest and largest education research centers in the world, providing an environment where some of the country's leading scholars conduct basic and applied education research. The WCER roster includes nearly two dozen research centers and projects
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 Wisconsin Mathematics Talent Search  Mathematics Department, Univ. of Wisconsin
Each school year, the Talent Search creates five sets of five problems each and distributes them to high school and middle school students in the state of Wisconsin and throughout the world. These problems are not easy, but their solutions do not require
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 Wise Education and Behavior  Rachel Wise
Educational and behavioral tips on math strategies include "Using Games to Teach Computation"; "Teaching Mental Math"; and "Keywords, Relevant Information, Creating Visuals."
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 Without Geometry, Life Is Pointless  Avery Pickford
"Musings on math, education, teaching, and research" by a teacher. Blog posts, which date back to May, 2010, have included "What Makes a Problem Great," "Habits of Mind," "My 6th Grade Version of Algebra," "Technology in School: Where's My Hovercraft?
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 wNetSchool
A resource for K12 teachers, with some information for adult education teachers (i.e., the GED exam). Subscribing to the site is free, but one may also enter without subscribing. wNetSchool provides lesson plans centered around the Internet or educational
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 WolframAlpha  Wolfram Alpha LLC
A computational knowledge engine that "computes whatever can be computed about anything." Query Alpha about "essentially any kind of systematic factual knowledge," with particular strengths in "areas where computation or mathematics have traditionally
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 The Wolfram Demonstrations Project  Wolfram Research, Inc.
A web collection of freely available demonstrations in math, science, and many other areas. Interact with the demonstrations directly in your browser. Each Demonstration contains a set of related links to sites such as MathWorld, The Wolfram Functions
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 Women and Mathematics Network (WAM)  Committee for the Participation of Women, Mathematical Association of America (MAA)
A consortium of Program Directors of outreach programs in mathematics for women and girls, providing professional development opportunities for program directors; forums for sharing ideas and expertise; workshops and forums for prospective directors of
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 Women in Math Project  Marie Vitulli; Department of Mathematics, University of Oregon
Information on all aspects of women and math, including bibliographies of publications (with a search engine), an extensive collection of biographies, links to associations, job, grant, and scholarship opportunities, conferences, workshops and programs,
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 Women & Mathematics  Key Issues in Mathematics at the Math Forum
Find sites relevant to women, girls, and gender equity in the Math Forum's Internet Mathematics Library.
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 Women's Adventures in Science  National Academy of Sciences
This project of the National Academy of Sciences showcases contemporary women in science, and highlights for young people the varied careers of some of today's most prominent scientists. The site draws from and accompanies Women's Adventures in Science,
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 Women's Studies Database  University of Maryland
The women's studies database serves those interested in the women's studies profession and women's issues in general. Collections of conference announcements, pedagogy and other bibliographies by and about women, calls for papers, employment opportunities,
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 WomenTechWorld eStore  National Institute for Women in Trades, Technology & Science
A clearinghouse for products related to women in technology, trade, and law enforcement occupations. Math titles include Developing Math Learning Skills: A Parallel Support Course for the MathAnxious Student; Spatial Encounters: Exercises in Spatial
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 The Wonders of Mathematics  Galileo Educational Network Association
Scores of different puzzles tailored for use in school math fairs. See also photo displays of recent math fairs.
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 Wooden Puzzles and Games  SiamMandalay Company Limited
Wooden brain teasers made by a Thai handcrafts export business: 3D TicTacToe, Block Pyramid, Blooming Star Puzzle, Fit All In, Giant Hidden Passage, Houdini's Challenge, Locking Sphere, Lumberjack's Challenge (Angles and Edges Puzzle), Marble Release,
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 Woodlands Math Zone  Woodlands Junior School, Kent, U.K.
Pages aimed at 711 year olds. Interactive games for math practice are organized under the following topics: Number Skills; Shape & Space Skills; Mental Maths; Preparing for Sats; Educational Games; Times Tables; Measures/Time; Worksheets; Understanding
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 The Woodrow Wilson Indiana Teaching Fellowship  The Woodrow Wilson National Fellowship Foundation
The Woodrow Wilson Indiana Teaching Fellowship seeks to attract talented, committed individuals with backgrounds in mathematics, science, engineering, and technology—including current undergraduates, recent college graduates, midcareer professionals,
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 The Woodrow Wilson Leadership Program in Mathematics  The Woodrow Wilson Leadership Program for Teachers (WWLPT)
WWLPT provides leadership development for and in collaboration with K12 teachers through residential institutes, outreach institutes held around the country, publications by and for teachers, listservs, and its web site. Its mathematics resources include
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 Word Add In Insert Graph  Martin Weissman
If you aree using MS Word and need to insert a graph, with points or a line, this free template does the job, easily and quickly.
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 Word.Net's Ambigram Website  David Holst
An ambigram is a word or words that can be read in more than one way or from more than a single vantage point, such as both right side up and upside down (from Latin: ambi=both + gram=letter). Read the FAQ or create your own ambigrams online.
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 Wordplay  John Langdon
On the application of ambigrams (words as art) in various fields of study. Most ambigrams are based on one form of symmetry or another; most of Langdon's ambigrams exemplify rotational symmetry.
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 Word Problems for Kids  St. Francis Xavier University; Canada's SchoolNet
Word problems by level for students in grades 512, which can help improve problemsolving skills. A hints link is available for difficult problems. Complete solutions are available upon request to teachers with email addresses. From students, principals,
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 Word Problems III  Energy Conservation Enhancement Project
Perimeter, area, and volume measurements; shading the exterior of a home. Math objectives: 1. Use correct formulas to compute geometric measurements. 2. Complete a variety of word problems involving three geometrical functions: area, volume, perimeter.
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 Word Problems  Jim Loy
Translating word problems into equations, using algebra, then solving the equation(s) and checking your work.
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 Word Problems  Math Forum, Ask Dr. Math FAQ
When I'm given a 'word problem', where do I start? A variety of approaches for tackling word problems.
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 Word problems that lead to simple linear equations.  Interactive Mathematics Miscellany and Puzzles, Alexander Bogomolny
An introduction to the mathematical representation of word problems, with a simple interactive exploration of linear equations.
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 Words & Numbers
Providers of content development services to K–12 educational publishers in the basal, supplemental, assessment, and new media markets. In particular, see their featured math projects and activities for the CBS television drama NUMB3RS. Founded in 2000
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 Working Together  Math Forum, a Classic Problem from the Ask Dr. Math FAQ
Jack can paint a house in 5 days, and Richard can paint the same house in 7 days. Working together, how long will it take them to finish the job?
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 Working with Fractions Using Pattern Blocks  Margo Lynn Mankus
The objective of What's My Number? is to name the size of an object given the size of 1 unit. Materials include pattern blocks cutouts, a pattern block grid, a pattern block Java applet, and links to other pattern block activities elsewhere on the web.
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 Workplace Essential Skills: Resources Related to the SCANS Competencies and Foundation Skills  Employment and Training Administration, U.S. Dept. of Labor
This PDF report provides the results of a comparison of the workplace basic skills defined by the Secretary's Commission on Achieving Necessary Skills (SCANS) with skill frameworks developed by a variety of national and international organizations. The
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 Worksheet Works  WorksheetWorks.com
This site generates high quality PDFs of worksheets with the flick of a few checkboxes. Just specify level of difficulty, range of numbers, font size, or other parameters.
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