 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 Not Geometry?  Cut the Knot!, Alexander Bogomolny
An exploration of the validity of teaching algebra at the middleschool level, testing, mathematics ewducation reform, the goal of education, and a suggestion that geometry might be a more important starting point.
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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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 Wilder's Fourth Grade Math and Science  Jim Wilder
Wilder's blog, which dates back to July of 2008, has included posts such as "Pumpkin Investigation/Family Math Night," "Spuds, Velocity, & Central Tendency," "predict the pattern," "codes and the tricky elevens," and "thinking about patterns." Wilder
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 William Lowell Putnam Mathematical Competition  The Mathematical Association of America (MAA)
The examination tests originality as well as technical competence. Questions cut across the bounds of various disciplines, and selfcontained questions that do not fit into any of the usual categories may be included. Announcement of winners, description
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 Wired Math  Dean Murray, Soo Go, Jamie Pearson; University of Waterloo (Canada)
A free website created for students and teachers by a teacher for the University of Waterloo. The online games, drills, "follow up exercises," and answers
address topics common to middle grades on every continent. Also availalble from http://www.wiredmath.ca/
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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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 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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 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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 Wondrous Worksheets  Wondrous Worksheets
Purchase a yearly subscription to view over 800 educational worksheets for children covering a variety of topics including maths, science, grammar, handwriting, comprehension and other things. Sample worksheets available free. Or make your own worksheets
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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 Solved by S.M.S. (Solutions Made Simple)  Raymond Davie and Helaine Rabney; YaleNew Haven Teachers Institute
A curriculum unit that stresses organized thinking for solving word problems: Knowing the Problem; Making a Plan; Solving Your Problem; Testing Your Solution, with bibliographies for students and teachers. Recommended for 9th through 12th grade Consumer
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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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 Worksheet Creators  Dan Perkins
Flashbased Worksheet Creators built to easily and quickly generate diverse worksheets for addition, subtraction, multiplication, and division. Shareware.
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 Worksheet Factory  Worksheet Factory
Free math worksheets and flash cards that can be generated and printed from home.
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 Worksheet Genius  Simon Currigan
A free website full of printable worksheets, puzzles, and activities that can be differentiated and randomized at the touch of a button. Designed for those working with children at primary or elementary school.
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 Worksheet Library  Worksheet Library
Standardsbased worksheets. Five hundred available free for trial purposes, across all subject areas. Membership required for access to other worksheets. All in PDF format, with answer keys.
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 Worksheets  RHL School
Worksheets for teaching and reinforcement, with answer keys where appropriate, for: English Basics, Mathematics Computation, Mathematics Problem Solving (most appropriate for 4th and 5th grades), Reading Comprehension, and Reference Skills, plus a section
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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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 World Math Day  3P Learning
The World Math Day website provides five to eighteenyear olds with mental arithmetic questions to solve in competition with other math students from around the globe. Recent World Math Days, which take place in early March, have attracted participation
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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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 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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 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 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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 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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 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 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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 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.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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 XP Math  Tak L. Hui
Features include free materials designed to excite learners in mathematics and technology, a free eBooks
library, a collection of math sites, a database of mathematical careers, an interactive math games league and an active forum.
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 YMath Mathematical Models  Jan de Koning
Models and building boxes for education include magnetically connectable "mathmaker" and "polylinks," and tetrahedron puzzles. Other polyhedral furniture and housewares include cube moneyboxes of plywood, copper, and brass; dodecahedron bottle openers;
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 Yo Quiero Math  A Collection of Basic Math Tutorials  Lucila Rios
Tutorials (online videos and practice problems) for adult school students seeking to increase their understanding of basic high school Algebra to enter community college or pass the GED or CAHSEE.
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 You Can Do The Rubik's Cube  Rubik's, Seven Towns Ltd.
The You CAN Do the Rubik's Cube Solution Kit offers teachers lesson plans, homework sheets, and answer keys aligned to national standards as well as 19 state frameworks, anchors and 21st Century Skills. Lessons and activities support Geometry, Algebra
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 You Have Found The Prisoners' Dilemma (Serendip: Playground)  Bryn Mawr College
Play a nonzerosum game where the best strategy for a given player is often one that increases the payoff to one's partner as well. The rules: on each turn of the game, you and your opponent must choose, without knowing the other's choice; following
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 Young Investor  Columbia Management
Information on investing and investments, along with games and puzzles related to investing. Sections for teachers, parents, and students in grades K12.
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 YourTeacher  Classmate, L.L.C.
Hundreds of online math lessons by a former high school math teacher. Search by course, keyword, or textbook. Freely sample some content; subscribe for full access, plus diagnostic pretests, tools to track progress and performance, and grade reports.
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 Zebragraph  Jonathan Choate
Download Choate's conference speeches, lecture notes, and other resources such as his Exeter courses and talks. "Enriching the Traditional Geometry Curriculum Syllabus" features the Problem of Regiomontanus. Investigations include the tetrahedral geometry
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 Zimaths  University of Zimbabwe
An electronic maths magazine with clever, amusing articles written to supplement the resources available to Zimbabwean students, most of whom do not have access to extrasyllabus information. Features include: How number plates and ISBNs work; Statistical
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 Zoma's Land O'Logic  David and Zoma Stern
Who Rode the Goat? A logic puzzle with many clues and a link to the answer.
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 Zombie Cat  Diego Fonstad
Zombie Cat shares learning catalysts  those "perfect stories, explanations, or methods to teach complex mathematical and scientific concepts." Insightful math learning catalysts date back to January, 2011, with categories such as "Videos worth watching"
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