 Sudoku  Pappocom, aka Wayne Gould
Finish filling in the 9x9 grid so that every row, every column, and each of the nine 3x3 boxes contains the digits 1 through 9. Different from a magic square, this puzzle requires no arithmetic, only reasoning and logic to deduce which digit to put where.
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 Sudoku  PedagoNet
Sudoku online. New puzzles generated regularly; archive of past puzzles.
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 Sudoku Shuffle  ridiculopathy.com
Play a Flash version of Sudoku online or print out one of these logic puzzles. Choose a level of difficulty and whether to play with number tiles or letter tiles.
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 A Su Doku solver
Solvers for sudoku puzzles, with documentation, source code, and binaries. Frequently asked questions about this numeric puzzle include "Su Doku" or "Sudoku"? How does the solver work? How do I compose a Su Doku problem? How few cells could appear on
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 Sudoku Widget  Brian DeBoer
Macintosh OS X users familiar with Dashboard use its miniapplications to perform common tasks and get fast access to information. The Sudoku Widget by Brian DeBoer generates random puzzles with four different levels of difficulty, has the option to show
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 Suffolkmaths.co.uk  Mark Greenaway
Greenaway hosts a select collection of thirdparty resources in the public domain, many drawn from the UK's Department for Education (DfEs): teaching materials for Great Britain's different grade levels; problem solving documents on problemsolving strategies,
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 Sumdog  Peter Beckham, Crocodile Clips Ltd.
Free multiplayer maths games designed to improve numeracy for students aged
913. Players compete either against the computer or other students around the world. The one hundred available games, which adapt to the skill level of each student, range
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 Suntex First in Math  Suntex International Inc.
Play sample games of 24 online for free, or purchase a site subscription and register for access to a full range of interactive 24 games. Learn more about First in Math classroom kits, school kits, and the McDonald's restaurants First in Math League.
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 Surfin' Sinefeld: Flash Animations for Precalculus, Calculus and Statistics  Ralph Irons
Animated graphing calculators for exponential, logarithmic, sinusoidal and
power functions and their derivatives; animated histogram for 5 data sets;
quizzes; Derivative Pong.
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 Taking Games Seriously  Cut the Knot!, Alexander Bogomolny
In the twenty years since it first appeared, Winning Ways for Your Mathematical Plays had become a classic and a rarity. So did its companion book, On Numbers And Games, which was written in just about a week by one of the WW's authors and saw the light
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 Tangoes  Rex Games, Inc.
Based on the ancient Chinese Tangram puzzle, Tangoes is a learning tool that combines artistic and mathematical elements to enhance visual perception ability, develop problem solving skills, and encourage creative thinking capacity and teamwork. Tangoes
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 Teaching Ideas for Primary Teachers: Maths
Math activities for ages 511 include a puzzle display, shapes worksheets, ideas for making a maths dictionary, a questioning technique, and many more games, worksheets, and activities for the classroom.
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 TeAchnology  Teachnology, Inc.
A portal for information about current and past practice in the field of education. Read math teaching "Ideas That Worked"; and tutorials ranging from teacher retirement planning and "What to Consider When Writing a Lesson Plan" to "How to Deal With Disruptive
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 Team Umizoomi  Viacom International Inc.
Milli, Geo, and Bot solve everyday math problems with their "Umifriend" preschoolers. Get Mighty Math crafts, games, printables, and recipes. Download episodes of this animated liveaction series broadcast on Nickelodeon's Nick Jr. television show.
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 Technologies: Past and Future  Cut the Knot!, Alexander Bogomolny, with Don Greenwell
A discussion of the similarities in browsing through books and surfing the Internet, the serendipitous discoveries that can be made, fallacious geometric and other puzzles, and an interesting integer matrix, with recommendations of books to read and sites
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 TestTubeGames  Andy Hall
Apps, Flash games, and simulations by "an escaped physics grad turned educator.... following his dream to make abstract physics concrete. And draw dinosaurs." Explore special relativity with Velocity Raptor, orbits and chaos with Gravity Sim, particle
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 themathlab.com
Playful, interactive studentmade problems, games, drills, lesson ideas, tools, "magic," and more. Lessons include practice problems which, when solved correctly, generate passwords that grant access to "treasure rooms." Lesson ideas include Algebachee
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 Theoretical Learning  Peter Moxhay
Information about a pilot project in Portland, Maine, public schools to adapt an approach developed in Russia for early math education (grades 13). Includes contact forms and request forms for Portland area parents to download trial math applets for
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 ThinkFun  ThinkFun, Inc.
The makers of Spin Out and Rush Hour seek to "push [you] farther, probe deeper and think more creatively through game play." Brainteaser games include Math Dice, which challenges you to use addition, subtraction, multiplication, division, and exponents
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 Thinking Fountain Shape Cluster  Science Museum of Minnesota
Activities, images, and experiments relating science, math, and language arts. The shapes and math cluster features shape walk, I C shapes (finding circles, squares, and triangles in everyday objects), soap bubble geometry, pyramids and cubes (building
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 Through the Glass Wall: Computer Games for Mathematical Empowerment (TERC)  Testbed for Collaboration, Eisenhower Regional Consortia
An NSFfunded research project that has spent two years looking at how girls and boys play mathematical computer games in order to consider and describe what makes a good mathematical and equitable computer game. The site provides descriptions of over
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 TI83 / TI84 Games and Programs  Bill Paetzke
Bill Paetzke offers TI83/TI84 Plus programs to help students and teachers be more efficient in using their calculators. The programs are organized under these categories: Algebra, Finance, Geometry, Physics, Programs, Statistics, Trigonometry, and Tutorials.
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 Time Math  Education 4 Kids, Inc.
Time, at different levels of complexity (clock and calendar). You are presented with two times (in one of the formats selected) and asked to determine the difference between the two.
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 Toads And Frogs Puzzle in 2D  Interactive Mathematics Miscellany and Puzzles, Alexander Bogomolny
A 2dimensional Frogs and Toads puzzle that is not much more complicated than its 1dimensional analogue, provided, of course, the latter is fully understood. Java applet.
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 Topology and Geometry Software: Fun and Games  Jeff Weeks
Fun math toys for all ages, from the author of Exploring the Shape of Space (grades 610) and The Shape of Space (grades 1216). Applets and software for various platforms. Play with tictactoe, mazes, and the like, on a torus or Klein bottle. Draw
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 Toupty.com: Jeux Éducatifs en Ligne
In French or English: free educational children's games, some involving simple mathematical concepts.
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 Tower of Hanoi  Math Forum, a Classic Problem from the Ask Dr. Math FAQ
There are three posts. Disks of different sizes are placed on the lefthand post, arranged by size with the smallest on top. You are to transfer all the disks to the righthand post in the fewest possible moves, without ever placing a larger disk on a smaller
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 Toying with Reality: Java Applets and VRML  Paul Flavin
Virtual Reality: Modeling with Math, and a little Java. Applets to manipulate: The Pythagorean Theorem; Equation Grapher: "You type, I Graph"; Graphing Vector Calculator; Java 3d Visualizer; Virtual Rubik's Cube; Raytracing applet; Java Calculator; Play
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 Traffic Jam  Math Forum
Equal numbers of people face each other with one open slot between them. Everybody faces the open slot. If there are 6 people there will be 7 slots, 6 of
which must always have people in them. People must attempt to exchange places without turning around.
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 The Treb Challenge  GlobalSpec, Inc.
Custom build a trebuchet for three challenges: distance, accuracy, and power. Between launches, continue modifying the catapultlike seige engine's projectile weight, launch angle, gravity, wind, counterweight mass and height. After each challenge, the
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 Tricky Dice  Ivars Peterson (MathTrek)
The game involves four specially numbered dice. You let your opponent pick any one of the four dice. You choose one of the remaining three dice. Each player tosses his or her die, and the higher number wins the throw. Amazingly, in a game involving 10
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 Trouble with WildCard Poker  Ivars Peterson (MathLand)
Poker originated in the Louisiana territory around the year 1800. Ever since, this addictive card game has occupied the time and teased the minds of generations of gamblers. It has also attracted the attention of mathematicians and statisticians. The
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 Tumblehome Learning
Makers of educational products such as Lost in Tangrams and  through a partnership with TERC, with funding from the National Science Foundation (NSF)  Mixing in Math (MiM) cards, gameboards, and books.
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 The Tutor House: math  Adrianne Meldrum
Tutoring elementary and middle school students, Meldrum would often "hunt the Internet for tips and helps on teaching concepts to my students. I find great stuff, but I wanted somewhere central that other tutors like me could find them...." Every Wednesday
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 tutpup
Basic arithmetic questions for children to solve while racing against each other, anonymously, as a clock counts down. The site shows what you got right and wrong, and how your performance compares with your opponent's on each question. The games run
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 Two Trains  Math Forum, a Classic Problem from the Ask Dr. Math FAQ
Two trains leave different cities heading toward each other at different speeds. When and where do they meet?
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 The UK National Lottery  MerseyWorld
Using real data allows due emphasis to be given to the context and so may encourage crosscurricular links. The UK lottery site has links to many pages with varied statistical information about winning ticket numbers and prizes (see Lottery Links).
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 Untangled  Mehta, Gayatri; Luo, Xiaozhong; et al.
Map and place logic blocks in this game to make more compact circuit layouts on a grid  and more efficient computer chips. Visually appealing graphs bring nodes closer to parents or children and untangle knots in graphs; behind the scenes, the accumulated
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 USA Map Jigsaw Puzzle  Jill Britton
Students are challenged to move each of the contiguous 48 states into the correct position on the map. Note the number of colors necessary for separation of the states.
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 Villainy, Inc.: Thwarting World Supremacy through Mathematics  Maryland Public Television
To thwart the evil Dr. Wick, ID, middle grade students take on the role of an advisor to his company, Villainy, Inc.  while secretly using their math skills to make sure Wick never succeeds. As undercover double agents for the AntiVillainy Unit (the
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 Visual Structure of Postulates and Axioms in Algebraic Operations
(SMILE)  Sanford Olshan, Roosevelt High School
A lesson designed to reinforce and retain the use of axioms and postulates in various proofs and linear transformations of equations; and to have student build a physical model of the game of "PRUFF" either as a card game or as a board game. From the
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 WebBased Mathematics Activities for the Early Years  Instituto de Informática Educativa (IIE), Universidad de la Frontera, Temuco, Chile
These materials are a translation of the Spanish materials created by the Instituto de Informática Educativa (IIE), Universidad de la Frontera, Temuco, Chile. The first and second units have been translated into English, and the third unit is available
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 What2Learn  John Rutherford
For free, a range of fun, interactive games and puzzles. Math topics covered include algebra, times tables, fractions, decimals, percentages, ratios and probability. Feebased service includes more activities, the option for teachers to add their own
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 What is Go?  Mindy McAdams
An introducation to the 4,000 year old Chinese board game called Go in Japan, Baduk in Korea, and Weichi in China. Teaching materials and links to many of the most popular Go websites are included. Contents: brief history of the game; professional players,
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 Who's Really Ahead?  Ivars Peterson (MathTrek)
The winding down of the current baseball season seems an appropriate time to take a look at a curious inconsistency that sometimes appears in team standings... Once in a while the team with the higher winning percentage may be at least onehalf a game
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 Who Wants to Be a Mathematician  American Mathematical Society
In the game show "Who Wants to Be a Mathematician," high school students compete for cash and prizes by answering multiple choice mathematics questions. Read about past performances of the game; view videos of games played in Danvers, MA, at Danvers High
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 WIMS (WWW Interactive Mathematics Server)  Université de Nice  Sophia Antipolis
Interactive mathematical applications, also available in French, with documentation. The server's exercises and programs are designed to find a polynomial with given values; find the Taylor expansion of a function; find a polynomial from its curve; given
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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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 The Wizard of Odds  Michael Shackleford
As a rule of thumb, the harder a game is to understand the better your odds of winning if you do understand it. By understanding the more complicated games such as blackjack, baccarat, and craps you can have an expected return of at about 99 cents per
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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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