 0h h1  Martin Kool
A "little logic game" related to Takuzu and Binario: complete grids of 4 × 4, 6 × 6, 8 × 8, or 10 × 10 so that all rows and columns have an equal number of each color, but none has three adjacent tiles of the same color or shares the
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 The 24 Game  Suntex International Inc.
A site showing all the editions, challenge rules, tips, hints, and more about the 24 Game. Designed for all ages, play proceeds by creating the number 24 from the four numbers on a game card using addition, subtraction, multiplication, or division. Watch
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 24 Theory
This "hobby website" offers JavaScript that calculates, enumerates, and displays all distinct solutions and solvable scenarios to the popular arithmetic card game, as well as interactive tables. 24theory.com also provides an online version of the 24 game
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 2Learn.org  Linda Blumenthal, Thinkwell Corp.
Offering a variety of products including a comprehensive learning plan, created online. Many free resources for teachers, parents, and students, as well. Math games and tools.
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 3D Nauta
A threedimensional spatial, topological problem/game with Web interfaces in Spanish, French, and English. Of two versions of the game, one is accessible
to most people, while the other can be made difficult exponentially. You are invited to order your
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 7puzzle  Paul Godding
School visits by the UK's "Puzzle Man" feature numberrelated board games, card games, tricky puzzles, and other math activities that involve logic, strategy, and spatial/visual awareness to improve children's mental arithmetic skills and feed their enthusiasm
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 AAA Math  John Banfill
Online interactive lessons, exercises, practice, and games about basic arithmetic concepts and methods, for grades K8. Topics include addition, comparing quantities, counting, decimals, division, estimation, factors, fractions, money, multiplication,
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 Aard 3D Puzzles  AardAsNails Software
Rubik's cubelike puzzles to solve online. Virtually twist and spin a pyramid, cube, diacube, or diamond, selecting solid or transparent views. Purchase the full version for up to ten levels of difficulty and preset problems.
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 About Rubik's Cube  Dan Knights
See the author's collection of Rubik's cubes, his solution and timing methods, thoughts on solving Rubik's Cube with your eyes closed, and suggestions for lubricating your cube and where to get them.
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 Active Algebra  David Womersley, Active Maths Limited
Interactive resources designed to enhance and enrich the teaching and learning of algebra. Free trial version available online; buy the CD and get a password which will remove the evaluation logo from those versions. All the activities can be used either
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 Add It Up  CleverMedia
Combine tiles that sum to the target number. Earn extra points for combining more tiles or consuming less time; win a bonus for using up all the tiles; lose points points for every tile left on the board. Requires the Flash plugin.
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 AgentSheets  AgentSheets, Inc.
A combination of enduser programmable agents, spreadsheets and Java authoring tools. The new version of AgentSheets lets endusers build a wide range of applications that include interactive simulations, games, and intelligent web agents. Projects created
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 Algebra Funsheets
Algebra worksheets that integrate Algebra skills with sudoku, riddles, games, word finds, etc. Created by an algebra teacher. Browse topics covered, see sample worksheets, or subscribe for complete access.
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 Alien Tiles Official Web Page  Pickover and Mckechnie
A difficult puzzle developed by Dr. Cliff Pickover and Cam Mckechnie. (Some have called it Rubik's cube for the new millennium.) The rules are simple, but the patterns soon become very complex. The authors look forward to hearing from artists, puzzle
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 All About Addition (AAA Math)  John Banfill
Interactive math exercises, lessons, and games covering addition facts and
addition of whole numbers, decimals, and fractions.
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 All About Decimals (AAA Math)  John Banfill
Interactive math exercises, lessons, and games to teach naming, adding, subtracting, multiplying, dividing, and converting decimals.
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 All About Division (AAA Math)  John Banfill
Interactive math exercises, lessons, and games covering division facts and
division of whole numbers, decimals, and fractions.
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 All About Fractions (AAA Math)  John Banfill
Interactive math exercises, lessons, and games covering identifying, adding,
subtracting, multiplying, dividing, and converting fractions.
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 All About Multiplication (AAA Math)  John Banfill
Free, interactive math exercises, lessons, and games teaching multiplication tables, fact and multiplication of whole numbers, decimals, and fractions.
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 All About Percents (AAA Math)  John Banfill
Interactive math exercises, lessons, and games covering finding, converting, and using percents.
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 All About Subtraction (AAA Math)  John Banfill
Free, interactive math exercises, lessons, and games covering beginning subtraction facts and subtraction of whole numbers, decimals, and fractions.
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 allmath.com  Arbor Media, Inc.
Math tools (flash cards, a metric converter); games (magic square), and reference pages: biographies, a glossary, the multiplication table, metric conversion factors, and an ask an expert service.
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 alt.math.recreational  Math Forum
An unmoderated newgroup focused on recreational mathematics. Read and search archived messages; and register to post to the discussions.
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 A+ Math
A site developed to help elementary school students improve their math skills interactively, offering: educational math games (learn basic operations and geometry by playing MATHO  bingo and math combined; Hidden Picture; and Concentration), Web flash
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 American Go Association
Learn to play the ancient Chinese board game called Go in Japan, Baduk in Korea, and Weichi in China. Go is said to be 4,000 years old, and is played worldwide. This site lists clubs and resources for beginning and expert players. The AGA provides free
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 Arcademic Skill Builders
Online educational JavaScript arcade games that teach automaticity and fluency with the four basic arithmetic operations. Single player math games include Meteor Multiplication, Demolition Division, Alien Addition, and Minus Mission. Drag Race (division),
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 Archimedes' Square (Stomachion)  Kadon Enterprises, Inc.
Square puzzle dissected into 14 tiles, described in Archimedes' palimpsest. Oldest documented puzzle in history, from ca. 250 B.C. Now known to have 536 distinct solutions.
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 Are You Better Than Average?  Todd Curtis
Dice game developed to quickly demonstrate some of the basics of probability. You'll need one pair of dice, a throwing tray or other flat surface, and a score sheet.
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 Arithmemouse  Tinman Learning, Inc.
Arithmemouse Times Tables is a multiplication game that facilitates teaching children multiplication factsnot just a drill. It is nonviolent, with light puzzles, and without life meters or punishment for failure. A free demo is available. Arithmemouse
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 Arithmetic and Algebra  Interactive Mathematics Miscellany and Puzzles, Alexander Bogomolny
More than 110 games or puzzles having to do with arithmetic or algebra, with extensive discussions and solutions. Most require a browser capable of displaying JavaScript or Java.
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 Arithmetiles: Speed Math Skills
Online game to warm up your brain with fairly easy math challenges. Downloadable versions available for purchase.
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 Arnd Roth  Arnd Roth, Institute for Theoretical Physics, Heidelberg, Germany
Arnd Roth studies computational physics and neuroscience. This page provides documentation and code for related Mathematica notebooks, and a notebook for the Knight's Tour chess problem, available online. Also links to abstracts or text of many of Roth's
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 Asteroids in projective geometry  Flynn, Heath
A game similar to "Asteroids," but set in the projective plane. Written in Director 8 by high school student David Flynn with some technical help from Dr. Deej Heath, it is playable via Shockwave.
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 Atlantis Puzzles & Games  Karl Scherer
Puzzles and games for sale; puzzle books (A Puzzling Journey To The Reptiles And Related Animals; NUTTS And Other Crackers; New Mosaics  A Book On Tilings); Fractal computer art; brain teasers (AMaze; Globetrotter). Also ALIVE, a WINDOWS version of
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 The Awari Oracle  John Romein
Play the ancient African "count and capture" strategy board game, related to mancala, and also known as wari, awale, oware, or ayo. Dutch computer scientists from Amsterdam's Vrije Universiteit developed a program that computes the best move and eventual
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 Baseball TIVY
Commercial site for an educational math strategy board game for students in roughly grades 38. Competitive involvement with two or more players individually or on teams; local, regional and national tournaments. "A proven winner for increasing test scores."
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 Base Ten and Fraction Activities  Mike Gralish
Online math manipulatives for understanding fractional parts and
base ten operations
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 BasketMath Interactive  Robert Cummings, Science Academy Software
Science Academy Software's BasketMath online interactive application drill and practice site offers autoscoring questions in arithmetic, rounding and writing numbers, order of operations, factoring, adding or multiplying signed numbers, calculating perimeter
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 Big Math Attack!  Educational Software
For PCs, this game includes math solving and metric conversion as well as spelling and typing skills practice. (Spelling section is customizable.) Downloadable evaluation copy available in several versions.
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 bontegames  Bart Bonte
Logic and physics Flash challenges from the independent game designer behind "factory balls" and "sugar, sugar": a blocky christmas, furiosity, 40xEscape, farafalla, 14 locks, and more.
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 Brainormous
Worksheet makers and math games available for demo or purchase: Zeus' Petals, Fourdoku, Multiflyer, Mathteroid, Gridiant, and more.
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 Brainwave  Wognum Art
Ten visual puzzles, to test your visual and reasoning skills. Most have to do with symmetry recognition. There is a "top 5% brain" award to those who earn ten "smart bulbs."
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 BrighterDiscovery.com  KW Studios, Inc.
Products for children to "reach their full potential while having fun doing it." Browse by age (from 012 months to 8+ years) or product type, including Activity Toys, Alphabet & Numbers, Blocks & Building Sets, Games, Puzzles & Logic, and
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 Burnt Toast Publishing  Bran McMillin
Burnt Toast Publishing offers the math puzzles for free use.
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 Calculation and the Chess Master  Ivars Peterson (MathLand)
In 1912, J. B. Shaw wrote in the Bulletin of the American Mathematical Society: "The game of chess has always fascinated mathematicians, and there is reason to suppose that the possession of great powers of playing that game is in many features very much
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 Centre for Innovation in Mathematics Teaching  University of Plymouth
A focus for research and curriculum development in mathematics teaching and learning with the unifying aim of enhancing mathematical progress in schools and colleges. The site includes: The Mathematics Enhancement Programme; Resources: worksheets in HTML
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 The Chaos Game  Robert L. Devaney; Dept. of Mathematics, Boston University
One of the most interesting fractals arises from what Michael Barnsley has dubbed "The Chaos Game," which is played as follows. First pick three points at the vertices of a triangle. Color one of the vertices red, the second blue, and the third green.
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 Chaos in the Classroom  Robert L. Devaney; Dept. of Mathematics, Boston University
One of the most interesting applications of technology in the mathematics classroom is the fact that it allows teachers to bring many new and exciting topics into the curriculum. In particular, technology lets teachers bring some topics of contemporary
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 Chaotic Dynamical Systems (Serendip)  Victor J. Donnay; Bryn Mawr College
In dynamical systems, an object moves according to a rule. Depending on the rule motion, the object may move in a regular fashion or in a chaotic fashion. This project by Prof. Donnay, his students, and colleagues illustrates the ideas of chaos theory
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 Chess Math (SMILE)  Louis C. Jackson, Lincoln Elementary School
A lesson designed to reinforce students' knowledge of angles as they become chess
pieces on a floor chess board. From the Patterns and Logic section of a collection of almost 200 single concept lessons by the Science and Mathematics Initiative for Learning
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