 KenKen @ the Math Forum  Nextoy, LLC and the Math Forum @ Drexel
A collection of KenKen puzzles ranging in size from 3x3 to 9x9, at four difficulty levels, with many combinations of arithmetic operations. The site offers an introduction to KenKen, lesson plans, rules, discussion, and tutorial. KenKen is a number puzzle
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 Ken Shirriff
A researcher at Sun Microsystems. Annotated bibliographies on fractals and cryptography, and related papers, which may be downloaded in PostScript format. Graphics of Voronoi fractals (dividing the plane into regions closest to a given point) and fractals
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 Ken's Puzzle of the Week  Ken Duisenberg
A weekly puzzle for advanced high school or college level, with a math, geometry, or game focus. The problems are easy to understand but tricky to solve. An archive of previous problems and solutions is included, together with a list of other puzzle sites
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 KeyedIn Magazine  nelsonthornes.com
Weekly puzzles, quizzes, features of great mathematicians, fun with numbers, and strategy games. An Internet quest and "the serious stuff" offer selfscoring problems. Teacher resources provide links and ideas for each chapter of the Nelson Thornes Key
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 KidsBank.Com  Sovereign Bank
A tutorial site in the form of an animated storybook that teaches about money, from the penny to the transfer of electronic funds. Children join characters on a tour of Money, Savings, Interest, Checking, and Electronic Banking, five chapters each hosted
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 Kids Corner  Hope Paul Productions
Games to play online, and a demo to download: Solid Geometry (make your own 3dimensional shapes), and a store where you can order math toys and games.
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 Kids Math
Elementary and intermediate drill exercises/games (timed, with answers shown correct or incorrect) for learning addition, subtraction, multiplication, division, fractions, decimals, measurement, graphs. In English, Spanish, and Chinese. Also prealgebra
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 Kidsmath  About.com
A guided portal to the world of kids' internet math sites. Includes links to math sites categorized by level and topic; math newsletters (which typically highlight a group of sites on one topic, with associated articles); discussion forums; monthly problems
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 KidsPsych  Magination Press
Flash games to help young children develop cognitive thinking and deductive reasoning: Oochina on the Farm, Rotating Faces, Oochina in Space, I Spy, Oochina the Archeologist, Oochina's Doughnut Dilemma, Oochina the Treasure Hunter, Oochy's Cube Adventure,
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 Knight Coverings for Large Chessboards  Frank Rubin
Knight coverings for square chessboards up to 26x26, and proofs of optimality for boards up to 10x10. The problem of how to cover a chessboard with the smallest number of knights has fascinated mathematicians and chess players for years. The problem is
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 Knight's Tour  Gunno Törnberg
Describes two methods for finding Knight's Tours (paths for a chess knight to visit every square on a chessboard), backtracking and Warnsdorff's Rule. Java applets demonstrate both methods.
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 Knowledge Adventure
A developer and publisher of interactive multimedia products for kids and educators. Products include the Blaster Series (Math, Spelling, Writing, Reading), FisherPrice Ready for School, JumpStart activities for elementary grades, and Kaplan Higher Scores
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 KRN Software
Free online games for Javaenabled browsers. Java Edutainment games require matching shapes and colors in Space Cargo and Cargo Bay, simple addition in Numeric Defenders, and odd and even number identification in Even Steven, Jr.
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 Krypto  The Making People Happy Games Company
Krypto game play begins by dealing five cards, each with a positive integer. Use any of the four basic operations to arrange the first four numbers into an arithmetic equation that yields the fifth "objective" quantity. Play online with a Javaenabled
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 Kuutigo  Sakari Rosenqvist, Osmo Kotonen, Rosentwist Oy
KuutigoŽ is a Finnish educational and recreational game designed for practising exercises in mathematics and vocabulary. At the same time, it develops logical thinking, motor skills, and concentration and memory. Manufactured completely in Finland, the
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 Labyrinth  Peter Kishalov
An online puzzle: choose the correct door to advance through the labyrinth, based on logic puzzles similar to those published by Raymond Smullyan in his book The Lady or the Tiger?.
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 Lammas  Peter Fox
A simple game of logic using a number of differently coloured tiles arranged in a grid. The object is to convert the complete grid to tiles of a single colour. The rule for conversion is given by the four tiles at the top left corner as a template. A
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 Learning Game Finder  Media Match, LLC
Subscribe to search peerreviewed lists of learning games along with the rules for play and the technical requirements to run the game.
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 Learning Games and Activities for K12  Creative Teaching Associates
Over 200 nonelectronic learning games and activities for ages 4 through adult. Math products include flash cards, activity cards, board games, math chips, cards, books, cassettes for basic math facts drill, and many more. Products are also listed by
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 Learning Planet  Michael Schipper
A site that offers online interactive learning games, in Shockwave, stressing basic math (and other) skills for preschool to sixth grade. Games include Number Train, 123 Order, Count Your Chickens (all number learning games); Spacey Math (four basic operations);
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 Learning Wave Communications  Human Relations Media
Learning Wave is a producer of videos, CDROMs and other supplementary materials for math education including interactive games such as Absurd Math. Under the name HRM Video it has created programs such as middle school math mysteries, applicationsbased
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 Lemonade Stand  Jason C. Mayans
A Web version of the computer game Lemonade Stand: you have to decide how many cups of lemonade to make based on the weather forecast. You also have the option to advertise and attract more customers. You receive a daily report with financial information
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 Les jeux de Lulu, le lutin malin  Regine
Jeux, écrits en JavaScript: jeux maternelle autour du nombre, orientation, déplacement, mémoire; jeux élémentaire et plus (logique, math, orientation). JavaScript games for children.
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 The Lighter Side of Dr. Paulsen  William Paulsen
A collection of online games and puzzles: blackjack, The NonZero Difference Game, No Alibi (a mystery detective game), a haunted mansion labyrinth, sliding tile puzzles, and The Prime Maze.
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 LiveCube.com  Min Shih
A puzzlebuilding system: small colored cubes may be joined to create larger assemblies. Site includes puzzle models, discussion areas for puzzle designers and educators, and a catalog of puzzle components for purchase. Requires several plugins; files
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 Lizard Game (MatheMUSEments!)  Ivars Peterson (Math Muse for Kids)
The rocky Coast Range of California is the setting for an unusual game played by a brightly colored sideblotched lizard. Each male of the species has one of three throat colors, and each color of lizard has a different mating behavior. The lizards play
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 Logic Games  Yoogi Games
Logical games, involving math, logic, and problemsolving skills. Free trial downloads, full versions for purchase. For Windows machines.
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 Lumosity: Brain Games & Brain Training  Lumos Labs
Lumos Labs has designed these games and training exercises to improve cognitive functions such as memory, processing speed, and reasoning in adults. Read Lumosity's articles to learn about the science behind the program. Sign up for a free trial account.
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 Lure of the Labyrinth  Learning Games to Go (LG2G)
In this free online adventure game, middleschool prealgebra students rescue their pets, combat mysterious monsters, and embark on whimsical math missions to gain a better understanding of proportions, fractions, and ratios, variables and equations,
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 Mad4Maths  John Massey, Mad4Maths.com
A free fun animated website featuring games and puzzles for kids aged 610 yrs. Also features guides for parents on how maths in now taught in schools and explanations of current multiplication, division, and addition/subtraction methods.
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 Magic Cards  Chunsheng Ban
You see four cards, each with eight numbers. Think of a number from 1 to 15; Check ALL the boxes below the cards that contain your number; Click on the button "What's My Number?"; Your number will be displayed on the screen. Based on an exercise in a
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 Magic Cube 4D  Melinda Green, Don Hatch, and E. Jay Berkenbilt
MagicCube4D is a fourdimensional Rubik's cube  an exact analogy in four dimensions to the original plastic three dimensional puzzle. Download the Java applet or pacakges for UNIX, Linux, or C++ source code.
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 Magic Math Kingdom  Nippon Educational Software Laboratory
Magic Math Kingdom is math game software, in which kids solve elementary math problems in order to rescue a frog princess. Also available is the Internet Geometry Education Tool OMAIL. With OMAIL, students can learn geometry by manipulating lines or
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 Magic of Perfect Shuffles  Ivars Peterson (MathTrek)
S. Brent Morris likes to say that he's the only person with a doctorate in card shuffling. A mathematician at the National Security Agency (the world's largest employer of mathematicians) in Fort Meade, MD, he is also a showman, specializing in card tricks.
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 The Magic Sierpinski Triangle: (Serendip: Complex Systems)  Bryn Mawr College
Order dependent on randomness: the Chaos Game. Construct Sierpinski's Triangle using Java interactively on the Web and focusing on one particularly interesting question: what is the right way of choosing the vertices? In the construction, the elegant
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 Mag's 3x3 Rubik's Cube Solution  Tom Magliery
A small collection of operations for the 3x3 Rubik's Cube, which assumes that you already know how to get one entire face solved; this means not only having all of one color on one side, but also having those 8 pieces in the proper position with respect
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 Mamikon  Mamikon Mnatsakanian
Thoughtprovoking Shockwave Flash animations of geometric constructions, graphs, games, and much more. Mnatsakanian's site http://www.mamikon.com/ links to dozens of the articles he has coauthored with Tom Apostol in journals such as American Mathematical
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 Mancala Snails  RocketSnail Games
A Mancala game with a twist: the pebbles are in the shape of a snail. Play online or download a version for Windows.
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 Mancala Web  Brian Casey, Imagiware, Inc.
An ancient, challenging game. Mancala is played with seven pits  six playing pits plus one score pit, the Kalaha, per player. At the beginning of the game, each of the (12) playing pits contains 3 seeds (or beads or stones or balls or whatever). To play,
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 Mastering Mastermind  Ivars Peterson (MathTrek)
"Games offer wonderful playing fields for developing mathematical problemsolving skills. For Mathew Mitchell of the School of Education at the University of San Francisco, the preferred training ground is a classic game called Mastermind. "Students young
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 MasterMathMentor.com  Stu Schwartz
Quizzes, exams, exam prep, and other calculus and precalculus materials from an Advanced Placement (AP) Calculus and Statistics teacher of 35 years and Presidential Awardee for Teaching Excellence. Schwartz's materials for sale include "Calculus: Ripped
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 Matematicamente.it  Antonio Bernardo and Marcello Pedone
Esercizi svolti, raggruppati per argomenti; appunti di analisi; test di matematica, per le medie superiori; tesine maturità agli esami di stato; ingresso superiori; approfondimenti, spunti e idee per insegnanti e studenti; misura il Quoziente di
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 A Matematica, um ABC do xyz: Professor Cardy  Cardy Meier
In Portuguese, lessons, articles and games primarily about algebra and geometry (including projective geometry).
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 Matemáticas básicos para niños  J. A. Cordero
La resolución de problemas, no solo de ejercicios, es la parte fundamental del aprendizaje de las matemáticas básicas. Los problemas implican una pregunta que no se sabe responder con los conocimientos inmediatamente disponibles.
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 Matemáticas Educativas  Juan Ubeda
Portal dedicado a las matemáticas a nivel educativo: biografías, aplicaciones didácticas, apuntes, problemas, profesor virtual, recortes de prensa, juegos on line, programación, enlaces, etc.
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 Mathador  SARL Mathador
Mathador, c'est jongler avec les chiffres comme on peut jongler avec les lettres dans de nombreux jeux de lettres. Introduction, un jeu de calcul, principes, situations de jeux, contact, revue de presse, et une animation.
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 Math Attack: How to Reduce Math Anxiety in the Classroom, at Work and in Everyday Personal Use  Marilyn CurtainPhillips
A book with related card game and professional development. The book presents strategies for dealing with "math anxiety" and math phobias, in particular for those planning to teach mathematics at the introductory or high school level. Contents include
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 Math Cats  Wendy Petti
A site for children that promotes openended and playful explorations of important math concepts, and more serious reflection on topics such as Hurricane Katrina. Start with the magic chalkboard, then enter Math Cats MicroWorlds (interactive projects);
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 MathDoku
Based on KenKen and loosely similar to sudoku, this online mathematical and logical puzzle challenges you to fill in the grid by combining the four main mathematical functions of addition, subtraction, multiplication and division.
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 Math Doodles  Daren Carstens
Flash activities designed "to provide a place where children can discover the joy, wonder, and fun of mathematics."
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