 Games for the Brain  Philipp Lenssen
Race the "IQ Score" clock while playing JavaScript brain teasers such as NumberCruncher (perform arithmetic calculations following order of operations) and Marsmoney (calculate the values of different currencies). The site also features several memory,
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 GAMES Group  The University of Alberta
GAMES is a research group for Gameplaying, Analytical methods, Minimax search and Empirical Studies. It produces realtime programs for strategic game such as Amazons, Awari, Checkers, Chess, Domineering, Go, Hex, Lines of Action, Othello, Poker, RoShamBo,
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 Geometry Park: Songs for Teaching Children  Illumisware
Collection of children's songs using contemporary rhythms and sounds to introduce topics in math, science, grammar, and geography. American or Canadian versions each come with teachers' guide and karaoke version.
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 George Washington: Surveyor and Mapmaker  Library of Congress
An essay on George Washington's lifelong association with geography and cartography, "Tracing the Maps in George Washington's Life" contains the chapters Washington as Public Land Surveyor  Boyhood and Beginnings; Washington as Public Land Surveyor 
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 H.I.P. Pocket Change  United States Mint
The History In Your Pocket (H.I.P.) Pocket Change site showcases the connection between this country's coins and its people. Through games, stories, and other engaging activities, the site highlights both the individuals who appear on U.S. coinage and
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 Home of the BEDMAS: A Mathematical boardgame  Alagan Elavalagan
Each player forms an equation on the tile bar using number tiles of random
values. The players should take advantage of the number and operator tiles
to maximize their score.
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 Homeschool Math Contests  Haddon Fox
A list of dozens of math contests open to individuals and which do not require gathering up teams  a requirement that often poses a challenge for homeschoolers. homeschoolmathcontests.com also lists many more regional meets sponsored by colleges and
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 Hummer's Mind Reader  Interactive Mathematics Miscellany and Puzzles, Alexander Bogomolny
Java simulation of a magic trick invented in the 1950s by the magician Bob Hummer. Choose one of three coins. Swap the other two, then swap as many pairs as you like. When you're done, the computer will announce your selection. The explanation includes
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 The Institute of Technology Center for Educational Programs (ITCEP)  Regents of the University of Minnesota
ITCEP develops and administers educational programs in mathematics and its related science and engineering applications for precollege, undergraduate and graduate students, and for K12 preservice/inservice teachers. For children, ITCEP administers the
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 Integer Jim's Math Squad  Jim Bennett
Creative ways to use art, writing, research, and Internet projects to make math more exciting for students. The Math Squad art projects are yearlong projects; rather than "lesson oriented," they create an "adventure theme" that facilitates math instruction.
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 invention at play  Lemelson Center, Smithsonian National Museum of American History
Rotate and translate the tangramlike pieces of Puzzle Blocks to form the silhouettes shown; arrange the gears, springs, funnels, and other objects of Tinker Ball to divert the falling ball into the target. The Invention at Play exhibition focuses on
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 I Used To Believe  Mat Connolley
A collection of childhood beliefs, such as thinking that cats are female dogs, that seeds swallowed will sprout fruit from your ears, and a primal fear of toilets. "Some of the beliefs come from overactive imaginations, but a lot are the result of parental
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 John and Betty's Journey into Complex Numbers  Matt Bower
A children's bookontheWeb from Australia, designed to introduce complex numbers in story form in a way that is intuitive and enjoyable for students. John, Betty, and their dog Trevor solve a series of problems designed to introduce integers, fractions,
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 JovoToys  JOVO Click 'N Construct Math Manipulatives  Alexander's Polyhedra, Alex Doskey
JovoToys are polygon shaped pieces  equilateral triangles, squares and
regular pentagons  that click together on their edges, allowing them to
fold up to make three dimensional shapes. The JovoToys website shows
many different applications of
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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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 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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 Knotology / Snapology  Heinz Strobl
Strobl describes snapology as the origami of wireframe polyhedra, in which edges form "frames" around the faces of Platonic and Archimedean solids. See, in particular, an online PowerPoint introduction to snapology; and instructions for folding objects
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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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 Kung Fu Science  Institute of Physics
Watch martial artist Chris Crudelli demonstrate to physicist Michelle Cain how she can break a wooden plank with one strike of her bare hand. Before actually attempting the feat herself, Cain applies Newton's laws and the conservation of energy to calculate
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 Learning Math is Fun  Kevin Cornell
Learn the order of operations by watching a video of the PEMDAS song. Before becoming an elementary school principal, singer "Mister C" taught 5th grade science and served as a math coach. See also Cornell's science site at http://www.learningscienceisfun.com/.
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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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 Lightning Reflex  Jason Lowe
Online math competitioncompete with people from all over the world. Every month features a different
area, such as timestables or addition. Requires Flash 6 or higher.
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 The Logic Puzzle Museum
Play with more than fifty different handson brain twisters, mechanical and logic puzzles  and craft your own. Regular events at this Burlington, Wisconsin, museum include Valentine's Day (makeyourown historic rebus valentines), celebrations of the
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 The Logic Zone
A collection of logic problems with answers, logic puzzles, and cryptograms.
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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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 The Magic of Math  magicofmath.org
Communicate and share the delight of mathematics. Talk to a math whiz about how math makes the world go round, get pointers on how to figure out a math problem, or just chat about math by sharing cool ideas, original math jokes, poems, riddles, art, problems
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 MakeaFlake  Barkley Interactive
Make your own snowflakes online: use the Flashpowered scissors to cut along the edges of a folded piece of virtual paper. Preview the unfolded results along the way; when ready, save your design to the gallery, where you may view and download plans for
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 MASSIVE: Math And Science Song Information, Viewable Everywhere  Greg Crowther
A searchable database of over 1800 educational songs, including many about math. Part of the National Science Foundation's National Science Digital Library (NSDL).
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 MathAlive!  Evergreen Exhibitions, LTD.
This 5,000 square foot interactive exhibition brings to life the real math behind video games, sports, fashion, music, robotics, and more. Dozens of MathAlive! experiences take math from its native form into the applied worlds of design, engineering,
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 MathAThon  St. Jude Children's Research Hospital
Students participating in a MathAThon obtain sponsors and earn prizes by completing "funbooks" of math problems such as hidden messages, puzzles, and pure arithmetic operations. Proceeds from this supplemental math program build an endowment fund to
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 The Math Behind Numb3rs  Wolfram Research, Inc.
Wolfram Demonstrations of the mathematics behind each CBS television broadcast of the FBI crime drama series NUMB3RS, from the pilot episode through season six: Structural Corruption, Prime Suspect, Sabotage, Bettor or Worse, Soft Target, Double Down,
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 MathBlues.com  Rafiq Ladhani
Stepbystep explanations and worked problems "all about the new SAT." Browse the weekly articles by topics such as algebra, trigonometry, geometry, statistics, and "math art." This SAT preparation site for students also includes message boards, weekly
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 Math Camps & Summer Programs  the Math Forum @ Drexel
An annotated list of math camps and summer programs. The list includes residential opportunities, some just for girls, in the states of California, Washington, Minnesota, New Jersey, Ohio, Maryland, and Massachusetts.
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 The Math Dude  Mike DeGraba
Mike DeGraba is the Math Dude, bringing engaging explanations to Algebra I students in this series of videos. The 5 to 7minute episodes are available via Flash on the web, podcast, RSS feed, and if you live in Montgomery County, MD, cable TV. Episodes
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 Matheatre  Sadie Bowman and Marc Gutman
Blog of the performers starring in "Calculus: The Musical!" This comic "review" blend of sketch comedy, musical theatre, and lecture about the concepts and history of calculus emerged as a teaching tool from the classroom of Gutman, who "... found that
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 The Mathemagician  Andrew Jeffrey
"Magic of Maths" shows interweave magic and comedy with "clear positive and motivational messages about the learning of maths." A former teacher and professional magician based in the UK, Jeffrey also sells original products such as Maths at the Drop
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 Mathematics Learning
A publishing company offering researchbased activity books, games, and software for grades preK8.
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 Mathematics Pentathlon  Pentathlon Institute
A program of interactive problemsolving games, supportive curricular and instructional activities, and assessment tools for students in grades K7. This motivational program strengthens basic math concepts and skills, aligns with national and state mathematics
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 The Mathematics Shed  Robert Smith
Instructional video clips that feature rhyming narration or singing, organized into different "sheds": calculation, brain teasers, shapes, fractions, mental calculation, counting, data, measuring, visual stimulus, and more. The "Maths Story" shed offers
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 Mathematiksoftware S I und SII (vorwiegend Shareware)  Monika Schwarze
Eine Zusammenstellung nützlicher Mathematikprogramme aus dem SharewareMarkt zur Aufarbeitung von Lernrückständen, Wiederholung und Stärkung der Sicherheit mathematischer Rechenroutinen. Vor allen die Programme für die SII dienen der Überprüfung gemachter
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 Math Is Everywhere  Sesame Workshop
See how to do math at home or on the go with your preschooler, and generally make math a part of your daily routines right from the start, with the creators of Sesame Street. Watch educational videos, play games, and get activities that feature Elmo,
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 Math Kangaroo  Maria Omelanczuk
Math Kangaroo's international "notselective competition" recognizes all students who participate in its 75 minutelong multiple choice test: "Each participant is seen as a winner and receives recognition and gifts on the test day in March." Open to any
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 mathlibs.org  Jessika Sobanski
Practice solving arithmetic word problems in "Mad Libs" format with Shockwave; explore fractions, probability, and rotation. Also, lessons in numbers, patterns, measurement, geometry, graphing, and probability.
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 Math Marvels  Mrs. O'Brien's Sequential III Honors math class
Students from Mrs. O'Brien's Sequential III Honors math class created this project with the intention of learning about a mathematician whose work has influenced the course of mathematics as well as curriculum. The pages feature information on the lives
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 Math Meet  Alex Kasman
Samples of the Annual College of Charleston Math Meet include PDFs of recent written tests; "AllDay Sprints" such as coded quotes, scramble, polymath, grids sprint, and "Blatant Propaganda Sprint"; math team relay; math brainstorm; and "marathons" 
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 MathMovesU  Raytheon Company
Raytheon's national initiative for promoting math in the middle grades. See how math "moves" celebrities such as Olympic speed skater Apolo Ohno; pro football player Willie McGinest; soccer player Mia Hamm; BMX biker Dave Mirra; WNBA star Lisa Leslie;
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 Math Problem Solving  Rakiya Rahman
Prealgebra and algebra tutorial articles, worksheets, and tips, including "how to do long multiplication using five different methods"; a mathematical glossary; funny mathematics videos, jokes, and tricks.
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 MathsChallenge.net  Colin Hughes
Problems to solve, plus codebreaking challenges, archived past problems, and links to other puzzle sites. Aimed primarily at puzzle solvers at KS3 and above (aged 11+), new challenges appear irregularly through the year. Latest lists most recent puzzles,
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