 The World of Geometric Toy  Akira Nishihara
Play with animations and applets of Buckminster Fuller's Tensegrity and the Indian Ball (also known as the flexisphere), as well as wireframe renderings of the torus, the magic ring, the toroflux, the reversible polyhedron, and other objects. Nishihira
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 The World of Trotter Math  Terry Trotter, Escuela Americana, San Salvador, El Salvador
A page of problems, problem sheets, and investigations, with links to image files of an inclass math newsletter, Trotter Math News. Of particular interest to the author are numbers: happy and dizzy numbers; palindromes; super squares; perfect, amicable,
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 wrotniak.net  J. Andrzej Wrotniak
Includes shareware and freeware programs for Windows written by Wrotniak: scientific and regular calculators, a spherical geometry calculator, a logic and strategy game, a statistics graphing program, and a simple program to compute the area of a polygon.
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 www.multiplication.com  Krimsten Publishing
Ideas and products to help students understand multiplication and learn their multiplication facts. In Krimsten's rhyming method, for example, visualize a product such as 3 × 4 = 12 as a story about a tree ("three"), door ("four"), and elf ("twelve").
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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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 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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 yyGrams Books: Books, Games, Puzzles  David Zethmayr
Zethmayr presents boundary mathematics to young children, introducing the ideas of logic, proof, and algebra far earlier than is usually attempted. Books, games, and puzzles on this site reinforce these ideas, and Zethmayr presents a seminar and children's
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 Zeno
School and community programs that "reframe math as fun and relevant" through games and other activities. See, in particular, the freely downloadable PDFs for lesson plans of math games such as 10 Pin Limbo, Twinks, and Farkle. Based in Seattle, this
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 Zoltan Dienes' Web Site  Zoltan Dienes
"Math through play" from a developer of psychomathematics, multibase blocks, and the sixstage theory of learning mathematics. Freely download PDFs of Dienes' Ruritania stories and math games such as Strip Mathematics, Circular Villages, Six Stages with
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 Zome System  Zometool, Inc.
Available in kits of various sizes, Zometool is a 31zone design tool and educational toy for kids, hobbyists, students, teachers and researchers. Precisionmolded in ABS plastic, Zometool models spatial structures representing hyperspaces of up to 31
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 Zooba Island  Vrilliance Solutions
Free Flash games for children aged 7 to 12 which "inject fun and excitement into learning mathematics." Developed in consultation with Singapore's Ministry of Education Curriculum Planning Department around the Singapore mathematics curriculum, games
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 Z's Roguelike Stuff  Zeno Rogue
Mathematical games and projects include HyperRogue, a treasurecollecting, goblinkilling adventure set in nonEuclidean space  specifically, a hyperbolic plane of negative curvature filled with elixirs and slime beasts; and Hydra Slayer, which begins
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 Zêtre  Arte Merritt
A card game for the whole family that combines math, an element of chance, and a time limit. Players can compete against each other, against the clock, or against themselves. Zetre helps enhance players' math skills, including their knowledge of the order
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