 The Institute for Figuring  Margaret and Christine Wertheim, CoDirectors
"If mathematics is a language of pattern, its structures may be seen as the verses of a formal, yet fantastical poetics. Across the globe people have delighted in the harmonies of this language and the patterns discovered therein. These are the songs
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 Intelligent Tutor Math Educational Software, Inc.
The programs in the Intelligent Tutor software series contain tutorials designed to help students learn and master Grades 712 math subjects. The programs are designed with school versions for use in schools, and home versions for individuals in selfstudy
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 Interactive Geometry with JavaSketchPad  Bryan Dye; MathsNet
Java applets illustrate geometrical figures (circle, cuboid, equilateral, isosceles, and scalene triangles, kite, parallelogram, regular hexagon, octagon, pentagon, quadrilateral, square, rectangle, rhombus, trapezium); show what is meant by congruence,
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 Interactive Math  Christopher Henrich
Topics in recreational mathematics, including polyhedra, kaleidoscopes, magic squares, and trochoids, presented with interactive applets.
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 Interactive Mathematics Miscellany and Puzzles  Alexander Bogomolny
"The peculiar beauty of Mathematics lies in deduction, in the dependency of one fact upon another. The less expected a dependency is, the simpler the facts on which the deduction is based  the more beautiful is the result." This awardwinning site offers
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 Interactive Mathematics Program (IMP)  Key Curriculum Press
A fouryear integrated problembased secondary mathematics curriculum and professional development program for teachers that meets college entrance requirements and prepares students to use problemsolving skills in further education and on the job. Information
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 InteractiveMathTutor.com  Howard Heller
Fee services include oneonone tutoring, email helper, phone helper, and homework helper. Register for free worksheets and solutions. Math subjects include elementary math, algebra, geometry, trigonometry, integrated math, calculus, statistics, and
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 Interactives  Annenberg Media
Interactives from Annenberg Media provides educators and students with strategies, content, and activities that can enhance and improve students' skills in math, science, history, arts, and language. Math topics include: Geometry 3D Shapes, Math in Daily
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 International Mathematical Olympiad (IMO) / Olympiade internationale de mathématiques (OIM)
The World Championship Mathematics Competition for High School, which takes place each year in a different country. Its membership (by invitation only) has gradually expanded to over seventy countries from all five continents. Latest competition results;
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 Internet Math Challenge  Dept. of Mathematics, University of Idaho
A weekly K12 math challenge from the math department at the University of Idaho, discontinued in 2004. Past puzzles and solutions are available.
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 An Introduction to Estimation and Measurements (SMILE)  Christeen Brown, Robert Fulton Elementary
A lesson for grades 35 designed to teach students to convert ounces to pounds; measure liquids; describe measurements in sizes; measure volumes; understand the importance of knowing and using the measurements; observe shapes and sizes in measurements;
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 An Introduction To Volume (SMILE)  Linda James Woods, Harold Washington Elementary School
A lesson for grades 35 designed to teach students about volume, using a variety of containers, potting soil, popcorn, etc. From the Geometry and Measurement section of a collection of almost 200 single concept lessons by the Science and Mathematics Initiative
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 Investigations in Mathematics  Eric S. Rowland
Openended problems for high school and college students to "approach creatively and in their own way": Pascal's simplices ("What is the generalization of Pascal's triangle?"), Pythagorean triples, regular polygons ("What is the area of a regular polygon
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 iP  Interlocking Puzzles
Purchase hand crafted hardwood interlocking puzzles made with precision from domestic or exotic hardwoods. Altekruse, Burr, Pentominoe, Polyhedra, Rhombic, Stewart Coffin, Tetrahedron, and Wooden Knot puzzles. Order via email.
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 ISAWI Laboratory  Hasan Isawi
Geometria_descrittiva; La Cupola della Roccia  graphic representation of architectural plans; static and/or dynamic montage of any real or virtual image. Graphic representations for thesis and university examinations. Gallery of images.
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 IXL Learning
IXL provides free online practice, organized by grade levels K8 and aligned to state standards. Choose one math skill from among the hundreds offered, and submit your answer. Respond incorrectly, and click on the "explanation" button to learn more; get
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 Java 3d Viewer  Faceted and Wireframe Objects  Paul Flavin
A Java applet that lets you view and rotate the Platonic Solids and other faceted objects including approximations of the Moebius strip, a torus, a soccerball, a teapot and other objects. Accompanying pages describe related mathematical concepts used
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 Java Examples  Richard Koch; Dept. of Mathematics, Univ. of Oregon
Fractal and FourD, two Java programs with source code and standalone versions available. "Fractal" can display various selfsimilar objects. "Four Dimensions" displays regular solids in three and fourdimensional space. The solids can be rotated and
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 JavaSketchpad Center  Key Curriculum Press
JavaSketchpad is software that lets you interact with or publish on the Internet sketches from The Geometer's Sketchpad, a Dynamic Geometry exploration environment for Macintosh and PC computers. JavaSketchpad can be used to share geometry work with people
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 JavaSketchpad DR3 Gallery  Key Curriculum Press
JavaSketchpad is software that lets you publish sketches from The Geometer's Sketchpad on the Internet. If you have a Javacompatible Web browser, visit this demo gallery for some examples of JavaSketchpad in use: Centroid; Stereo Icosahedron; Hypercube;
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 John Edmark  Edmark
Videos, still images, and stereo photography of kinetic sculptures and transformable objects that "celebrate the patterns underlying space and growth ... [and reveal] ... the surprising structures hidden within apparently amorphous space."
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 John Mason's Projects  John Mason
Projects by the author of Thinking Mathematically and former director of the Centre for Mathematics Education: Structured Variation Grids and other animations and applets; studies in algebraic thinking; mathematical explorations; MEMEs (Meaning Enquiry
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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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 Juggling Drops and Descents (Organic Mathematics Proceedings)  Joe Buhler, Ron Graham
A discussion of the permutations f of the integers Z satisfying $f(x) \ge x$, with applications to juggling patterns. Demonstrations are included and the site includes QuickTime movies.
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 K12 Math  BTRware.com
Math concepts, subjects, exercises, and examples for grades K through 12.
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 K12 Teaching Materials (Mathematics Archives)  University of Tennessee, Knoxville (UTK)
An extensive list of Internet sites with significant collections of materials that can be used in the teaching of mathematics at the K12 level. Organized into categories: lesson plans, schools, software and other K12 Internet math sites.
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 Ka's Geometriepage & MatheGalerie: Grundschulmathematik  Monika Schwarze
Eine Seite zur Grundschulmathematik mit SoftwareTipps. Links zu Mathematikunterrichtseinheiten für Grundschulkinder der Klassen 1 bis Klasse 4; Freiarbeitsmaterialien und kleinen Unterrichtsprojekten. A German Web site for teachers and lovers of geometry,
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 Keith's Think Zone  Keith Enevoldsen
Fun math miscellany about number sets, ndimensional hyperspheres and hyperballs, big numbers, areas and volumes, angles — the revolution, shortcut arithmetic, and more. See, in particular, the brain teasers "deadly disease puzzler" and "the world's
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 Ken Brakke's home page
Home page of the Susquehanna University mathematics professor who coauthored The Physics of Microdroplets and developed Surface Evolver, a free interactive program for modeling liquid surfaces shaped by various forces and constraints. Brakke also offers
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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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 Kids' Place Brain Teasers  Houghton Mifflin Company
Math puzzles for grades 34, 56, and 7+. You don't need to be a math whiz to solve them, just to be patient and find different ways of looking at things. New puzzles and the answer to the previous week's puzzles are posted each Thursday. Helpful hints
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 The Klein Project
Revisiting the intent of Felix Klein's Elementary Mathematics from an Advanced Standpoint on the centenary of its publication, this IMU/ICMIcommissioned project aims to produce a book for upper secondary teachers that communicates the breadth and vitality
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 KS3 Maths Homework Series  Stafford Burndred; Pearson Publishing (U.K.)
A series of 6 homework packs providing 180 different homework sheets covering levels 38 of the UK National Curriculum (ages 1114). Each pack addresses a separate level, and exercises use a speed marking system so that a full class can be marked in about
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 La Biblio
Una biblioteca de textos electrónicos. Los índices adjuntos permiten navegar por una gran diversidad de temas, todos ellos relacionados con el mundo de las Matemáticas a un nivel de bachillerato o superior. De una
recopilación
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 Latitude and Longitude  Math Forum, Ask Dr. Math Common Question
A selection of answers to questions about latitude and longitude, such as determining the distance between two points on Earth; along with explanations of pitch, roll, and yaw.
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 Learning Epipolar Geometry  Sylvain Bougnoux
A discussion of camera angles, using demonstration applets that allow the user to manipulate lines of sight and planes of vision. With two views, things become interesting: if we know m and the projection of a point M onto a camera, its corresponding
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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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 Learn With Trek  NECTAR Foundation
Learn With Trek develops and markets curriculumbased mathematics software, developed by teachers, for grades K12. Each program uses engaging interactive technology to help students develop their math skills. Some products are designed as remediation
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 LearnX.com  Learning Express
Practice tests (e.g. the New York State 4th Grade Math Test) to download in PDF format; search for math or mathematics to find books to buy; browse math skillbuilding books.
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 Les Mathématiques  Gilles G. Jobin, Projet Diderot
Web resources, activities, lessons and tutorials for secondarylevel mathematics. Illustrated geometry theorems, with extensive use of the software package the Geometer's Sketchpad. Puzzles and games; algebra problems and adult education. Activités:
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 Lesson Study: A PCMI Experience  Tony Anderson, Jennifer Kumi Burkett, Gail Burrill, Joyce Frost, Jerry Gribble, Jill Ryerson, and Celeste Williams
An article written by the Japanese Lesson Study group from the 2003 Park City Mathematics Institute (PCMI) about their experience developing the lesson, "Studying Dimensionality Through a StairStep Fractal." With an explanation of the Japanese lesson
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 Library Video Company
Library Video Company offers a searchable, browseable catalog of video and CDROM products for mathematics instruction on the K12 level, from addition to variables. This resource for primary and high school math educators looking for curriculum enhancers
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 Lower School LEGO Projects  The Blake School, Minneapolis/Hopkins/Wayzata, MN
LEGO Logo projects are integrated into the science and computer curriculum of the Blake School. Students in the second grade study levers, third graders study pulleys, fourth graders study gears, and fifth graders combine their previous studies into a
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 Macalester College Problem of the Week  Stan Wagon; The Math Forum
Stan Wagon, a professor in the Mathematics and Computer Science Department at Macalester College, poses a mathematics problem to his students every week. The problems are meant to be accessible to firstyear college students, so very little background
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 Mandelbrot Competition  Greater Testing Concepts
A roundbyround math contest in the United States, the goal of which is to introduce high school students of all ability levels to accessible new topics in mathematics while providing stimulating, challenging problems. The team test portion of the contest
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 Manipula Math with Java  International Education Software (IES)
Hundreds of interactive Java applets for middle school through early college years on subjects such as geometry, calculus, trigonometry, linear transformations, vectors, complex numbers, and conics. Applets and animations often include introductions to
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 Maple au collège de Maisonneuve  Pierre Lantagne
Site personnel dédié à l'utilisation du logiciel Maple dans
l'apprentissage des mathématiques de niveau collégial: calcul différentiel
et intégral I, II et III, algèbre linéaire, etc. Nombreux documents Maple
d'introduction au logiciel et d'apprentissage
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 Matemática? Absolutamente!  Paulo Correia
Página de Matemática do professor Paulo Correia. Contém Recursos e
Materiais para o Ensino Secundário e ainda Humor e Curiosidades.
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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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 Math2.org (formerly Dave's Math Tables)  David Manura
A collection of useful searchable math reference tables, formatted especially for the Web. Tables cover topics in general math (number notation), algebra (identities, polynomials, exponents, etc.), geometry (areas, volumes, surface areas), trigonometry
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