 Isotiles  John Everett
Isotiles are specially designed tiles, in just two triangular shapes, by
which a wide range of topics in geometry can be studied. Topics include: different types of angles; lines and angles; angles of a triangle; isosceles triangles; similar triangles;
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 IUP Annual Mathematics Competition  Gary Stoudt
A mathematics competition for high school students sponsored by Indiana University of Pennsylvania. Topics include algebra, geometry, and trigonometry. Registration forms may be found online, and previous competitions may be downloaded in PDF, PostScript,
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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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 James Poon Online Classroom  James Poon
Online instructional mathematics videos; a discussion forum; and articles on study skills.
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 JavaGSP!  Annie Fetter, the Math Forum
A short tutorial: everything you need to know to make your first JavaSketchpad page. A quick reference, then some other features, details, and considerations you might want to familiarize yourself with if you choose to incorporate Java GSP into some of
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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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 JavaSketchpad Files  Jenchung Chuan
Well over one hundred applets based on Geometer's Sketchpad drawings.
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 Jaz_math  Jasmine Walker
Blog by a Vermont teacher of ninth grade math (integrated algebra and geometry) and calculus. Posts, which date back to August, 2012, have included "'I Was Never Good At Math Either,'" "Twitter Math Joy," "TI83 Programming Project for Coordinate Geometry,"
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 Jeometry  Fabrizio Mancini
A geometry sketching device, written in Java and inspired by Cabri, for "proving" theorems simple geometric theorems that do not involve intersections between a line and a circle or between two circles.
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 Jim Wilson's Home Page  Dept. of Mathematics Education, Univ. of Georgia
Jim Wilson's page lists courses taught (e.g. Computers and Algorithms in Mathematics Education, Problem Solving in Mathematics), and papers on topics in geometry: Ratio of areas of two squares; Capturing Area and A Solution; Curve Building; Orthotravels;
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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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 Johnnie's Math Page  Johnnie Wilson
A directory of interactive math activities and tools for elementary and middle school children. The site is organized and presented so that children can easily find engaging and worthwhile math activities. The directory is organized by content: number,
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 Join the Dots: a Math Line Puzzle  Math Forum
Can you connect 9 dots laid out 3x3 using 4 straight lines, without lifting your pencil from the paper? Questions, hints, solution.
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 JustMaths  Seager, Christian; Khawaja, Faisal; Muldowney, Melanie
Video tutorials, practice exam questions, and other intervention resources created by three teachers practicing in the UK Midlands. Free resources include "trumps" and exam questions in algebra, data handling, geometry and measure, number, and more. Blog
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 K12 Math  BTRware.com
Math concepts, subjects, exercises, and examples for grades K through 12.
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 K12 Math Problems, Puzzles, Tips & Tricks  Math Forum
Links to calculation tips (Beat the Calculator, Divisibility Rules, Multiplication Tips), Math Problem sets, and math number and line puzzles.
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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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 Kangaroo Maths  Kangaroo Maths Ltd
Free maths resources to download in number, algebra, shape and space, and data handling. Assessments include homework sheets and "make the grade" tests; games and puzzles offer World Cup spreadsheet simulations. Kangaroo Maths also hosts Microsoft Word
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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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 Key Curriculum Press
Publisher of innovative texts and software applications for teaching mathematics including the Geometer's Sketchpad (dynamic geometry), Fathom (dynamic statistics), TinkerPlots (dynamic data exploration and analysis), Michael Serra's textbook Discovering
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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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 KidsNumbers  The KidsKnowIt Network
KidsNumbers' most popular singleplayer games count down against a clock: Add It Up, Lake Mathatobie (addition), Turkey Terminator (fractions), Number Drop (basic operations set to a Tetrislike challenge), St. Pat's Math Adventure (basic operations).
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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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 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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 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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 KSEG  Ilya Baran
KSEG is a Linux program for dynamically exploring Euclidean geometry. Create a construction, such as a triangle with a circumcenter; drag its vertices, and its circumcenter moves accordingly in real time. Features include a fast core to support large
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 Kungfu Math  Kungfu Interactive Pte Ltd
This online Singapore Math portal offers worksheets, quizzes, games, and more, from data analysis, geometry, measurement, mental sums, and whole numbers to algebra, distancespeedtime, fractions, heuristics questions, percentages, and ratios.
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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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 Launch into Math  C. Halter
A project created to further student understanding about the Internet, its resources, and the NASA Space Shuttle program. SpaceMath activities are provided for geometry (measure area and distance in space photographs); algebra (use the math that keeps
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 Álbumes Ilustrados Sobre Ciencia  Verónica Navarro
Álbumes ilustrados de geometría y arte abstracto como lo de Joan Miró, Paul Klee, y Wassily Kandinsky: La rebelión de las formas hace un itinerario por la geometría, la física, y el arte en un intento de reflexionar
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 LearnBop  LearnBop INC.
Oneonone online tutoring for students; infographic progress reports for their teachers and parents. See, in particular, LearnBop's autoscoring playlists of algebra and other math problems, which offer "ask for help" buttons and stepbystep guidance.
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 Learn.co.uk  Guardian Education Interactive Ltd.
Interactive resources for learners to support Great Britian's national curriculum. Selfguided lessons, with glossaries and selfassessments, for key stage 2, key stage 3, or key stage 4 cover numbers; shape, space, and measurement; handling data; algebra,
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 Learning by Logic: Total Surface Area (SMILE)  Carolyne Boyd, Bennett Elementary School
A lesson designed to teach students to calculate the area of plane surfaces using the formulas for the area of a square, rectangle, and triangle; develop the formula for calculating (and calculate) the total surface area of a cube and a rectangular prism;
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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 Math  Annenberg Media
The Annenberg Foundation and the Corporation for Public Broadcasting (CPB) use media and telecommunications to advance excellent teaching in American schools. Video programs with coordinated Web and print materials are offered for the professional development
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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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 Leigh Nataro  YouTube  Leigh Nataro
Brief narrated screencasts for algebra, geometry, AP Statistics, and other high school math subjects, often using Fathom software and TINSpire technology.
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 Leone Learning Systems  TJ Leone, Leone Learning Systems, Inc.
Online courses for kids anywhere, and local teaching and tutoring services for students in Chicago and the Northern Suburbs of Chicagoland. LLS provides a free geometry software package for children age six and up, and free resources for teachers and
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 Les Hexamys  Raymond Pouzergues
Les Hexagrammes Mystiques de Pascal: a theorem with which one can make almost all the problems of geometry. In French.
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 Le site des maths à petites doses  SaintMartin Arnaud
Supplementary information and explanations of various mathematical topics, often illustrated with figures and JavaScript, as well as some sample problems and multiplechoice quizzes. In French.
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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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 LessonSketch  The Regents of the University of Michigan
A suite of animated sketches of geometry and algebra instruction, and forum for ongoing conversations about mathematics instruction, for practicebased professional development of secondary mathematics teachers. LessonSketch "supports the creation, examination,
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 LessonSnips  LessonSnips
Free lesson plans, worksheets, and activities.
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 Let's Play Math!  Denise Gaskins
"As a homeschool mom who loves math, I want to help other homeschoolers see the variety and richness of the subject.... I hope this blog will be a place where we can play around with ideas about learning, teaching, and understanding math. (For me, it
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 A Level Mathematics Resource Site  Frederick Koh
Solved problem sets, summary handouts, and examination advice for A level Math students from a tutor with twelve years of teaching experience.
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 Library of Math  David A. Smith
Definitions, comments, examples, propositions, and proofs on Business Algebra, Business Calculus, Calculus I, Calculus III, Euclidean Geometry, Financial Mathematics, Group Theory, and Trigonometry. The Library of Math website was designed to be a "browserquiet"
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