 Irrational Numbers  Jim Loy
Pythagoras is said to have discovered irrational numbers, showing that the square root of 2 could not be expressed as any whole fraction m/n. Here's the proof...
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 Irregular Tetrahedron Formula (Ask Dr. Math FAQ)  Math Forum
Formula for finding the volume of an irregular tetrahedron. This will work for a regular tetrahedra also, but a simpler formula is available in that case.
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 Is a Circle a Polygon?  Math Forum, Ask Dr. Math Common Question
A selection of answers to questions about whether a circle is a polygon, whether it has zero, one, or an infinite number of edges, and more.
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 ISGEm: International Study Group on Ethnomathematics  Ron Eglash
A group that sponsors programs and business meetings at annual conferences of the National Council of Teachers of Mathematics (NCTM) in the United States, and at the International Congress of Mathematics Education (ICME)."Ethnomathematics" describes the
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 Islands & Divisions of Knowledge (Pattern Based Reason)  Alan Selby
Not seeing the difference between one and twoway implications is a common source of confusion in reading, writing and mathematics. Oneway implication rules can sometimes be put together to get further implication rules. One and twoway implications
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 Is Mathematical Teaching a Function of Time?  Andrej and Elena Cherkaev, eds.
A page of math humor, including definitions, anecdotes, math education jokes, theorems, puns, limerics, and links.
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 Isn't It a Great Time to Be Alive?  Rex Boggs
PDFs and Promethean ActivInspire flipchart files which survey the range of digital technology available to assist in the learning and teaching of mathematics. These free downloads accompanied the talk given by the veteran middle school math teacher to
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 It's Fourth Down and What Does the Bellman Equation Say? A DynamicProgramming Analysis of Football Strategy  David Romer, Department of Economics, University of California, Berkeley
PDF download of David Romer's working paper. Reviewing almost 20,000 first quarter plays of National Football League regular season games, Romer analyzed fourth down decisionmaking and the rarelyquestioned consensus that it's better to punt than to
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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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 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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 Jaap's Scratch Pad  Jaap Scherphuis
Java applets, generators, and solutions for sudoku, Rubik's Cube, "moving pieces" puzzles, permutation puzzles, and more, including sphere symmetries, polyform, Towers of Hanoi, and many lesser known puzzles from this collector. Scherphuis' articles range
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 jackmathsolutions.com  Jack Koenka
Freely download individual chapters of the AP Calculus AB textbook coauthored by Koenka and Roger Allen. Download problem of the week documents, sample test and assignments, notes, worksheets, and other instructional resources. Koenka invites students
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 Jaina mathematics  MacTutor Math History Archives
Linked essay on the period after the founding of Jainism up to around the time of Aryabhata in around 500 A.D., until recently thought to be a time of little mathematical activity in India. (Jainism is a religion and philosophy which was founded in India
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 James P. Dildine  James P. Dildine
Interactive math lessons for exploring parabolas, triangle areas, Pythagorean triples, triangle angle sums (powered by a Cabri Java applet), cancer and mathematics (image analysis, and determining the area and perimeter of nonregular figures), systems
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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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 Jamit Fractions  JAMIT Software
Software for learning fractions, for students from 8 years old to adults. Topics are presented in short lessons, each with references, examples, and a practice game that generates problems to be solved. A free version is on the Web; Part One may be purchased
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 JAN (Job Accommodation Network)  President's Committee on Employment of People with Disabilities
An international tollfree consulting service that provides information about job accommodations and the employability of people with functional limitations. JAN's mission is to assist in the hiring, retraining, retention or advancement of persons with
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 janko.at  Angela and Otto Janko
Puzzles, games, and Java applets on logic, number, and chess. See also the Jankos' Retrograde Analysis Corner and analyses of legal moves in chess.
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 Japanese Temari  Barb Seuss
Read about the history of this Asian needlework craft, find free patterns to stitch your own geometric designs on the sphere, browse online galleries of temari, and more.
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 The JASON Project
A yearround scientific expedition designed to excite and engage students in science and technology, and to motivate and provide professional development for teachers. The project mounts a twoweek scientific expedition each year. The team conducts research
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 Java Boutique Educational Applets  internet.com Corp.
Investigate or download various Java applets, including 3D viewers, calculators, applets to graph functions or data, and simulations, such as the bell curve and fractals. The source code for many applets may also be downloaded; a few applets are shareware
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 Java Components for Mathematics  Hobart and William Smith Colleges
Configurable mathematical software components written in the Java programming language and meant to be used on instructional Web pages as interactive illustrations, specialpurpose calculators, support for exercises, etc. The components in Version 1 are
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 JAVA Gallery of Interactive OnLine Geometry  The Geometry Center
Applets illustrating geometry concepts. WebEQ, Hyperbolic Triangles, Lorenz Simulation, OneDimensional Iteration, Tetris, Leap Fractal, Fractals from Iterated Function Systems, Kali: Wallpaper Patterns. Created by The Geometry Center.
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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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 Java Projects  John Lindsay Orr; Dept. of Mathematics & Statistics, Univ. of NebraskaLincoln
Grapher is a general purpose function graphing program. ZoomGrapher is a general purpose graphing program, with facility for zooming in on specified points. IntegGrapher demonstrates the definition of the integral in terms of successive approximations
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 Javascript School Math Toolkit  Jeff LeMieux
JavaScript Pythagorean solver, proportion problem solver, percent proportion problem solver, chord to circumference calculator, denominator to repeating decimal checker, subtraction worksheet generator, addition worksheet generator, multiplication worksheet
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 Jayden's Rescue  Vladimir Tumanov; Scholastic Canada Ltd. (pub)
A novel whose plot revolves around mathematical puzzles roughly for grades 46. The puzzles are in verse, and the solutions are provided following each puzzle. The three child protagonists have to solve these puzzles in order to save an imprisoned queen.
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 J. Digital Tutoring Services  Jason Hankins
Online tutoring and educational links and DVDs. Live tutoring available in northern Chicago, Illinois/Wisconsin area.
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 Jean Marie Linhart
Courses taught, outreach activities, teaching statement and philosophy, and more from this Lecturer at the University of Texas at Austin. See, in particular, Linhart's web page on Success at Math, a PDF of her Mathematical Models of a Zombie Outbreak
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 JEST  The Journal of Extraneous Scientific Topics  Russel and Rebecca Carlson
A newsletter for children: puzzles and an archive of past articles, Ask Dr. Iva (how does a banana work?), and the Homepage of Quadrant NQ.
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 J. Frederic Teubner, The Toymakers of JTEU  J. Frederic Teubner
See, in particular, the Reut·Reut 12x12 Transmagic Square. Also board, card, and dice games, magnets, tshirts, books and tapes, coloring books, an art gallery, and a millennium 2000 computer art calendar.
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 Jim Loy's Gambling Page  Jim Loy
This is a set of short articles about the risk of gambling, your probability of going bankrupt, and pyramid schemes.
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 Jim Loy's Logic Page  Jim Loy
This is a group of logic puzzles and musings upon selfreferential statements and the value of logic.
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 Jim Loy's Mathematics Page  Jim Loy
This is an informal collection of articles on many different mathematics problems. Topics include Algebra, Geometry, Calendars, Number Theory, and reviews of mathematicsrelated books. See also Jim Loy's Puzzle Page and Jim Loy's Logic Page.
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 Jim Loy's Puzzle Page  Jim Loy
This is a group of number, geometry, and logic puzzles with solutions, including "The Missing Dollar," "The Monty Hall Trap," and comments on the Tower of Hanoi.
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 Jim's GSP Library  Jim Wilson; Dept. of Mathematics Education, Univ. of Georgia
Geometer's Sketchpad (GSP) sketches to download, from a course on Algorithms and Computers in Mathematics Education: Centroid of a triangle; Orthocenter of a triangle; Circumcenter of a triangle; Circumcircle of a triangle; Incenter of a triangle, Incircle
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 Jiskha Homework Help  Math  Jiskha Homework Help
Submit math questions or answers to this homework help forum. Jiskha archives past math problems and solutions for searching or browsing in reverse chronological order.
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 Job Interview  Math Forum, Teacher2Teacher FAQ
Answers to a frequently asked question: What issues should a teacher think about before a job interview?
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 Jo Boaler
From the author of What's Math Got to Do with It?: How Parents and Teachers Can Help Children Learn to Love Their Least Favorite Subject. Watch a YouTube clip of Boaler teach using Inquiry Based Learning method, or click through her presentation entitled
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 John Allen Paulos
John Allen Paulos is a mathematician and author of the books Mathematics and Humor, I Think, Therefore I Laugh, Innumeracy  Mathematical Illiteracy and Its
Consequences, Beyond Numeracy  Ruminations of a Numbers Man, A Mathematician Reads the Newspaper,and
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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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 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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 John Olive's Home Page  John Olive, Department of Mathematics Education, The University of Georgia
Course descriptions and requirements for Computers in Mathematics Education and Investigations into the Teaching of Mathematics Grades 712. Recent articles, available online, include Computer Tools for Interactive Mathematical Activity in the Elementary
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 John Wiley & Sons, Inc.
John Wiley & Sons, Inc., develops, publishes, and sells products in print and electronic media for the educational, professional, scientific, technical, medical, and consumer markets worldwide. Search for a title among more than 11,000 listed in Wiley's
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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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 Join the Math Forum: A Math Education Community Center on the Internet  Math Forum
How to become a member and contribute to the Math Forum. Gain access to the best Math resources on the Internet while helping to build a bigger and better community.
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 Jones and Bartlett Publishers
Publisher of textbooks, professional and reference books, and multimedia products in a variety of disciplines including mathematics. Publications range from introductory to graduate level in the college market and from practitioners to specialists in
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 The Jose Vilson  José Luis Vilson
Blog by a math educator for a middle school in the Inwood and Washington Heights neighborhoods of New York. Posts, which date back to February, 2007, have included "On The Reason Why You May Only Get One Black Male Teacher Ever In Your Life (If At All),"
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 Journal for Research in Mathematics Education (JRME)  National Council of Teachers of Mathematics, Inc. (NCTM)
An official journal of the National Council of Teachers of Mathematics, devoted to the interests of teachers of mathematics and mathematics education at all levels  preschool through adult. The JRME is a forum for disciplined inquiry into the teaching
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 Journal of Mathematics Teacher Education  Kluwer
A journal devoted to topics and issues involving the education of teachers of mathematics, serving as a forum for critical analyses of innovative programs, research, technology, assessment, teaching diverse populations, policy matters, and developments
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