 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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 Jacopo Notarstefano
Interactive visualizations and puzzles: "Turing's sunflower," which connects leaf arrangements and Fibonacci numbers; "HavelHakimi," which presents nodes and their degrees to construct into a graph; "Fourcoloring a Dodecahedron"; and a logic puzzle
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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'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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 Joel David Hamkins
Blog by a City University of New York (CUNY) professor who researches mathematical and philosophical logic, particularly set theory, with a focus on the mathematics and philosophy of the infinite. Posts, which date back to 2011, have included "The mateinn
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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 Jerrim
Publications, blog, and other resources by a University College London Reader in Educational and Social Statistics who has worked extensively with the OECD Programme for International Student Assessment (PISA) data. Jerrim has organized publications into
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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 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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 Journal of Urban Mathematics Education  David W. Stinson, EditorinChief
The Journal of Urban Mathematics Education (JUME) is a peer reviewed, openaccess, academic journal focused on research, pedagogy, and scholarship of mathematics in urban communities. K16 urban mathematics teachers and teacher educators are encouraged
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 Journey North  Annenberg Media
Register online (free) for a global study of wildlife migration. Read today's news, from monarch migrations to robin populations in the south; report sightings, search the site. Numerous supplemental materials are available online, and further materials
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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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 Joy of Problem Solving  Deepak Kulkarni
Math olympiad programs for elementary and middle school kids by a Ph. D. in computer science and former NASA researcher. See, in particular, the section of Kulkarni's site entitled "How to Work on Problems," which includes essays such as Problem Solving
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 JRPN: a PopUp Scientific Calculator  Bill Giel
A 35function virtual scientific calculator that uses Reverse Polish Notation for data entry, making it easy to perform chained calculations. It also features continuous (filebased) "memory" and 10 persistent storage registers. Styled to look like a
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 Judy's Applications
Various calculatortype programs, including: Judy's TenKey (calculator program which features an editable tape which automatically recalculates when you make changes among other features, and a free demo version is downloadable here), Judy's Conversions
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 Juggling by Number (MatheMUSEments!)  Ivars Peterson (Math Muse for Kids)
Mathematicians have invented a way to write down juggling patterns as sets of numbers. They look at the order in which balls are tossed into the air and then caught. Each toss or catch happens on a particular beat, as if the juggler were keeping time
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 JumpingJoey  Psysoed Dynamics LLC
Learn the number line by jumping or walking a 30foot long, durable canvas number line. Also available as a placemat with dice and a board game.
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 JuniorHighMath.com
Free printable worksheets from a middle school teacher: algebra, one variable; algebra with coefficient; twostep algebra with addition; twostep algebra with subtraction; exponents; Pythagorean Theorem; and circles.
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