 GraphPanel  David Binger; Centre College
A Java application that supports the interactive editing of simple graphs with labels. The program can produce PostScript images of the graphs, and these PostScript files can be included directly in TeX documents or converted (using other programs) to
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 Graph Theory Tutorials  Chris K. Caldwell
A series of short interactive tutorials introducing the basic concepts of graph theory, designed with the needs of future high school teachers in mind and currently being used in math courses at the University of Tennessee at Martin. An Introduction to
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 GraphVisualizer  Terje Tysse
An applet that graphs simple functions, listed on the help page, over various user specified ranges.
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 Great Circle Mapper  Karl L. Swartz
Enter two locations on Earth (latitude and longitude, or airport codes) and see a map depicting the great circle path between them and a computation of the distance along that path. The Great Circle Mapper also displays the area within a given range of
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 Greg Egan's Home Page
Information, illustrations, and Java applets that supplement some of the works of the science fiction author. The Applets Gallery includes groups of rotations in three dimensions and in four dimensions; Escher, inspired by the artist's conflicting orientation
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 The Grid Game  Doug Ensley, Shippensburg University
A twoplayer game where the players alternate marking squares in a grid until there are none left. The first player chooses any single row or column and marks as many squares (at least one) as desired. The second player (the computer in this case) responds
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 Grid Puzzle  Rick Reed
A magic square Java applet that presents a 4x4 grid with mixedup numbers in it: drag individual numbers or flip, move, or swap rows and columns to make diagonals, rows, and columns add to 34.
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 Gridzzly.com  Rostislav Blaha
Make your own grid paper: select from among square, diamond, and hexagonal dots or lines, customizing spacing with the slider bar.
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 Groupe Fractales (INRIA)  Benoît Leblanc and Frédéric Raynal
A group of researchers studying the application of fractal techniques to complex systems, especially signal processing. Introduction to the theoretical aspects of fractal analysis; genetic algorithms; introduction to timescale analysis, in French; applications,
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 Groups32  John J. Wavrik, University of California at San Diego
A group theory calculator. Groups32 computes information about groups of orders 132; has a permutation group package; and provides a search for groups with given generators and relations. Site includes documentation as well as course handouts in PDF
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 Habitable Planet Interactive Labs  Annenberg Media
Use this set of interactive labs from the Annenberg Media course "The Habitable Planet" to explore the intersection of math and science. Labs tie together common concepts around the themes of carbon, demographics, disease, ecology, and energy. Each lab
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 Halloween Math Word Problems  Patricia Taverna
Addition word problems with a Halloween theme, as illustrated and written by Mrs. Taverna's second grade students. Mrs. Rollman's second graders posted their own problems at http://www2.lhric.org/pocantico/rollman/04/math.htm. Click and hold down over
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 The Handley Math Page  John Handley High School Mathematics Department
David Pleacher posted Problems of the Week in his classroom every week since 1968, and posted them online  with solutions and names of students who correctly solved them  from 1998 until his retirement in 2006. See also his lesson plans and worksheets,
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 Hands on Banking  Wells Fargo Bank NA
Selfpaced financial literacy lessons on budgeting, savings and checking, credit, investing, and more. Kids learn with space aliens Zing and Zoey; teens, with characters Angie and Alex; young adults, with live action age cohorts. This initiative of Wells
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 The Hank and Ted Game  Doug Ensley, Shippensburg University
Also known as "The Gambler's Ruin," this is a simple gambling game in which two parties flip a coin at a wager of one "marker" over and over until one of the parties is out of markers. The player who benefits from a toss of "heads" is Hank, and the other
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 Hearty Munching on Cardioids  Cut the Knot!, Alexander Bogomolny
A cardioid curve (roughly resembling a kidney bean) is the locus of points traced by a point on a moving circle that rolls without slipping on the outside of a circle of equal radius (explore the illustrative applets). An interactive column for MAA Online
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 Hekko Learning System  Hekko Corporation
The Hekko Learning System is an online math program based on the California state curriculum standards intended to provide a fun, challenging, and selfpaced educational experience for school and home use. Elementary schools are invited to particpate
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 Helena A. Verrill  Department of Mathematics, Louisiana State University
Notes, links, handouts, and other materials from the courses that Verrill teaches, such as Solving Discrete Problems, Calculus, Elliptic Curves, and Modular Forms. She also provides a Java applet for a wallpaper drawing program and stepbystep illustrations
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 HelpingWithMath.com  David Burns, HelpingWithMath.com
Worksheets, printable tables and charts, and online tools. Browse by subject or grade.
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 H.E.L.P. Program  Digital Directions International Inc.
Teaching math to English Language Learners (ELL), and Spanishspeaking students in particular, this internetbased, supplementary curriculum removes language barriers from the learning of math skills and math content via interactive lessons. Learn about
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 Heron's Calculation of Triangle Area (MSTE)  James P. Dildine; University of Illinois at UrbanaChampaign (UIUC)
The area of a triangle can be calculated using a formula attributed to Heron of Alexandria. This calculation requires that the lengths of all three sides be known. This activity includes an Excel file to calculate the area of a triangle, and Java and
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 Hexadecimal Headquarters  Intuitor
A comparison of base ten and base sixteen (hexadecimal), discussing why we should switch to hexadecimal. The site includes a hex clock, and explanations of both base ten and hexadecimal.
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 Hey Math!
Animated lessons on a wide range of topics, plus a repository of questions indexed by concept and grade. Many more lessons are available for purchase. Started in Chennai, India, by Nirmala Sankaran and Harsh Rajan, Hey Math is a partnership with the Millennium
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 Higher Bitesize: Maths  BBC Scotland Learning
"Tasty chunks of revision goodness..." Revision means studying, and this site aims to help students study, with online illustrations and materials, and interactive tests.
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 Highline Advanced Math Program  Don and Jerre McQuinn; Highline Council PTSA, Seattle, WA
A math enrichment program for students in grades 57. Lessons (first and second year) and a homework helper; Math Quizzer; definitions, and unit conversions. Also practice quizzes for the Olympiads.
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 High School Financial Planning Program  National Endowment for Financial Education (NEFE)
A sixunit program that provides teens with a greater understanding of and ability to manage their personal finances in the areas of goal setting, budgeting, and saving. With games, simulations, case studies, and interactive exercises, the site provides
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 High School Math Lessons  Joe Mercer
Lessons, worksheets, quizzes, and tests for high school algebra 1, algebra 2, geometry, precalculus, and AP Calculus AB written by a retired math teacher. Some of the resources, composed in SoftChalk's LessonBuilder, include Flash animations or download
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 High School Tutoring in Math  Roger Frye
A computer consultant interested in computational mathematics and tutoring. The site includes a demonstration of a prime number sieve and a calculator that adds and multiplies fractions.
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 Hilbert II  Michael Meyling
A predicate calculusbased proof checker, which can check proofs drawn from many different Internet sites.
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 Histogram Applet  R. Webster West, Dept. of Statistics, Univ. of South Carolina
An applet designed to teach students how bin widths (or the number of bins) affect a histogram. The histogram shown for the Old Faithful data set. Students interactively change the bin width by dragging the arrow underneath the bin width scale, and decide
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 Histogram Explorer  Eric Scheide, University of San Francisco
Histogram Explorer is a tool for understanding histograms and their statistics. Drag the bars of the applet's histogram to see their effect on the mean, median, mode, range, standard deviation, and IQ, which recalculate after each change; select normal,
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 HomeworkTV.com
Video lessons for grades 68 "presented by a live National Certified teacher who explains lessons in real motion." A topic list for each grade is available on the site.
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 Hooda Math  Michael and Teresa Edlavitch
Interactive games, math movies submitted by students, tutorials, and links for students and teachers.
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 Hopalong Image Generator  David Imai
This Java applet generates a unique fractal image before your eyes, based
on Martin's Hopalong algorithm. This mapping was described in an article by
A.K. Dewdney in the September 1986 issue of Scientific American magazine.
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 Hopfield Net for 8Queens Problem  Yuri Pryadkin
Given a standard chessboard and 8 chess queens, place them on the board so that no queen is on the line of attack of any other queen. The author's applet finds solutions to the general problem, with N queens on the NxN board. Tips and analysis of the
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 HostMath  Cui Wei
Input LaTeX, Tex, AMSmath or ASCIIMath, and this dynamic equation editor renders the notation for typesetting. HostMath formats for math, logic, symbols, Greek letters, trigonometry, arrows, and more.
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 HotEqn: The IMGless Equation Viewer  Lehrstuhl für Elektrische Steuerung und Regelung (ESR), RuhrUniversity Bochum
A Java applet for viewing and displaying mathematical equations on the Web. The applet uses LaTeX notation to code its equations. Font sizes are variable, so the applet can also be used to display inline equations.
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 Hotmath
Tutorial solutions for the oddnumbered homework problems in many U.S. math textbooks, algebra through calculus. A site designed to provide students with help in doing homework directly from their own books, and teachers with a resource to use in the
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 How Big?  Marsquest Online
Want some perspective on the sizes of things on the Red Planet? MarsQuest Online has developed interactive JavaScript for positioning familiar objects onto images taken by the Mars Global Surveyor spacecraft. The Links & Resources page features activities
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 HoweTwo Software  Leslie Howe
Over 70 interactive Windows programs that target specific concepts in secondary mathematics, written by a classroom teacher/programmer. Many free sample downloads are available. The programs are written in Microsoft Visual Basic. Site includes HTML generators,
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 How to Correctly View a Flatland Painting  Mark Schlatter
A paper with Java illustrations: Given a two dimensional painting of a three dimensional object, you can use geometry to find the ideal viewing locationthe position where the image appears most three dimensional. This site reviews that geometry (using
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 How to use a Chinese Abacus: A ComputerBased Tutorial  Jan G. Hogle
An abacus helps make abstract math concepts more concrete. This site includes a softwarebased tutorial to illustrate the basic use of an abacus. The tutorial presents a brief introduction; and illustrates, with graphics, text, and animation, how to represent
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 HTML with LaTeX  Alan Selby
Given HTML input that includes LaTeX encoded equations, the LaTeX2HotEqn applet generates webpages with typeset quality mathematics. With examples and documentation.
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 Hummer's Mind Reader  Interactive Mathematics Miscellany and Puzzles, Alexander Bogomolny
Java simulation of a magic trick invented in the 1950s by the magician Bob Hummer. Choose one of three coins. Swap the other two, then swap as many pairs as you like. When you're done, the computer will announce your selection. The explanation includes
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 HyperCube  Harmen van der Wal
A stereoscopic 4D Java game in and around the hypercube (stereoscopism optional). The page also includes instructions on how to see in four dimensions, and how to see stereograms (read "rotated cubes" for "twisted cubes" in the 4D piece). See also Point
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 HyperCuber  Greg Ferrar
A Java applet that lets you rotate a fourdimensional cube in four dimensions. HyperCuber is a freeware program for 680x0based Macintosh computers that displays and rotates wireframe objects of arbitrary dimension, like hypercubes (fourdimensional cubes).
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 HyperGami and JavaGami  Ann & Mike Eisenberg; Inst. of Cognitive Science, Univ. of Colorado, Boulder
HyperGami and JavaGami are software environments for designing and building paper sculpture. Choose from a number of starting polyhedra, which appear in a 3D window alongside a corresponding "folding net" in a 2D window. Employ both builtin features
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 HyperMath  Carl R. (Rod) Nave; Georgia State University
HyperMath uses concept maps to explore mathematics ideas and applications to physics and astronomy. Originally developed in HyperCard, HyperMath covers the topics of algebra, trigonometry, geometry, vectors, linear algebra, logarithms, exponents, calculus,
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 HyperPhysics  Carl R. (Rod) Nave; Georgia State University
HyperPhysics uses concept maps to explore physics ideas and applications. Originally developed in HyperCard, the networklike environment provides for numerical exploration in the form of active formula and standard problems implemented in Javascript.
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 Hypersonic Aerodynamics Index  NASA Glenn Research Center
Primers, some with animations or Java applets, on hypersonic and high supersonic flows  when air molecules break apart, producing an electrically charged plasma around aircraft. Large variations in air density and pressure occur because of shock waves,
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