 Horology: The Index  Fortunat MuellerMaerki
Internet resources on clocks and time: directories, dictionaries, glossaries, etc.; organizations, information sources (horological homepages; email addresses for cyber horologists; other electronic media: newsgroups, directories, ezines, mail lists,
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 Hotel Infinity (MegaMath)  Nancy Casey; Los Alamos National Laboratory
Will a hotel with an infinite number of rooms always have a vacancy? Students develop number sense, use numbers and number relationships in problemsolving situations, and communicate the reasoning used in solving these problems. Key concepts include
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 Hotlist of K12 Internet School Sites  Gleason Sackman, GSN
A comprehensive listing of K12 school web sites, organized by state.
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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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 HOT Math  Pauline Vos
Handson tasks in the mathematics classroom, a resource site for teachers of students around 14 years of age. Among the topics are angles, symmetry, scale drawing, balance algebra, tables, combinations, statistics, probability, reasoning, finding rules
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 HOTmaths  HOTmaths Pty Ltd
HOTMaths' interactive online math learning and teaching resources include interactive activities, a math dictionary, and Scorcher, an online basic mental arithmetic skillsbuilding competition. All content aligns with Australia's early secondary school
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 The Hot Tub: Interpreting Graphs  Cynthia Lanius
Questions to answer about a graph... Notice the connection between the slope of the lines and the rate of change of the water depth. On what segments is the slope positive, and the water depth increasing? negative, and the water depth decreasing? On what
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 Houston Area RealTime Traffic Report  Susan Boone
Students calculate the time needed to travel a certain distance given the rate of speed with data collected using "realtime" traffic maps of the greater Houston area. Over a period of one week, one month, and one school year, traffic patterns are studied
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 How Banks Work  HowStuffWorks
An illustrated article describing the functions of banks, what you would have to do to start your own bank, and why we should (or shouldn't) trust them with our hard earned cash.
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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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 How do we know about Greek mathematicians?  MacTutor Math History Archives
Linked essay examining how the dates of Diocles given in the MacTutor archive have been determined, and other ways to gain information about the ancient Greek mathematicians, with references and other related web sites.
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 How do we know about Greek mathematics?  MacTutor Math History Archives
Linked essay illustrating the way that Greek mathematical texts have come down to us by looking first at perhaps the most famous example, Euclid's Elements, and Archimedes' palimpsest, with references and other related web sites.
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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 Everyday Things Are Made  Alliance for Innovative Manufacturing at Stanford
An introductory website for students of all ages showing how various items are made. It covers over 40 different products and manufacturing processes, and includes almost 4 hours of manufacturing video. Due to the amount of video, it is optimally viewed
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 How Far Is It?  Bali Online
This service uses data from the U.S. Census and a supplementary list of cities around the world to find the latitude and longitude of two places, and then calculates the distance between them (as the crow flies). It also provides a map showing the two
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 How Long Is A Year?  Jim Loy
The exact length of a year, and how to figure it out using the earth, the sun, and the stars, with two observations on consecutive nights.
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 How Many? A Dictionary of Units of Measurement  Russ Rowlett; University of North Carolina at Chapel Hill
A dictionary of both metric (SI) and English measurement units, with history, links to related sites, and a bibliography.
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 How Many Animals?  Math Forum, Ask Dr. Math Common Question
A selection of answers to questions such as "Joe counts 48 heads and 134 legs among the chickens and dogs on his farm...."
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 How Students Learn: History, Math, and Science in the Classroom  M. Suzanne Donovan and John D. Bransford, National Academies Press
A volume that uses the latest research on cognition, teaching, and learning to address the practical questions that confront every classroom teacher. Leading educators explain in detail how they developed successful curricula and teaching approaches,
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 How Stuff Works
A site devoted to explaining the world in a way that is both informative and entertaining. Content is designed to be understandable for people of all ages and education levels.
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 How Things Work  Louis A. Bloomfield
An archive of answers to physics questions sent by readers. "Think of this site as a radio callin program that's being held on the WWW instead of the radio. If you ask how something works, using the button below, I'll try to provide an explanation. You'll
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 How To Be A Little Gauss  Jim Loy
There is a story about Carl Friedrich Gauss. Supposedly, when he was a little boy, his teacher asked the class to add up the numbers one through a hundred (1+2+3 etc., all the way up to 100)... To the teacher's annoyance, little Gauss came up with the
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 How To Code Information With Error Detection  University of Toronto Mathematics Network
A short essay and a description of "two out of five code," a special case of Hamming code.
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 How to Fix an Election  Ivars Peterson (MathTrek)
Voting sounds like a simple matter. Just pick a candidate, then count the ballots and announce the tally. When there are three or more candidates (or choices), however, the results may not actually reflect the true preferences of the voters.
Suppose
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 How to Knit a Moebius Band (Geometry and the Imagination)  Conway, Doyle, Gilman, Thurston; The Geometry Center
Directions for using two colors to knit a band that can be cut apart into a Moebius strip, expanded by Maria IanoFletcher from an original recipe by Miles Reid.
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 How to Lace Like an Ace (MatheMUSEments!)  Ivars Peterson (Math Muse for Kids)
One of your sneakers has a broken shoelace. You want to replace it, but the only laces you have around are much shorter. Is there a way to lace your shoes so that you can use the shorter laces? There are three common ways to lace shoes: American (or standard)
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 Howto Series  ERIC/AE; Bruce Thompson, Texas A&M Univ.
This is a set of online, fulltext books and booklets addressing practical evaluation, research, measurement, and statistical issues. The series started as a joint project of ERIC/AE and Bruce Thompson, Texas A&M University. We have since added other
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 How to Solve a Rubik's Cube Guide for Beginners  John Wade
An illustrated guide to solving Rubik's cube in seven steps.
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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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 HowTown.com  Lance Pettit
How to do practically everything in 10 steps or less. Submit your own HowTo, read others, or ask a question using the Web form provided.
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 How to Write Checks  Timothy Liptrap, Stocks, Bonds and More, Inc.
Purchase a 68page ebook with a complete system to help children learn how to write checks, balance a checkbook, and problem solve. Math skills are used in all calculations, when writing checks, when balancing checkbooks and in finding errors.
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 HubbleSite  Space Telescope Science Institute (STScI)
The home on the Web of the Hubble Space Telescope, a NASA Origins mission that seeks answers to fundamental questions about the universe and our place in it. Features include: Newscenter (search, by year or category, an indexed catalog of Hubble pictures,
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 The Huexotzinco Codex  Library of Congress
In this lesson, students analyze a set of pictograph documents created by native peoples of Puebla, Mexico in 1531. Then they take on the role of historians, studying the documents, decoding images, tabulating quantities of goods paid to the local government,
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 Hufnagel's Software  Hank Hufnagel
Math games that reinforce basic operations and symmetry: Mouse Math, SpiroMath, and SymmeToy.
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 Humanistic Mathematics  Mathematics Education at The Math Forum
The idea that teaching, learning, and creating mathematics issues from the same psyche as literature, aesthetics, and music has attracted, since 1986, a worldwide network of people who share this belief. The existence of the Humanistic Mathematics Network
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 Human Research Program Education and Outreach Project  NASA  Johnson Space Center
This project strives to reach diverse communities, inspire a new generation of scientists and engineers, and encourage future space explorers. Browse all of its programs through the site above. One of the project's areas of focus is to develop supplemental
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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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 HungHsi Wu's Home Page  HungHsi Wu
Articles on the Common Core Mathematics Standards (CCSS) and math education in general, such as "The impact of Common Core Standards on the mathematics education of teachers," "Bringing the Common Core State Mathematics Standards to Life" (published in
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 Hungry Frog Software  Science Education Software Inc. (SESI)
Educational software for Windows 95/NT and Apple Macintosh  Math, Chemistry 512, Latin/Greek HS & College, and languages, 412 (French, Spanish, Italian, German). All of the Hungry Frog games are based on the same fundamental game scenario: frogs
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 Hunting e  Ivars Peterson (MathTrek)
Lagging far behind in the celebrity sweepstakes is the number known as e. Carried to 20 decimal places, e is 2.71828 18284 59045 23536. Only 50,000,817 of its decimal digits have been computed so far  though there are unconfirmed reports that 1 billion
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 Hydroponics Project Page  Holtz, Cooper; Levering School, Philadelphia, PA
A project plan for a seventh grade class that involves growing different hydroponic gardens and measuring and graphing the results. Included on this site are: project summary reports, pictures of the kids and the gardens, results chart, movie, standards
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 Hypatia of Alexandria: Mathematician, Astronomer, and Philosopher  David Fideler; Alexandria on the World Wide Web
A brief biographical sketch, along with three source materials: The Life of Hypatia from The Suda; The Life of Hypatia by Socrates Scholasticus; and The Life of Hypatia by John, Bishop of Nikiu. (This Christian writer spoke with approval of the murder
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 Hyperbolic Geometry (Geometry and the Imagination)  Conway, Doyle, Gilman, Thurston; The Geometry Center
A closed polyhedron cannot be made by snapping together seven equilateral triangles so that there are seven at every vertex, but if you persist and continue to snap together seven triangles at each vertex, you will actually construct an approximate model
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 The Hyperbolic Surface Activity Page  Dr. Tom Holroyd
This page contains a postscript file and directions for constructing
a hyperbolic plane tesselation using paper, scissors, and tape. It
demonstrates why hexagons tile flat space, but heptagons require
curved space (and helps to introduce nonEuclidean
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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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 Hypergami (Geometry Forum Summer Institute)  Michael Eisenberg, Ann Nishioka
A program for the creation of paper sculptures of various types  particularly polyhedral models and the larger, multipart sculptures that can be created from polyhedra. Description of a Geometry Forum Institute program (summer 1995).
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 Hypermedia Textbook for Grades 612 (MathMol)  NYU/ACF Scientific Visualization Laboratory
Designed for middle school students, but also useful for students of high school chemistry. Introductory concepts: mass, weight, volume, density, scientific notation, our 3dimensional world, VRML, geometry quiz, the geometry of 2 and 3 dimensions, and
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 IAEPedia  Information Age Education (IAE); The Science Factory
IAE, founded by Dave Moursund, is a nonprofit organization that provides free materials for preservice and inservice teachers. It focuses on improving education at all levels and throughout the world. The IAEPedia is a wiki page about its educational
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 I Choose Math  Justin Lanier
Blog by a high school teacher in Brooklyn Heights. Posts, which date back to August, 2011, have included "SBG: Affective Quizzing," "FreeChoice Time: Origins," "Introducing Proof Using Formal Systems," and "Math is Personal: A smOOC about Meaning, Sharing,
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 ICME10 Denmark
The 10th International Congress on Mathematical Education will be held in Copenhagen, Denmark, July 411, 2004. The aim is to show what is happening in mathematics education worldwide, in terms of research as well as teaching practices; exchange information
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