 Hales Proves Hexagonal Honeycomb Conjecture (Math Chat)  Frank Morgan, MAA Online
Professor Thomas Hales of the University of Michigan has proven the Hexagonal Honeycomb Conjecture, which says that regular hexagons provide the leastperimeter way to enclose infinitely many unit areas in the plane. This may partly explain why hexagons
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 Hamilton's Math to Build On  Johnny & Margaret Hamilton
Simple, straightforward explanations, drawings, questions and answers from the book Math to Build On by Johnny & Margaret Hamilton (copyright 1993). Excerpts offer pages on: Angles, Degrees, Variables & Constants; Squaring Numbers; Square Roots;
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 Handheld Geometry  Nevil Hopley
A dynamic geometry site offering lessons and challenges for handheld devices and graphing calculators, including the Cabri™ Jr. Application for the Texas Instruments TI83+ and TI84+, and the TINspire™. The author offers to make users' contributions
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 Hand Made Manipulative Instructions  Margo Lynn Mankus
Pattern block cutouts: triangles, squares, smaller and larger rhombuses, trapezoids, and hexagons. Baseten blocks in sets of ones, tens, and hundreds; and basefive blocks in sets of ones, fives, and twentyfives. XYblock sets of X, X2, XY, Y, and Y2
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 Hands Across America (TEAMS)  Jeannie Toshima; TEAMS Distance Learning, Los Angeles County Office of Education
How far can we get across the United States if we all join hands and measure the length of the line? In 199495 7,164 participants yielded a total of 19,546.22 feet. Your students might want to put the information into a database, creating fields to compare
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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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 Handson Computer Activities For Teaching Math: Grades 38  Beverly Burnley
Purchase or request an evaluation copy (if you're an educator) of this book. Publisher's description: "Featuring more than 100 stepbystep activities that use common computer programs, such as Microsoft Word and Paint, to model concepts in five basic
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 HandsOn Equations  Henry Borenson
A visual and kinesthetic teaching system for introducing algebraic concepts to students in grades 38. Students physically represent and solve algebraic linear equations using game pieces consisting of pawns and numbered cubes. For families homeschooling,
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 handsonmath.com  Charles Gronberg
Handson geometry model building materials to purchase, tested and test marketed by the American Association for the Advancement of Science in the late 1990s with the intention of targeting atrisk middleschool students (minorities and girls). The
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 Handson Science Centers Worldwide  Mark W. Maimone
An extensive list of links to public museums with a strong emphasis on interactive science education, by continent: Africa, Asia, Australia, Europe, and North and South America, with other related links. Some reviews of North American museums are provided.
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 The Hand Squeeze: A Data Collection and Analysis Class Experiment  Cynthia Lanius
An experiment: measuring the amount of time that it takes for a hand squeeze to pass around a circle. Record, graph, and analyze the data, and make predictions about the time it would take for more people/greater distances.
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 Hard Questions About Practice  Richard F. Elmore
"Educators need to look closely at the organizational and instructional practices that affect the learning of students and adults in schools." From Educational Leadership, May 2002, Vol 59 No 8, pp 2225.
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 Harnessing Technology to Serve Adult Literacy: Math  David J. Rosen
Frequently Asked Questions on how to help adult literacy education (ABE/GED/ESL/ESOL) teachers and learners use computers, television, audio and video cassettes, and other electronic technology to solve learning and instructional problems: "Our students
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 Harold Reiter's Home Page  Harold Reiter, Department of Mathematics, University of North Carolina at Charlotte
Freely downloadable puzzles and problems from the founder of teachers circles and math clubs in Charlotte and Mecklenburg, longtime writer of MathCOUNTS questions, and member of the ETS/College Board CLEP (CollegeLevel Examination Program) Precalculus
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 Harry Bohan's Web Site
Site contains personal info (education, jobs, list of publications), hyperstudio stacks of K8 math programs (some available for download here, all available by sending the required number of HD disks to Harry Bohan), an extensive page on teaching multiplication,
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 HCPSS Family Mathematics Support Center  Howard County Public Schools
K12 math lessons, activities, enrichment tasks, vocabulary lists, and more, organized by grade level and academic quarter. Designed for parent and students, the Maryland school district collected these resources from third parties such as LearnZillion,
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 A Head for Numbers  Robert Kunzig, Discover Magazine
An article exploring the connections between our brains and numbers: what injuries to the brain have taught us about people's ability to calculate.
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 Hebrew Letters / Consonants  Amerisoft Inc.
A Hebrew letter and number chart from the At Home With Hebrew computer tutorial.
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 HegartyMaths  Colin Hegarty
Hundreds of narrated screencasts covering the UK's Key Stage 3, GCSE and ALevel curriculums, along with many past paper solution walkthroughs. Instructional videos — most for students; some for teachers — also available from the HegartyMaths
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 Helping with Homework  Math Forum, Teacher2Teacher FAQ
Answers to a frequently asked question: How can I help my child with math homework?
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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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 Help With Fractions  Uriel "Skip" Akers
Provides stepbystep instructions for adding, subtracting , multiplying and dividing fractions. Includes a fraction calculator.
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 A Hen and a Half  Math Forum, Ask Dr. Math Common Question
A selection of answers to questions about the rate of eggs laid by chickens: "If a chicken and a half lays an egg and a half in a day and a half ..."
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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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 Heron's Formula  Math Forum, Ask Dr. Math Common Question
A selection of answers to questions about Heron's formula, including proofs, derivations, and applications of it.
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 Hessport's Rubik Shop  Hessport's Rubik Shop
Buy Rubik's Cube, Rubik's Revenge (4 x 4 x 4), Rubik's Professor (5 x 5 x 5), Rubik's Magic, Rubik's Rings, Rubik's Shells, Rubik's UFO, Rubik's Mini (2 x 2 x 2), Rubik's Snake, Rubik's Tangle, Rubik's Triamid, Rubik's Double Tangram, Rubik's Bricks,
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 Heureka: páginas lúdicomatemáticas  Rodolfo Valeiras Reina
Home page of a Spanish math enthusiast from Cádiz, España. Calidociclos (a kaleidocycle is a ring of tetrahedra joined edge to edge; as you twist it inward or outward, the tessellations on the faces of the tetrahedra meet in new ways); Problemas
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 Hewlett Packard/University of Melbourne School Mathematics Competition  Tony Guttmann
Since 1972, a competition emphasizing mathematical insight and creativity. Download PDF files of competitions and solutions dating back to 1996, as organized into the three levels of junior, intermediate, and senior. Also, FAQs, entry form, and other
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 Hexa Trex  Bogusia Gierus
Find a path through all the tiles to make a math equation. Read more rules about the Hexa Trex puzzle, and challenge yourself to solve the new challenges that Gierus blogs regularly.
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 Hex Loop Puzzles  Erich's Puzzle Palace; Erich Friedman
Ten hexagonalgrid puzzles; can you fill in the correct path? Answers provided.
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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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 Highland Tessellations  Karen M. Stagge, Highland Middle School, Libertyville, IL
Tessellations A La Escher: an introductory unit based on MECC's Tesselmania! software and the graphics of M.C. Escher, to help students realize the importance of mathematics in the art world. Also links to work done by students at other schools.
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 HighQuality Mathematics Instruction: What Teachers Should Know  The IRIS Center
Click through descriptions of standardsbased curricula, evidencebased strategies, and effective practices for math teachers. See, in particular, the "Perspectives & Resources" module for questions and answers such as "What is highquality mathematics
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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 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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 HillsdaleLenaweeMonroe Math and Science Center
From eastern Michigan, USA. Interactive sessions and information on water studies for high schools, including data collection on frogs and toads, a virtual marsh tour, water quality studies, TI calculator programs, and links to math/science sites.
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 HippoCampus  Monterey Institute for Technology and Education
Video lessons in arithmetic, algebra and geometry, statistics and probability, calculus and advanced math. The Monterey Institute for Technology and Education also runs the National Repository of Online Courses (NROC) and NROC math.
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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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 Histoire des maths et des mathématiciens  Franck Duffaud
Duffaud, enseignant dans le 93, a dédié son site à l'histoire des maths.
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 The history of cartography
 MacTutor Math History Archives
Linked essay on how map making has played an important role in the development of mathematics.
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 The History Of Computing  Dept. of Computer Science, Virginia Tech
Index of the items in a collection of math history materials related to the history of computing by J. A. N. Lee, EditorinChief of the IEEE Annals of the History of Computing, constructed as part of the course materials for the "Professionalism in Computing"
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 The History of Mathematics
Notes from a History of Mathematics course given at the Univ. of South Australia and a Graduate Certificate in Mathematics Education project. Topics include a chronological study of the development of number from a European and Eastern perspective; the
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 History of Mathematics  David Joyce; Dept. of Mathematics & Computer Science, Clark University
History sources, books and articles online. Sources by region (Babylonia, Egypt, China, Greece, India, Arab sphere, Japan, and Europe); Books and other nonweb resources (organizations, bibliography of source books, journals, bibliographies and catalogues,
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 History of Mathematics (Mathematics Archives)  University of Tennessee, Knoxville (UTK)
An alphabetical list of some of the best sites for math history on the Web, part of the Math Archives' collections of Math Topics. Icons provide more information about level, interactivity of site, Java, and presence of images or links.
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 History of Science and Math
A "free, communitydriven Q&A" for those interested in the history and origins of science and mathematics. Post, answer, and vote up or down questions such as "Ancient Chinese numbering system," "What evidence is there that Fermat had a proof for
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 History of Science, Technology, and Medicine  WWW Virtual Library (WWWVL)
A searchable online service established to keep track of information facilities in the history of science, technology and medicine. Sites are available alphabetically or by scientific field, source, exhibitions, institutions, regions, a historical biographical
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 A history of time: 20th century time
 MacTutor Math History Archives
Linked essay on the dramatic changes in ideas about time in the 20th century.
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 A history of time: Classical time
 MacTutor Math History Archives
Linked essay on the central role time has played in mathematics from its very beginnings.
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 A history of Zero  MacTutor Math History Archives
Linked essay on the development of the concept of zero. There are two important but different uses of zero: one as a empty place indicator in our placevalue number system, and one as a number itself in the form we use it as 0. There are also different
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