 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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 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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 História da Matemática  Centro de Competência Nónio da Malha Atlântica
Uma colecção de problemas de diferentes civilizações, ao longo de diferentes períodos da história. Contandose a origem e história de alguns problemas ou tipo de problemas. Cultúras incluem Egipto,
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 História da Matemática  história dos problemas  Maria João Lagarto
Uma colecção de problemas de diferentes civilizações, ao longo de diferentes períodos da história. Contandose a origem e história de alguns problemas ou tipo de problemas. Cultúras incluem Egipto,
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 HitTrackerOnline  Greg Rybarczyk
Hit Tracker "determines the true distance a home run travels by recreating the precise trajectory the ball followed during flight, and extending that trajectory all the way back to field level to allow 'measurement' of the home run." Hit Tracker's spreadsheet
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 Hoagies' Gifted Education Page  Carolyn K.
Research, reviews, professional and social organizations, internet explorations, and other resources for gifted children and their parents and educators. Math items available in all subsections of the site.
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 Hogwarts Express to Improved Problem Solving and Mathematical Communication  Judy Ann Brown
Download PDFs of problems based on the Harry Potter books by J.K. Rowling: Eight Digit Puzzle; House Flags; Secret Passageway; Wizard Cards Front; Wizard Cards Back; Coins; Bertie Beans; and Hogwarts Express Problem Solving Set.
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 Ho Math and Chess Learning Centre, Vancouver, BC, and affiliates  Frank Ho
Site features downloadable math and mathematical chess materials, information on the centers and the classes they offer locally, and franchising details for the centers.
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 Home : Classroom : Mathematics  R. Jerry Adams, Awesome Library
Links to Web resources for K12 math education and concerns, including math Standards. Discussions (ask a science or math expert, teacher's issues); games; lesson plans; project materials; papers for or about math education; classroom math projects.
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 Home of the BEDMAS: A Mathematical boardgame  Alagan Elavalagan
Each player forms an equation on the tile bar using number tiles of random
values. The players should take advantage of the number and operator tiles
to maximize their score.
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 A Homepage for New Math Teachers  Terri Husted
A page created by a middle school teacher to give new math teachers a few pointers and ideas to help with their teaching, focusing on "the qualities of good teachers and not just good programs." Includes: How to Start Making Connections; A Clear Lesson;
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 Homepage Michel Delord  Michel Delord
Une site opposé "à la spirale qui prétend faciliter la compréhension en allégeant les savoirs fondamentaux.... [et] à la justification de cette spirale qui sépare l'intelligence conceptuelle de ses manifestations
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 Home Page of Andrei Toom, André Toom  Andrei Toom, Department of Statistics, Federal University of Pernambuco, Recife, Brazil
The home page of one of the developers of the ToomCook, or Toom3 algorithm, a method of multiplying two large integers. Toom's Englishlanguage mathematics articles, published in journals such as the Journal of Statistical Physics, include "NonErgodic
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 Homepage of Torsten Sillke  Torsten Sillke
A collection of puzzles statements, with references, on a variety of topics: operations research, such as crossing the bridge; logic, including liars and truth tellers, mastermind, and age problems; lateral thinking, also known as "situation puzzles";
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 Home Page  Tony Roberts; Dept. of Mathematics and Computing, University of Southern Queensland, Australia
Links to recent research papers (titles, abstracts and electronic copies of recent research documents); software (computer routines to do various taks such as estimate fractal dimensions, solve DAEs, etc,, mainly in Matlab); teaching and other material
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 Home Run Numbers  Ivars Peterson (MathTrek)
The integers 61 and 62 have been very much in the news this summer. On the majorleague baseball front, Mark McGwire hit his 62nd home run on Sept. 8, and Sammy Sosa matched that total on Sept. 13, surpassing the record of 61 home runs in a season held
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 Home Schooling: Articles and Research  Carolyn K., Hoagies' Gifted Education Page
Articles and reports on homeschooling, in particular in the context of the education of gifted children.
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 Home Schooling  Beauregard Parish (Louisiana) Public Library
Links to sites with information about home schooling.
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 Homeschool Math
Free resources for homeschool math teaching: worksheet generator, curriculum corner, math textbook for grades 15, teaching tips, and a resource link list emphasizing interactive content and games.
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 Homeschool Math Blog  Maria Miller
Math blog aimed at helping teachers and homeschoolers teach math better. Includes math history topics, news, book reviews, resource links, updates to HomeschoolMath.net site, lesson ideas and more.
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 Homeschool Math Contests  Haddon Fox
A list of dozens of math contests open to individuals and which do not require gathering up teams  a requirement that often poses a challenge for homeschoolers. homeschoolmathcontests.com also lists many more regional meets sponsored by colleges and
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 HomeworkCentral  HomeworkCentral.com, Inc.
A free online learning environment designed to provide students, parents, and teachers with links to selected Internet sites. Includes a Mathematics Discussion Board and, for teachers, a lesson plan search (search for math).
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 Homework H(e)aven  Morris County Library
Recommendations, strategy, and pointers to search engines and favorite sites for finding reliable information for students' assignments.
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 Homework Help  Homeworkhelp.com, Inc.
Over 1000 tutorials, indexed for searching, for help with math, English, science, and ESL. Middle School math (grades 68) covers fractions, decimals, percents, graphing, functions, geometry, etc. High School math offers prealgebra, algebra I and II,
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