 GeomeTree  John Miller
Explore fractals with this treedrawing app for iPod, iPhone, and iPad. Choose the number of branches, angle between branches, and the common ratio of the levels in the tree. See, in particular, the exercises and open questions on GeomeTree for the
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 Geometric Arts  Ghee Beom "Quincy" Kim
A site dedicated to geometry and visual perception: patterns, fractals, structures, rotations, spirographs, optical arts, knots, and more. Some constructions include the artist's reflections, instructions, and links to related sites and interactive applets.
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 Geometric Formulas (Ask Dr. Math FAQ)  Math Forum
Formulas for twodimensional figures: triangle (equilateral, isosceles, right, scalene); quadrilateral (general, square, rectangle, parallelogram, rhombus, trapezoid, kite, cyclic and cyclicinscriptable); regular polygon; circle (arc, segment, sector);
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 Geometric Sculpture  Elias Wakan
Sculpture inspired by a love of geometric form.
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 GeometriX  Benko Computer Software Ltd., Turkey
Windowsbased geometric drawing, presentation, and testing system for primary to high schools. Make worksheets using the commercial software, and your students can view them on their computers or on the web using the free viewer software. Trial version
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 geometryannouncements  Math Forum
A discussion group accessible as a Webbased discussion, a mailing list, or a Usenet newsgroup, for information about lectures, announcements, special meetings, and upcoming events concerning geometry. Read and search archived messages; and register to
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 Geometry Discussion Groups  Math Forum
A gateway to the archives of the Math Forum's online electronic community comprising eight geometry discussion groups for all those interested in geometry. Access current news or follow a link to threaded past discussions to browse or search the archive
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 Geometry Gallery of Imaginary Animals (TEAMS)  Jeannie Toshima; TEAMS Distance Learning, Los Angeles County Office of Education
Students choose geometry terms and create drawings of imaginary animals from those geometric shapes. In writing, they describe their appearances, behaviors, and habitats. They send their completed drawings and stories to Jeannie to include in her Geometry
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 geometryinstitutes  Math Forum
A discussion group accessible as a Webbased discussion, a mailing list, or a Usenet newsgroup. Postings include planning for and information about geometry institutes held around the country. The Forum's teacher workshops hold discussions on this group
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 Geometry On the Sphere (Geometry and the Imagination)  Conway, Doyle, Gilman, Thurston; The Geometry Center
Great circles on the sphere are the analogs of straight lines in the plane. Such curves are often called geodesics. A spherical triangle is a region of the sphere bounded by three arcs of geodesics... Geometry on the surface of the sphere will come in
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 Geometry Playground  Exploratorium
An exhibit from San Francisco's Exploratorium. Peoplesized exhibits let you use your hands, brain, and body to play with physical demonstrations of geometry concepts. Exhibits fall under the categories of seeing, moving, and fitting things together,
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 geometryprecollege  Math Forum
A discussion group accessible as a Webbased discussion, a mailing list, or a Usenet newsgroup, for discussions concerning school geometry curricula, teaching geometry, new software and texts, problems for students, and supplementary materials such as
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 Geometry through Art  Norman Shapiro
Lesson ideas, facilitation suggestions, lists of materials needed, and handouts to photocopy. Norman Shapiro focuses on the student as investigator, learning through doing, and using perception to stimulate the motivation for more developed concepts and
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 Geometry Turned On: Dynamic Software in Learning, Teaching, and Research  J. King and D. Schattschneider, Editors
This book contains twentysix papers about aspects of dynamic software for geometry. The book does not contain software itself, but this site includes downloadable files for many of the papers in the book. For a discussion of what the book is about, see
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 German Language Math Resources  Math Forum
Mathematics and math education resources available online in German, collected by the Math Forum. Sites are organized by: Research Centers, Articles and Publications, Software, and Other Educational Resources.
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 Getsmarter.org  Council on Competitiveness
A free web site designed to help improve math and science education. Interactive quizzes, games, and tutorials allow students to learn more about specific topics and improve their skills. MSTV, a series of interactive modules, shows how math and science
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 Getting Across the River  Math Forum, Ask Dr. Math Common Question
A selection of answers to questions such as "A man has a goat, a wolf and a cabbage. He must cross a river in a boat that will only carry one item at a time...."
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 Getting To Know You (SMILE)  Kathy Koval, Randolph School
A lesson for any grade designed to teach students to use a ruler and measure accurately to the nearest inch; draw and label properly different graphs (line, pie, bar, pictograph); estimate/record measurement on a number line using intervals; and collect
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 GFBrandenburg's Blog  Guy Brandenburg
In his opening post, Brandenburg wrote, "I have been doing some research on educational progress (or lack thereof) in the Washington, DC school system before and after the reign of our mediadarling school Chancellor, Michelle Rhee...." The retired high
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 Gifted and ADD/ADHD  Carolyn K., Hoagies' Gifted Education Page
Articles and reports on attention deficit disorder and attention deficit hyperactivity disorder, primarily as related to the education of gifted children.
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 Gifted Children with Special Needs: Articles and Research  Carolyn K., Hoagies' Gifted Education Page
Articles and reports on children who are learning disabled, in particular in the context of those who are also gifted children.
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 Gifted LearningLinks  Center for Talent Development, Northwestern University
Gifted LearningLinks offers academically talented students in Kindergarten through Grade 12 the opportunity to take enrichment, high school honors, AP and university credit courses onlinefrom wherever they are, whenever they want, at a pace appropriate
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 Gifted Programs: Articles and Research  Carolyn K., Hoagies' Gifted Education Page
Articles and reports on education programs for gifted children: schools for the gifted, early college, Saturday and summer programs, and talent searches.
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 Giggle Learn: Addition and Subtraction Math Fact Games  Laurie Laurendeau, Giggle Learn LLC
"Giggle Facts" is a collection of 50 fun games to teach children addition and subtraction math facts, entirely through board games, games with dice, dominoes, and playing cards. The facts are introduced in a stepbystep manner, along with specific strategies
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 Girls' Angle
Girls' Angle is a math club for girls and a supportive community for all girls and women engaged in the study, use and creation of mathematics. By mentoring, publishing the bimonthly Bulletin, and solving math problems on commission, networking professional
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 Girls' Attitudes, SelfExpectations, and Performance in Math  Michelle Maraffi; Math Forum
For those concerned about girls' negative attitudes and expectations in the study of mathematics who want to improve and increase girls' performance and learning in math: an annotated bibliography of articles and studies designed to give teachers and
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 GirlTECH  Cynthia Lanius; Center for Research on Parallel Computation (CRPC)
GirlTECH was a teacher training and student council program that encouraged young women to pursue careers in mathematics and science, offering intensive technology training to explore innovative teaching strategies for gender equity in the classroom through
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 Glad2Teach  Glad2Teach.com
Webbased live math tutoring for students in grades 412. Its objective is to make math learnerfriendly for the students, based on the Constructive Theory of Learning. It uses real life examples and anecdotes to put the math topic in context for the
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 Global Connections Online  National Semiconductor Corporation
A Webbased workshop that provides teachers with knowledge, skills, and support to incorporate the Internet in their classrooms and curricula. Learning objectives include explaining basic concepts relating to the Internet; using the features of a web
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 Global Math Department  Megan HayesGolding, community organizer
Professional development among math teachers sharing what they've learned "... 'cause we don't want our classes to suck the energy from students." Files have included "ZERO_Hit_Me_Game," "TINSpire_Quick_Tip," and "Zero_Game_Instructions." BigMarker community
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 The Global Schoolhouse  Global SchoolNet Foundation (GSN)
A site for teachers, parents, teens, and kids, with articles on telecommunication in the classroom, contests, events, projects, an alphabetical site index, and an annotated list of all articles. Formerly called FrEdMail (Free Educational Mail), GSN is
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 The Global Schoolhouse  Global SchoolNet Foundation (GSN)
The Global Schoolhouse focuses on projects for lifelong learning and uses the most powerful Internet tools, including live video, to link K12 classrooms to their communities and to other children around the world. Projects that discover and document
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 Global Student Network  Global Student Network, LLC
Provider of online homeschool curriculum, delivered entirely over the Internet. Over eighty courses for grades 212. Free online demo.
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 Globewide Network Academy (GNA)
A worldwide nonprofit consortium of educational and research organizations for support of online courses and distance education. Its mission is to improve education by creating a marketplace for courses as well as to offer administrative and technical
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 goENC.com  ENC Learning, Inc.
Resources and support for math and science educators needed to help raise student achievement in these vital subjects. Search over 27,000 print and multimedia curriculum resources and professional development materials. Webbased resources are only available
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 Go Figure  CleverMedia
Find the sequence of numbers that completes the equation. Requires the Flash plugin.
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 GoKidding  Sarveshwar Rao
Flash activities on counting, adding, subtracting, and naming shapes (polygons). Worksheets include circle mazes, fun with circles, and fun with triangles.
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 The Golden Mean  Rashomon (K. Wiedman)
The Golden Mean or Golden Section was derived by the ancient Greeks. Like pi, the number 1.618... is an irrational number. Both the ancient Greeks and the ancient Egyptians used the Golden Mean when designing their buildings and monuments. Links to pages
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 Golden Ratio, Fibonacci Sequence  Math Forum, Ask Dr. Math FAQ
About the Golden Ratio (or Golden Section or Golden Mean), the Golden Rectangle, and the Fibonacci Sequence.
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 Golden Rectangle and Golden Ratio  Jim Loy
An introduction to the ratio involved in the Golden Rectangle, with a link to The Most Pleasing Rectangle Web Poll.
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 Gold Medal Math  EdVenture Software
An educational software program which reinforces math skills through ten 3D animated Olympic events for students in grades 26. Site includes product description, screen shots, ordering and contact info. Typing program also available.
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 GoldStudent Helps Your Child Excel in Math  GoldStudent
An online math enrichment and assistance program for students K6. With customized study guides and over 4 million math worksheets, GoldStudent is designed to help children improve their problemsolving skills, gain confidence in their math abilities
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 GoldStudent  Ning Wang and Andrew Cleland, GoldStudent
Goldstudent.com is an online math training program for students in grades K6. An initial assessment test is used to develop a personalized study guide for each student. Students advance topic by topic based on the results of their work on worksheets
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 Google
A search engine that analyzes the way Web pages are linked to one another and automatically generates lists of Web resources based on frequency of linking.
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 Google Calculator
Google's calculator feature evaluates math expressions. The google.com and the Google Toolbar search boxes now handle queries such as: 56*78, half a cup in teaspoons, (G * mass of earth)/(radius of earth ^ 2), and 1.21 GW / 88 mph. Google provides instructions
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 Google Groups Discussion: TINspire  Rex Boggs, moderator
For users of the TINspire handheld, Rex Boggs has set up a moderated discussion group at Google Groups. The purpose of the discussion is to share knowledge and problems to make the technology more productive, enjoyable and enlightening. If you are interested
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 Googol, Googolplex  Math Forum, Ask Dr. Math Common Question
A selection of answers to questions about googols and googolplexes, such as who coined the terms, how big they are, whether it is possible to hold a googol in your hands, and more.
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 Googol Learning  Susan Jarema
"It wasn't until I began teaching my own children math and had to relearn it that I began to see its beauty...." From the family publishers of the Discovery Multiplication Program, music such as "Multiplication Vacation," and other educational DVDs, games,
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 Googolplex  Frank Pilhofer
The American mathematician Edward Kasner once asked his nineyearold nephew to invent a name for a very large number, ten to the power of one hundred; and the boy called it a googol. He thought this was a number to overflow people's minds, being bigger
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 Gordon's Games, Simple Math, Not So Simple Math, Not Just Math  Gordon Scott
Booklets intended to be a resource for those who teach Primary Math, K3, ages 48: beginning teachers, home schooling parents, teachers of teachers, and teachers wishing to supplement a text. Over 25 simple and inexpensive math games; basic math with
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