 Gasoline Sales  Reading a Chart  NASA Lewis Learning Technologies Project
This chart shows the actual and predicted gasoline sales for one year. During which month was there the greatest difference between the predicted and actual gasoline sales? A detailed answer is provided. From NASA's 9th Grade Math Proficiency Test.
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 Gas, Water, Electricity (Geometry and the Imagination)  Conway, Doyle, Gilman, Thurston; The Geometry Center
A diagram shows three houses, each connected to three utilities. Show that it is impossible to rearrange the connections so that they don't intersect each other. Could you do it if the earth were a not a sphere but some other surface?
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 Gecko Stone  John August
Tessellated, interlocking concrete pavers and molds. Like Escher's reptile, the tessellating shapes are modified hexagons.
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 GEM: Gateway to Educational Materials  National Library of Education (NLE)
A database for education links, intended to be more useful for teachers than a search engine. It records the resources of its consortium members (information on joining the consortium is available onsite). Users are able to: browse through lists organized
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 Gender, Diversities, and Technology Institute  Education Development Center, Inc. (EDC)
The Gender, Diversities & Technology Institute focuses on developing genderhealthy education and schools; technology and gender; the elimination of all forms of gendered violence; improving economic selfsufficiency for both women and men; and developing
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 Gender Equity in Education  Martha C. PhelpsBorrowman
Listing of gender equity sites; directory of science lesson plans.
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 Gender Issues: Articles and Research  Carolyn K., Hoagies' Gifted Education Page
Articles and reports on gender and equity in schools, in particular in the context of the education of gifted children.
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 General Tables of Units of Measurement  Office of Information Services, National Institute of Standards and Technology (NIST)
Tables of metric units of measurement; tables of U.S. units of measurement; notes on British units of measurement; tables of units of length (international and survey), area (international and survey), capacity (dry and liquid volume measure), mass not
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 Gene's Corner: A Play on Numbers  Eugene Maier, Math Learning Center (MLC)
A series of mathematical vignettes that use visual models to illuminate elementary math topics. The scenes include: The Counting Numbers; Adding Counting Numbers; Subtracting Counting Numbers; Multiplying Counting Numbers; Dividing Counting Numbers; The
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 GeniusCorner  Dheeraj Khatter
Adaptive online learning platform for practicing math at your own pace. Freely access multiple choice and fillintheblank math quizzes, organized by grades from preK through eighth; GeniusCorner keeps time, scores responses, and offers explanations.
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 GenkiMaths.com  Richard Graham
Popular classroom games used in Japan for teaching language skills, but "remixed" to be of use to math teachers.
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 Geoboards in the Classroom  Tom Scavo
A Web unit for teachers from Tom Scavo that offers suggestions for using geoboards to explore the length and area of twodimensional geometric figures. The Introduction includes pages that describe materials needed, offer discussion and activities for
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 GeoCalc  BaldGeeks
Macintosh shareware for calculating the area, perimeter, sides, angles, and other measures of two and threedimensional shapes such as ellipses, rectangles, triangles, trapeziums, parallelograms, polygons, prisms, cylinders, cones, pyramids, and spheres.
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 GEO Gateway  NASA, John C. Stennis Space Center
A portal to information about Geographical Information Systems, Global Positioning Systems, and remote sensing. Sections for teachers, students, and professionals, as well as a barebones facts section for everyone. A National Workforce Development Education
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 Geometer's Sketchpad: Introductory Lab  Mike Riedy
A beginning tutorial, with worksheets, for using GSP. Lab is organized into five parts: Preliminary Setup (formatting a disk, starting and quitting the Geometer's Sketchpad, making mistakes); Toolbox (introduction to the GSP tools: circle, select, point,
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 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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 George Washington School Copy Book  Library of Congress
Scans of a school copy book handwritten by the future first U.S. President in 1745, when 14 or 15 years old. Together with a second book, these reveal geometrical definitions and problems, surveying, mensuration, multiplication and division, simple interest,
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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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 GIFsmos  Lusto, Chris; Luberoff, Eli; and Merrill, Jason
Takes any animated Desmos plot and converts it into a dynamic graphic. GIFsmos lets you determine the size of the resulting gif animation, and toggle its frame interval from 0.1 to 1.0 seconds.
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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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 GlassLab Games  GlassLab, Inc.
This game studio develops learning games that "make learning visible" and studies their impact on improving student outcomes. Titles include SimCityEDU; Wuzzit Trouble, developed by BrainQuake Inc.; Slice Fractions, developed by Ululab; and Game Over
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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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