 The Golden Ratio  Blacker, Polanski, Schwach; The Geometry Center
Introduction to the Golden Ratio and Fibonacci Sequence. Instead of simply supplying definitions and asking the student to engage in mindless practice, students work through several activities to discover the applications of the Golden Ratio and Fibonacci
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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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 The Golden Ratio  John Kyrk
Animations for building the golden rectangle from the Fibonacci series; clockwise and counterclockwise spirals; how the proportions of the human body display the golden ratio.
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 The Golden ratio  MacTutor Math History Archives
Linked essay on the history of the golden ratio (golden number, golden section), from Euclid through Martin Ohm's book, Die reine ElementarMatematik. With references and other related web sites.
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 The Golden Rectangle (SMILE)  Edwina R. Justice, Gunsaulus Academy
A lesson for grades 68 designed to teach students to measure using metric units;
to calculate averages; to compare and round decimals; to use calculators; to examine the relation between the Fibonacci Sequence and the Golden Ratio; and to relate mathematics
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 The Golden Section In Art, Architecture and Music  Ron Knott
An introduction with illustrations and references to some applications and occurrences of the Fibonacci series and the Golden Ratio in architecture, art and music. The constant Phi has been used to design architecture, from the Parthenon in Athens to
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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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 Good Calculators
Online calculators for determining gradients, slopes, percentages, forces, factoring, fractions, powers, square roots, velocities, statistics, standard deviations, spring helical compressions, torques, areas, volumes, ratios, conversions, and more.
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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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 Google Public Data Explorer  Google Labs
The Google Public Data Explorer is available for beta testing and comment. It is designed to make large datasets easy to explore, visualize and communicate. As the charts and maps animate over time, the changes in the world become easier to understand.
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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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 GO Solve Word Problems: Using graphic organizers to understand and solve word problems  Tom Snyder Productions
This software program teaches students to recognize mathematical situations in word problems, comprehend problems with the aid of graphic organizers, and plan solutions with addition, subtraction, multiplication, and division. The program has instruction
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 Goudreau Museum of Mathematics in Art & Science  Stephanie Killian
When you visit the Math Museum in New York, you can build a math model; explore games and puzzles; view exhibits demonstrating how math is used in the arts and sciences; experience challenging but nonthreatening specialized programs and workshops in math;
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 Government Affairs and Education (AMS)  American Mathematical Society
Government Affairs: news from Washington on science funding; calls for action; policy statements; recent statements by the mathematical community; federal budget information; how to contact Congress; science policy events; and a link to the AMS Committee
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 Grades 912 Data Analysis and Probability (MSTE)  University of Illinois at UrbanaChampaign (UIUC)
A list of statistics resources from the Office of Mathematics, Science and Technology Education (MSTE), including lessons and useful data sets, organized to follow the NCTM Statistics Standards for grades 912. Links to the AP Statistics site and even
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 Grafica Obscura  Paul Haeberli
An evolving computer graphics notebook: a compilation of technical notes, pictures and essays. Contents include: Paper and Plotter: A 3D Surface; Laser Cutting for Rapid Manufacturing; Geometric Paper Folding: Dr. David Huffman; Paper and Light (An inexpensive
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 Grand Illusions  Hendrik Ball
A "site for the enquiring mind, with optical illusions, scientific toys, visual effects, and even a little magic." Includes a number of feature articles on vision, photography, mirrors, optical toys, movies, etc. See, in particular, the geometrical optical
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 Grandma Got STEM  Rachel Levy
Levy, a Professor in the Mathematics Department at Harvey Mudd College, blogs to collect public awareness and art projects that use grandmothers' pictures, names, and connections to science, technology, engineering, and mathematics (STEM) in order to
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 Grant Wrangler  Nimble Press
Searching this free grant listing service for the category math pulls up deadlines and capsule descriptions of dozens of funding opportunities for math teachers.
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 Grapher  Cary and Michael Huang
Enter a linear, quadratic, cubic, trigonometric, logarithmic, or other equation, then press an "evaluate" button to watch it render on the Cartesian plane, from left to right. Vary speeds and colors; zoom in and out.
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 Graphing Applet  Greg Vogl
This graphing Java applet illustrates variable substitution and function composition by encouraging the user to experiment with variables and look at a range of functions  logarithmic, trigonometric, exponential, and more. Parameters include xmin and
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 Graphing Calculator for Mac and Windows  Pacific Tech
Graphing Calculator calculates and displays two and threedimensional mathematical objects easily, and saves animations as QuickTime movies. The site includes a list of features, a guided tour, a picture gallery, a free demo, and ordering capabilities,
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 Graphing Calculator Help  PearsonHall Education
Help using the calculator models TI82, TI83, TI85, TI86, TI89, TI92, HP48G, CFX9850 GaPlus, Sharp EL9600C, and Casio FX2. Select a model to display PrenticeHall's help topics in alphabetical order, then click the topic to see specific instructions.
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 Graphing Game (SMILE)  Thomas Lalagos, Hyde Park Career Academy
A lesson that introduces the graphing of ordered pairs on the cartesian plane. From the Recreational and Creative Math section of a collection of almost 200 single concept lessons by the Science and Mathematics Initiative for Learning Enhancement.
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 Graphing Linear Equations on a Palm  Suzanne Alejandre
A middle school lesson using ImagiGraph and a Palm OS handheld to help students learn about linear equations. Includes information on where to try and/or buy the software.
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 Graphing Ozone Chemistry  The Exploratorium
A simple "howto" graphing example followed by other more sophisticated examples of graphing using NASA images and images from the Neumayer Antarctic Station. Also includes additional discussion questions concerning the social and economic aspects of
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 Graphing Stories  Dan Meyer and the BuzzMath Team
Videos, each 102 seconds in length, of stories for students to graph using the freely downloadable accompanying student template. Select from among constant, decreasing, increasing, linear, parabolic, periodic, piecewise, and step graphs; story subjects
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 Graphing with Excel  LabWrite Project Team
Tutorial modules for visualizing data in Excel: data input into cells, creating a scatter plot and line graph, bar graphs and histograms, importing text files, final formatting, regression lines, superimposing graphs, descriptive statistics, and selecting
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 Graphite  Common Sense Media Inc.
This free service from nonprofit Common Sense Education helps preK12 educators "discover, use, and share the best apps, games, websites, and digital curricula for their students by providing unbiased, rigorous ratings and practical insights." Built by
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 GraphPouch  Edcodia LLC
This iPad app lets you create graphing worksheets, use familiar PEMDAS operators to construct graphs, graph multiple equations per graph, reorganize them with draganddrop, "smart snap" to align objects, and more. Also available directly from the iTunes
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 GraphVisualizer  Terje Tysse
An applet that graphs simple functions, listed on the help page, over various user specified ranges.
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 GraspMath  Summit Interactive
Interactive CD and Video Courses to purchase: Elementary Math, Algebra, Geometry, High School Exit Exam Prep, Trigonometry, Calculus, TI Calculators and more. Stand alone math courses with assessments and guides; remedial math program supplements; tutorials
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 Grazing Animals  Math Forum, a Classic Problem from the Ask Dr. Math FAQ
A cow/goat/donkey is tethered to a barn in or a fence around a field... how long should the rope be so that she can eat half the grass?
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 Great Circle Mapper  Karl L. Swartz
Enter two locations on Earth (latitude and longitude, or airport codes) and see a map depicting the great circle path between them and a computation of the distance along that path. The Great Circle Mapper also displays the area within a given range of
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 The Greater Philadelphia Secondary Mathematics Project  The Greater Philadelphia Secondary Mathematics Project
A support site for the systemic implementation of professional development using nationally validated, exemplary, standardsbased secondary mathematics curricula in the Greater Philadelphia region. News and resources include edited dialogues about the
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 Greater Than, Less Than Symbols  Math Forum, Ask Dr. Math Common Question
A selection of answers to questions about "greater than" (>) and "less than" (<) symbols, such as memory aids for telling the difference between the two.
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 The Greatest Mathematicians of All Time  James Dow Allen
Rankings and capsule mathematical biographies of the 100 greatest mathematicians of all time, with discussion that covers great mathematicians' own selfappraisals; prizes and medals; omissions; proposed candidates; comparisons with other "top 100" lists
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 Great Math Programs  Xah Lee
A listing about 40 excellent recreational math programs for Macintosh that do: polyhedra and Rubic cubes, curves and surfaces, fractals and Lsystems, tilings and symmetry, game of hex and game of life, chess and fiveinarow, peg solitare and polyominos,
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 Great Maths Teaching Ideas  Will Emeny
Emeny's blog of teaching ideas and resources, which dates back to June, 2010, has included posts such as "Investigating the sum of interior angles in polygons," "Can you make practising the times tables fun? Yes, just give me three dice," "When angles
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 The Great Paper Airplane Challenge (TEAMS)  Jeannie Toshima; TEAMS Distance Learning, Los Angeles County Office of Education
Use origami to build the farthest flying airplane, and win the challenge. TEAMS looked for the farthest flying airplanes throughout the nation  the best
from each class. Students sent in the written directions (diagrams were acceptable) for folding
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 Greek Astronomy  MacTutor Math History Archives
Linked essay tracing the history of Greek astronomy from its beginnings with
Thales, in philosophy and timekeeping, through Pythagoras, Eratosthenes,
Hipparchus, Ptolemy, Plato, Aristotle, Aristarchus, and many others; with
references to relevant
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 Greek Mathematics and its Modern Heirs  SunSITE's Vatican Exhibit; Library of Congress
Classical roots of the scientific revolution. An essay on the history of Greek Math, with sample math problems. Covers Euclid's Elements and Optics, Archimedes' Works, Piero della Francesca's De quinque corporibus regularibus, and links to Ptolemy's Geography
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 Greek number systems  MacTutor Math History Archives
Linked essay on the history of the Greek number systems, notably the acrophonic system used in the first millennium BC, and the alphabetical numerals. With references and other related web sites.
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 Green Globs & Graphing Equations  Sharon Dugdale and David Kibbey
The original algebra and graphing software by Sharon Dugdale and David Kibbey, newly revised and updated by the authors to run on all versions of Mac OS X. Single user, multiuser, school, district, and other licenses available for a bundle that includes
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 The Greenwood Institute  Greenwood School
A dyslexia, learning disabilities, and literacy resource site, with links to Web resources and publications. Comprehensive training of literacy instructors for mainstream and specialized schools; support for home schooling; research support; and consulting
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 The Grey Labyrinth  Kevin Lin
A collection of mindbenders in math and logic. When a solution to one puzzle is posted, another solutionless puzzle is added. With an archive of past puzzles, links to other puzzlerelated sites, and a bibliography of works that inspired this site.
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 The Grid Game  Doug Ensley, Shippensburg University
A twoplayer game where the players alternate marking squares in a grid until there are none left. The first player chooses any single row or column and marks as many squares (at least one) as desired. The second player (the computer in this case) responds
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