 Geometry Distance of Triangles using a Protractor (SMILE)  Eileen Lally, A. Philip Randolph Magnet School
Students in the 7th grade learn how to use the protractor to measure angles, and use this ability to solve a problem involving distance. From the Geometry and Measurement section of a collection of almost 200 single concept lessons by the Science and
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 Geometry in Motion  Daniel Scher
Direct interaction with geometric diagrams, courtesy of JavaSketchpad. The contents include a variety of curvedrawing devices (Intersecting Circles, Falling Ladder, Van Schooten's Parabola, and more); also other activities such as Constant Perimeter
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 Geometry  Interactive Mathematics Miscellany and Puzzles, Alexander Bogomolny
More than 95 games or puzzles having to do with geometry, chaos, fractals, and topology with extensive discussions and solutions. Most require a browser capable of displaying JavaScript or Java.
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 The Geometry Junkyard  David Eppstein, Theory Group, ICS, Univ. of California at Irvine
A collection of usenet clippings, web pointers, lecture notes, research excerpts, papers, abstracts, programs, problems, and other stuff related to discrete and computational geometry  some serious and much also entertaining. Junk sorted into piles (Topics):
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 Geometry of the Sphere  John C. Polking, Rice University
This set of Web pages formed the text for part of the Advanced Mathematics course in the High School Teachers Program at the 1996 IAS/Park City Mathematics Institute. Material covered includes basic information about spheres, proof and consequences of
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 geometrypuzzles  Math Forum
A discussion group accessible as a Webbased discussion, a mailing list, or a Usenet newsgroup, for interesting problems and conundrums that require only a knowledge of elementary geometry, and discussions of solutions. Read and search archived messages;
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 Geometry Web Page  Ephraim Fithian; Kutztown University
Sixteen geometry activities: Tangrams; Golden Ratio; Geoboard; Polygons; Symmetry; Constructions; Polyominoes and Polyiamonds; Star Polygons; Special Points in Polygons; Polygon Tessellations; Kaleidoscope Tessellations; Escher Tessellations; Space Cubes;
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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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 Glossary  Interactive Mathematics Miscellany and Puzzles, Alexander Bogomolny
A glossary of terms that also serves as an alphabetical index to Bogomolny's site. Each term is linked to an illustrated essay.
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 GoGeometry from the Land of the Incas  Antonio Gutierrez
Mixing dynamic geometry, animations, science, and Incan history, this Peruvian site offers geometry problems involving circles and triangles, with proofs: Poncelet, Napoleon, Eyeball, Steiner, Carnot, Sangaku, and the Butterfly Theorem. Also, Incan Geometry
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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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 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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 GOMATH  Cubic Science, Inc.
An Internet site to help high school students (grades 1012) of all levels with math skills. Programs such as Algebra 1 offer an interactive guide through a course and help students build up math skills and confidence. Math Programs are 46 week curricula,
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 GoodQuestions Project  Dept. of Mathematics, Cornell University
The GoodQuestions project seeks to improve college calculus instruction by adapting two methods developed in physics instruction — ConcepTests and JustinTimeTeaching. GoodQuestions is a pedagogical strategy that aims to raise the visibility of the
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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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 Googol Power  Susan Jarema, Googol Learning
What started as a fun way to help children learn math grew into two soundtracks and a 90minute video with puppet stars. Sound samples, video clips, and free worksheets are available on the site, as well as further information about the project. Worksheets
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 Gordon Royle's Homepage: Research  Gordon Royle
Catalogues and tables of interesting combinatorial objects: small graphs, cubic graphs, symmetric cubic graphs, vertextransitive graphs, Cayley graphs (by group), vertextransitive cubic graphs, cubic cages and higher valency cages, planar graphs, cubic
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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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 Got Math?  Dave Radcliffe
Blog by a community college math instructor and selfdescribed "GeoGebra fanatic." Posts, which date back to December, 2010, have included "Stacking cannonballs," "Counting with Integrals," "A Paradoxical Dissection," "Gelfand's Question," "Imagining
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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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 Grade Eight Problems  The Canadian School Math Page
A variety of word problems at the Canadian 8th grade level, with hints and answers.
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 Grade Eleven Problems  The Canadian School Math Page
A variety of word problems at the Canadian 11th grade level, with hints and answers.
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 Grade Five Problems  The Canadian School Math Page
A variety of word problems at the Canadian 5th grade level, with hints and answers.
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 Grade Nine Problems  The Canadian School Math Page
A variety of word problems at the Canadian 9th grade level, with hints and answers.
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 Grade Seven Problems  The Canadian School Math Page
A variety of word problems at the Canadian 7th grade level, with hints and answers.
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 Grade Six Problems  The Canadian School Math Page
A variety of word problems at the Canadian 6th grade level, with hints and answers.
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 Grade Ten Problems  The Canadian School Math Page
A variety of word problems at the Canadian 10th grade level, with hints and answers.
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 Grade Twelve Problems  The Canadian School Math Page
A variety of word problems at the Canadian 12th grade level, with hints and answers.
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 Grant Keady
Grant Keady, an adjunct professor at Curtin University, researches fluid dynamics and related subjects, with forays into computer algebra. Some of his papers are available online in PostScript, gzipped PostScript, PDF, .dvi, or Mathematica notebook format.
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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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 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 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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 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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 Gricha's Bank of Mathematical Questions
Offers mathematical multiplechoice questions for high school students, from the Junior Math Olympiad.. The site is largely in Dutch, but most questions (> 90%) are translated into English.
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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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 Grid Puzzle  Rick Reed
A magic square Java applet that presents a 4x4 grid with mixedup numbers in it: drag individual numbers or flip, move, or swap rows and columns to make diagonals, rows, and columns add to 34.
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 Grid Puzzles  Erich's Puzzle Palace; Erich Friedman
Four puzzles involving paths through a square grid, with constraints. Answers provided.
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 Group Pub Forum  G. C. Smith
The community pages for discussing any aspect of Group Theory, the mathematics of symmetry. Group Theory is a branch of algebra, but has strong connections with almost all parts of mathematics. Announcements, books and journals, conference information,
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 Guy Kindler  The Official Site  Guy Kindler
A mathematics Ph.D. student at Tel Aviv University. Math puzzles are ranked from easy to tough. A paper on approximation and various resources for a seminar on computational models may be downloaded in PostScript format. Related PowerPoint presentations
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 HAKMEM  Beeler, Gosper, Schroeppel; Artificial Intelligence Laboratory, MIT
A list of math and computerrelated problems, unsolved in 1972 when the list originated, compiled "with the hope that a record of the random things people do around here can save some duplication of effort  except for fun." Topics include: Geometry,
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 Hales Proves Hexagonal Honeycomb Conjecture (Math Chat)  Frank Morgan, MAA Online
Professor Thomas Hales of the University of Michigan has announced a proof of 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
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 Halloween Math Word Problems  Patricia Taverna
Addition word problems with a Halloween theme, as illustrated and written by Mrs. Taverna's second grade students. Mrs. Rollman's second graders posted their own problems at http://www2.lhric.org/pocantico/rollman/04/math.htm. Click and hold down over
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 The Handley Math Page  John Handley High School Mathematics Department
David Pleacher posted Problems of the Week in his classroom every week since 1968, and posted them online  with solutions and names of students who correctly solved them  from 1998 until his retirement in 2006. See also his lesson plans and worksheets,
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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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 Hankies, Snarks, and Triangles  Ivars Peterson (MathLand)
Both Alice's Adventures in Wonderland and Through the LookingGlass and What Alice Found There contain many examples of Dodgson's passion for mathematical games, puzzles, logic paradoxes, riddles, and all sorts of word play. Indeed, his fascination with
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 The Harmonic Series  Don Cohen (The Mathman)
Students are to write a program on a calculator or computer to find the sum. A sample problem from Chapter 5 of Don Cohen's worksheet book.
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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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 HarvardMIT Math Tournament  Early, Owen
The HarvardMIT Math Tournament is an annual math tournament for high school students. Categories of tests typically include algebra, calculus, combinatorics (formerly "advanced topics"), geometry, general, oral, team, and guts; minievents include Buzz
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