 The Ideal Voting System (Math Chat)  Frank Morgan, MAA Online
Answering the challenge: What is the shortest line segment fencing off prescribed area 0 < A < 1 in a unit square? (What about the leastarea piece of plane dividing off prescribed volume 0 < V < 1 in a unit cube? What about a 4D cube?) ...assume
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 iFigure
Links to online calculators and worksheets that provide information to help in planning, solving and making decisions for problems and tasks such as buying a home, investing money, figuring business profits, making statistical comparisons, or calculating
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 I Hope This Old Train Breaks Down...  Mimi Yang
Blog by a high school algebra, precalculus, and calculus teacher in Seattle, by way of teaching positions in New York City, El Salvador, and Germany. Posts, which date back to March, 2009, have included "Math Projects," "The magic of teaching; El Trifinio,"
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 Illusions of Depth (Elementary Art Lessons, Arts Wire)  Michael Delahunt
A 3rd grade lesson plan on "Seeing Near and Far": students learn how overlapping and size differences show perspective, and that on a level surface, the lowest part of a near subject is lower in a picture than the lowest part of a farther subject, recognizing
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 ILoveMath.org  Shelli Temple
ILoveMath.org is a comprehensive site for middle and high school math teachers full of "readytouse" lesson plans, worksheets, activities, and more. The site also features an active message board for math teachers to collaborate.
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 IMATH  Cathleen V. Sanders
A professional development course for teachers designed to help them integrate technology and the NCTM Standards into their teaching. Although this course is only available for credit to Hawaii teachers, teachers from other states may participate in the
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 The impact of dynamic geometry software on learning  Bryan Dye; MathsNet
A paper that aims to measure the impact of use of dynamic geometry software on learning via the Internet; to compare various software packages, for example: Geometer's sketchpad, Cinderella, and CabriGeometre; and to measure the impact of "home learning"
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 Improving Measurement and Geometry in Elementary Schools (IMAGES)  Research for Better Schools (RBS)
Information and resources designed to help teachers develop a deeper understanding of geometry and measurement concepts and to assist in designing meaningful instruction for elementary students. Topics addressed include: cognitive and developmental issues;
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 IMSA Math Journal  Michele Micetich; Illinois Mathematics and Science Academy
A journal published annually since 1993; each issue contains articles, problems, and activities spanning a wide variety of topics of interest to high school mathematics teachers and students. Articles are available in both online and downloadable versions.
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 InfoMath
Online K12 math, following the premise that learning mathematics the traditional way is more effective than by playing games. Webbased courses: Math Tutor, PreAlgebra Tutor, Algebra Tutor, PreCalculus.
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 Inhaltsverzeichnis Mathematik  C. Eisenhut
German language primers on arithmetic and basic operations, solving equations and inequalities, functions, probability and statistics, geometry, and more.
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 in pursuit of nerdiness
Blog by a middle grades and high school math teacher, formerly in the South Bronx, currently in the Netherlands teaching both within the Dutch national curriculum (in English) and within the International Baccalaureate Middle Years & Diploma Programs.
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 Inquiry maths  Blair, Andrew; and Martin, Caitriona
Inquiry prompts for topics related to number, algebra, and shape to use in secondary school mathematics. Accompanying notes support teachers who "want to make their lessons more open and, thereby, encourage student independence and leadership."
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 Inspirational Mathematics for Interactive Whiteboards  PowerpointMaths.com
A large collection of Powerpoint resources for the mathematics classroom, for use with electronic whiteboards, in the categories: algebra, data handling, enrichment, measures, mental maths 5000, number, and shape and space.
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 The Institute for Figuring  Margaret and Christine Wertheim, CoDirectors
"If mathematics is a language of pattern, its structures may be seen as the verses of a formal, yet fantastical poetics. Across the globe people have delighted in the harmonies of this language and the patterns discovered therein. These are the songs
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 Intelligent Tutor Math Educational Software, Inc.
The programs in the Intelligent Tutor software series contain tutorials designed to help students learn and master Grades 712 math subjects. The programs are designed with school versions for use in schools, and home versions for individuals in selfstudy
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 Interactivate: Assessments  Shodor Education Foundation, Inc.
A set of Shodor's Interactivate activities that allow the user to keep track of correct responses. To use these activities as "assessments" just select the "Keep Score" button on the Java applet page. A number of these activities, the Connect Four type
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 Interactive and animated Geometric Algebra with Cinderella  Eckhard Hitzer
More than 90 JAVA applets that range from the elementary concepts of vector, bivector, outer product, and rotations, to triangle relationships, oscillations, and polarized waves. A special group of 21 applets illustrates three geometrically different
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 Interactive Geometry with JavaSketchPad  Bryan Dye; MathsNet
Java applets illustrate geometrical figures (circle, cuboid, equilateral, isosceles, and scalene triangles, kite, parallelogram, regular hexagon, octagon, pentagon, quadrilateral, square, rectangle, rhombus, trapezium); show what is meant by congruence,
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 Interactive Java Applets  Fergus Murray
Dragoric (The animated fractal toy); Toroidia (Adventures in toroidal geometry); Trochor (Fun with trochoids). See also Fergus Murray's Mathematical Graphics Page, and his mathematical animations.
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 Interactive Math  Christopher Henrich
Topics in recreational mathematics, including polyhedra, kaleidoscopes, magic squares, and trochoids, presented with interactive applets.
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 The Interactive Mathematics Classroom  Rex Boggs
A digital library of thirdparty technology resources for teaching mathematics, from kindergarten to calculus. Register to comment on interactive whiteboard files, Powerpoints, TINspire documents, Excel spreadsheets, and other digital resources. RSS
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 Interactive Mathematics Miscellany and Puzzles  Alexander Bogomolny
"The peculiar beauty of Mathematics lies in deduction, in the dependency of one fact upon another. The less expected a dependency is, the simpler the facts on which the deduction is based  the more beautiful is the result." This awardwinning site offers
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 Interactive Mathematics Online  ThinkQuest 1996
Algebra (Postulates  Things you can do with equations and inequalities, Function Basics and Simple Graphing, Kinds of functions (periodic, odd, even, etc.), Function Squashing); Geometry (an introduction, applications, glossary, sample problems); Trigonometry,
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 The Interactive Mathematics Program (IMP)  Chicago, Univ. of Illinois
A Model for Mathematics Education Reform. A fouryear, problem based mathematics curriculum for high schools, to meet the needs of both collegebound and noncollegebound students. IMP is designed to replace the fourcourse sequence typical of most high
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 Interactive Mathematics Program (IMP)  Key Curriculum Press
A fouryear integrated problembased secondary mathematics curriculum and professional development program for teachers that meets college entrance requirements and prepares students to use problemsolving skills in further education and on the job. Information
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 InteractiveMathTutor.com  Howard Heller
Fee services include oneonone tutoring, email helper, phone helper, and homework helper. Register for free worksheets and solutions. Math subjects include elementary math, algebra, geometry, trigonometry, integrated math, calculus, statistics, and
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 Interactive NonEuclidean Geometry  Carlos CriadoCambon and JuanCarlos CriadoAlamo
Draw in Euclidean and spherical geometries  as well as the four most popular models of hyperbolic geometry: Klein, Poincaré, halfplane, and hemisphere. This freeware lets you define points, lines, segments, and circles; analyze distances, angles,
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 Interior Design (SMILE)  Sally Hill, Horatio May Community Academy
A lesson for grades 46 designed to teach students to calculate area and perimeter in inches. From the Geometry and Measurement section of a collection of almost 200 single concept lessons by the Science and Mathematics Initiative for Learning Enhancement.
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 InterMath Dictionary  The University of Georgia
A searchable dictionary for middle schoollevel mathematics students, teachers, and parents. The dictionary provides related terms, everyday examples, interactive checkpoints, and challenges. Funded by the National Science Foundation, InterMath is a collaborative
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 InterMath  The University of Georgia
InterMath is a professional development effort designed to support teachers in becoming better mathematics educators. InterMath workshops provide an ongoing support community, a lesson plan database, and a discussion board. The site provides mathematical
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 International Mathematical Olympiad (IMO) / Olympiade internationale de mathématiques (OIM)
The World Championship Mathematics Competition for High School, which takes place each year in a different country. Its membership (by invitation only) has gradually expanded to over seventy countries from all five continents. Latest competition results;
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 Internet Math Challenge  Dept. of Mathematics, University of Idaho
A weekly K12 math challenge from the math department at the University of Idaho, discontinued in 2004. Past puzzles and solutions are available.
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 The Internet Mathematics Challenge  Julie Houston and David Trask
Explore the geometry of architecture, and share your observations with the students who built this site. With a Javaenabled browser, mouse over pictures of buildings to find the angles, arches, and other geometric figures appearing in Durham Cathedral,
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 Introduction à la géométrie absolue avec CabriJava  Yves Martin
Pages on the Bachmann' axiomatic with dynamic (CabriJava) examples in the
hyperbolic or elliptic plane.
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 An Introduction to Angles (SMILE)  Samuel A. Anoma, Hyde Park Career Academy
A lesson designed to teach students to name, classify, identify, and measure angles. From the Geometry and Measurement section of a collection of almost 200 single concept lessons by the Science and Mathematics Initiative for Learning Enhancement.
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 An Introduction to Area and Perimeter (SMILE)  Edwina R. Justice, Gunsaulus Scholastic Academy
A lesson for grades 47 designed to use a phenomenological approach to teach students to measure, record, discover, and apply rules for area and perimeter. From the Geometry and Measurement section of a collection of almost 200 single concept lessons
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 Introduction to Geometry  ThinkQuest 1996
Four basic lessons in geometry, each divided into separate sections, with a final test and a reference page with formulas. 1  Basics (Terminology, Relationships, Calculations); 2  Introduction to Proofs (Theorems, Reasoning, Proofs with Segments, Proofs
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 Inventing Science: From Thales to Euclid  Gregory Crane, Tufts University
Classics 189: Greek Science. Euclid's synthesis remains the most successful single book on math every written, but advances were made in many other fields such as geography, astronomy and the natural sciences. Aristotle, in particular, laid the foundations
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 Inversion Geometry  Paul Kunkel
The elementary concepts are explained, with a quick reference for other lessons that employ inversion geometry.
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 iP  Interlocking Puzzles
Purchase hand crafted hardwood interlocking puzzles made with precision from domestic or exotic hardwoods. Altekruse, Burr, Pentominoe, Polyhedra, Rhombic, Stewart Coffin, Tetrahedron, and Wooden Knot puzzles. Order via email.
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 Isard  JeanSébastian Roy
A free dynamic geometry program for Windows, PowerMac, and Linux. Like Cabri, but in Smalltalk (and smaller). The source is available and may be extended as needed.
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 ISAWI Laboratory  Hasan Isawi
Geometria_descrittiva; La Cupola della Roccia  graphic representation of architectural plans; static and/or dynamic montage of any real or virtual image. Graphic representations for thesis and university examinations. Gallery of images.
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 Isn't It a Great Time to Be Alive?  Rex Boggs
PDFs and Promethean ActivInspire flipchart files which survey the range of digital technology available to assist in the learning and teaching of mathematics. These free downloads accompanied the talk given by the veteran middle school math teacher to
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 IsoDraw  Mervin Bitikofer
IsoDraw is downloadable freeware for Windows machines that allows students to play on a drawing space with polygons and various isometries. They can place and move multiple reflection lines on the screen, and watch the effects of translations and rotations.
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 Isotiles  John Everett
Isotiles are specially designed tiles, in just two triangular shapes, by
which a wide range of topics in geometry can be studied. Topics include: different types of angles; lines and angles; angles of a triangle; isosceles triangles; similar triangles;
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 IUP Annual Mathematics Competition  Gary Stoudt
A mathematics competition for high school students sponsored by Indiana University of Pennsylvania. Topics include algebra, geometry, and trigonometry. Registration forms may be found online, and previous competitions may be downloaded in PDF, PostScript,
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 IXL Learning
IXL provides free online practice, organized by grade levels K8 and aligned to state standards. Choose one math skill from among the hundreds offered, and submit your answer. Respond incorrectly, and click on the "explanation" button to learn more; get
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 James Poon Online Classroom  James Poon
Online instructional mathematics videos; a discussion forum; and articles on study skills.
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 JavaGSP!  Annie Fetter, the Math Forum
A short tutorial: everything you need to know to make your first JavaSketchpad page. A quick reference, then some other features, details, and considerations you might want to familiarize yourself with if you choose to incorporate Java GSP into some of
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