 The Enigma Machine  Russell Schwager
This Java applet simulates the operation of an Enigma machine, based on the one used by the Germans in World War II to encrypt military messages. With information on the history and workings of the mechanical Enigma machine; a brief description of how
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 Enigmatum, Centre des Énigmes
In French: A tous ceux qui aiment se creuser la tête, de nombreuses énigmes classées
par thèmes: logique, mathématiques, paradoxes etc.. Toutes les énigmes sont
accompagnées de leurs solutions. Des plus petits au plus grands venez
travailler votre
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 Enlaces en español para la matemática / Spanish language math resources  Math Forum
Mathematics and math education resources available online in Spanish, collected by the Math Forum. Categories: Juegos de ingenio/Problems and Puzzles (Brainteasers, games, and competitions); Lecciones y actividades/Lessons and activities (Lesson plans
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 The eNLVM Project: Promoting Student Achievement in Mathematics through Educator Collaboration [PDF]  Pam Buffington, Burt Granofsky, eNLVM Project
This article explores the use of the eNLVM from the perspectives of Curriculum Developer, Math Content Expert, Special Education Professional, and Classroom Teacher. The article paints a picture of how multiple educators can collaborate to use the eNLVM
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 Ensuring Equity and Excellence in Mathematics (NCREL)  Claudette Rasmussen; Pathways to School Improvement
Critical issues in mathematics. Educators and community members are beginning to recognize that most students, including a disproportionate number of women, minorities, and the poor, leave school without the mathematical skills they need to thrive in
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 Epistemology and Learning Group  Massachusetts Institute of Technology (MIT)
Constructionism asserts that knowledge is not simply transmitted from teacher to student, but is actively constructed by the mind of the learner, and that learners are particularly likely to create new ideas when they are actively engaged in making external
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 Epson Omega Designs  Khaled Omran
Downloadable software for solving, plotting, and manipulating functions and matrices. Demo free trial versions or purchase Mathwizard, the matrices calculator, and the algebra calculator.
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 Equality and Education  The Century Foundation
Links to information examining causes and effects of economic inequality and exploring policy options for redressing such problems as home inequity, summer schooling, integration, educational choice, and others. Topics: Classroom Inequality, School Choice,
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 Equals and Family Math  Franco, Kreinberg; Lawrence Hall of Science, Univ. of California at Berkeley
EQUALS programs provide workshops and curriculum materials in mathematics for teachers, parents, and community members, working to increase access and equity in mathematics for students in traditionally underrepresented groups. There are over forty EQUALS
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 Equate: The Equation Thinking Game  Conceptual Math Media, Inc.
Have fun creating equations crosswordstyle. An arithmetic version of Scrabble, Equate is a math board game for family and classroom. Earn higher scores by using division or fraction tiles, or by playing tiles on premium board positions that double or
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 Equation Search  Octahedron, LLC
Browse common equations in algebra, geometry, trigonometry, calculus, probability, and finance; or perform keyword searches by equation name, variable name, constant name, and category.
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 Equation Solver  Alexey V.Voronin
Midlet "Equation Solver" is a mobile phone app intended to solve systems of linear algebraic equations with real coefficients of the second and third order (with two and three unknowns). System Requirements:
Mobile phone should have a color screen and
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 Equipped for the Future: Fundamentals  Equipped for the Future, National Institute for Literacy
Begun in 1994, the National Institute for Literacy’s Equipped for the Future (EFF) initiative started the development of a framework for adult learning content standards. These content standards were constructed to strengthen the ability of adult education
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 Equity & Access: General  Key Issues in Mathematics at The Math Forum
Issues, networks, general Web resources on equity in mathematics. Also entries of specific interest to minorities, women, people with disabilities, and nonEnglish speaking visitors.
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 Equity and Access in Mathematics Education  EXTEND  Perspectives in Mathematics Education
A summary of an EXTEND roundtable held to discuss key issues and questions concerning equity and access in mathematics education in the context of rapidly changing state and local policy. Links to: key themes of outcomes count, principals count, and teachers
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 Equity Center: Selected Publications (NWREL)  Northwest Regional Educational Laboratory
Publications developed by the NWREL Equity Center (Improving Education for Immigrant Students; Preventing and Countering SchoolBased Harassment: A Resource Guide for K12 Educators; The Fourth R: Responsibility  Ensuring Educational Excellence Through
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 Equity Education On Line  The Equity Assistance Center
One of 10 Federal Desegregation Assistance Centers (See DEACs)  provides services in race, national origin, and sex equity, and welcomes the opportunity to provide technical assistance, onsite training, and planning assistance to school districts in
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 Equivalent Measurements  Math Forum, Ask Dr. Math Common Question
A table of equivalent measurements for units such as teaspoons, tablespoons, cups, pints, quarts, gallons, ounces, and pounds.
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 EquPlus  Maria Chernenko
An index of math and science equations, rendered in TeX, MathML, png image files, and MathType. Browse categories such as algebra, calculus, geometry, signal processing, trigonometry, and statistics. See also EquPlus's unit conversions, constants, and
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 Eratosthenes Finds Diameter of Earth!  Mary Kay Hemenway, University of Texas at Austin
Students learn to estimate the diameter and circumference of the Earth by repeating Eratosthenes' experiment, exchange measured data and results, and use the Internet to research the mathematical and scientific contributions of Eratosthenes. Hemenway
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 Eric Buffington
YouTube lessons and other educational math videos by a Pennsylvania cyberschool teacher. See, in particular, Buffington's channels on "Math That Makes you Think," "Math in Real life," and episode 1 and episode 2 of "What Kids Say About Math."
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 Eric Digest 104: Block Scheduling  Karen Irmsher
A 1996 article, with a bibliography: What's wrong with the traditional day? What is Block Scheduling? What are its advantages and challenges? What advice do experts have for making the change?
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 ERIC Digests  Educational Resources Information Center (ERIC)
Digests are short reports on topics of prime current interest in education, targeted specifically for teachers, administrators, policymakers, and other practitioners, but generally useful to the broad educational community. Each offers an overview of
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 Erich's Packing Center  Erich Friedman
A huge collection of packing problems, each explained with graphics. 2D examples include Triangles in Squares, Circles in Squares, Squares in Squares, Triangles in Triangles, Circles in Triangles, Squares in Triangles, Triangles in Circles, Circles in
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 Erich's Puzzle Palace  Erich Friedman
Mathematical puzzles, with solutions, in the following categories: mirror puzzles, number puzzles, hex loop puzzles, path puzzles, battleship puzzles, triangulation puzzles, grid puzzles, criscross puzzles, weight puzzles, and logic puzzles. In particular,
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 Eric Weisstein's World of Scientific Biography  Eric Weisstein. Wolfram Research
The World of Biography briefly outlines the discoveries and advances of over 250 mathematicians, and includes links to publications with more historical details about the individuals. Each notecardlike bio puts a face to the entries in MathWorld, Weisstein's
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 Escape Velocity Calculator  Brian Martin
This minimal javascript tool calculates the escape velocity of a body given the body's mass and radius (sample data are provided for the Earth, the Moon, Jupiter, and the Sun).
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 Escher Web Sketch  Wes Hardaker, Gervais Chapuis; Univ. of Lausanne, Switzerland
A Java applet that allows you to draw repeating patterns. With documentation on how to use the applet, a pattern archive, the authors' favorite patterns, a link to download Escher Web Sketch, the program's source code, and interesting crystallographic
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 ESCOT (Educational Software Components of Tomorrow) Problems of the Week  Math Forum
An interactive problem of the week service offered from 1999 until 2001. ESCOT is an NSFfunded research grant that developed interactive Java applets to help middle school learners understand typically difficult math concepts, for example, fractions
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 Esri
Developers of geographic information systems (GIS). Math education books include GIS Tutorial, Fun with Global Positioning Systems (GPS), and the series Our World, which features software, lessons, data, and assessments. ESRI's ArcLessons library freely
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 Essays on Constructivism and Education  Tom O'Haver; Maryland Collaborative for Teacher Preparation
An extensive collection of articles on constructivist teaching strategies, change in education, technology in the classroom, hypertext and cognitive flexibility, constructivist pedagogy readings, and more.
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 The Essence Of Algebra  Jim Loy
Simple explanations of variables and equations for the beginning student of algebra.
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 Esso Family Math Project  Barry Onslow, Judi Waters, Nancy Chapple, Linda Adams, et al.
A communitybased program for families that uses everyday materials and math games to help children understand math ideas. Concepts used in the real world  such as measurement, estimation, and mental math  are sometimes difficult for
children to
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 Estimation 180  Andrew Stadel
A new estimation challenge every day of the school year, with accompanying video answers. Join the number sense challenge online by submitting your own estimates, explaining your reasoning ("What context clues did you use?") and rating your accuracy ("How
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 Estimation Contest (SMILE)  Sandra A. KingBryson, Saucedo Magnet School
A lesson that uses breakfast cereal to give students a concrete understanding of the subtle difference between a guess and an estimate. From the Practical and Applied Math section of a collection of almost 200 single concept lessons by the Science and
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 e Teaching Assistance Program  eTAP, Inc.
Lesson plans, examples and exercises, review checks, and other instructional materials, including audio downloads, on the language of mathematics; basic operations; order of operations and combining terms; fractions; multiplying and dividing fractions;
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 Ethnography at the Math Forum [PDF file]  Wesley Shumar
A discussion of the author's research on teacher communities, networking, and professional development online through the Math Forum, and techniques used to study them.
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 Ethnomathematics Digital Library  Pacific Resources for Education and Learning
A resource network and interactive learning community for ethnomathematics, with emphasis on the indigenous mathematics of the Pacific region. Search this resource network's links to relevant websites worldwide; or browse it according to geographic area,
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 Ethnomathematics  Nancy Casey
Ethnomathematics is the study of mathematics which takes into consideration the culture in which mathematics arises. Mathematics is often associated with the study of "universals"; however, it is important to recognize that often something we think of
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 e to the i pi  Kevin Bertman
Investigations for teachers to use in mathematics classes. Posts include Phantom Traffic Jams (velocities); Hypotrochoids (Spirographs); Cartograms; Rogue Waves; Fractal Trees; Stereoscopic Images; Six Degrees of Separation; Shoelaces (applying the Pythagorean
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 The Euclidean Algorithm  David Sumner
Find the greatest common divisor (GCD) online using the Euclidean Algorithm. Enter two numbers, and the JavaScript calculates GCD, least common multiple (LCM), and linear combination; and displays the steps of the algorithm.
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 Euclide  Patrick Iglesias; Ecole Normale Supérieure de Lyon
Euclide est un logiciel d'apprentissage de géométrie plane pour
Macintosh destiné au collégiens et lycéens, pour aider à comprendre quelques théorèmes de géométrie plane, à
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 The Euclid Project  Dr. Robert E. Mason IV, The Dalton School
Description of a math program that uses visualization, analysis, informal deduction, and formal deduction to engage students in the study of geometry in an integrated manner. For example, a 7th Grade Geometer's Assignment on circles uses the Geometer's
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 EucliDraw  Kostas Pamfilos, George Nikoloudakis, and Paris Pamfilos
A program to draw plane Euclidean geometry figures. Features include an extensible toolbox, animations, Euclidean and arbitrary transformations, a catalogue of trianglecentertools, SchemeSockets to combine and generate complicated schemes and fractals,
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 Euclid's Algorithm  Interactive Mathematics Miscellany and Puzzles, Alexander Bogomolny
An explanation of Euclid's algorithm for finding the greatest common divisor (gcd) of any pair of numbers, and a relation to the fundamental theorem of arithmetic, with links to related pages on Euclid's Game, binary Euclid's Algorithm, more on the gcd
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 Euclid's Muse  Saltire Software
Hundreds of free interactive math apps created by users of Geometry Expressions, a constraintbased and symbolic geometry software package developed in part with grants from the National Science Foundation (NSF).
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 Eugenia Cheng
Research as well as "things for nonspecialists" by a mathematician "keen to bring mathematics to a wider audience and help reduce maths phobia." Articles by the author of HigherDimensional Categories: An Illustrated Guide Book and Cakes, Custard and
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 The Euler Archive
The Euler Archive is an online resource for Leonhard Euler's original works and modern Euler scholarship. The searchable database provides access to his original publications, references to available translations, and current research. Also available
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 The Euler Characteristic of an Orbifold (Geometry and the Imagination)  Conway, Doyle, Gilman, Thurston; The Geometry Center
Suppose we have a symmetric pattern in the plane. We can make a symmetric map by subdividing the quotient orbifold into polygons, and then 'unrolling it' or 'unfolding it' to get a map in the plane...
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 The Euler Line of a Triangle  David Joyce; Dept. of Mathematics & Computer Science, Clark University
A draggable geometry applet illustrating the centroid, circumcircle and circumcenter, and altitudes and orthocenter of a triangle, and the straight line they all lie on, the Euler line.
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