 DragonBox  WeWantToKnow AS
"Secretly teaching algebra to your children" by letting them discover algebraic rules, play with them, then use the rules to solve puzzles through trial and error. See testimonials and videos about this multiplatform math game created by WeWantToKnow
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 Draining the Swimming Pool (SMILE)  William Byrne, Martin Luther King School
A lesson for grades 910 designed to teach students to determine the time needed to drain a quantity of water using tubes of different inside diameters; and to determine the time needed to drain a quantity of water using two tubes at the same time, contrasting
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 Drawing on Math  Tina Cardone
Blog by a public high school math teacher in Massachusetts who has participated in Boston University's PROMYS and the Institute of Advanced Studies' PCMI. Posts, which date back to August, 2011, have included "End of Year Reflections: Geometry Favorite
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 Dr. Math Books  the Math Forum @ Drexel
Featuring Internet references, glossaries, indexes, illustrations, and questions written by actual kids, each can be purchased from Amazon.com via links on this page. The page details the contents of each book: Dr. Math Gets You Ready for Algebra, Dr.
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 Duke University Math Union  Jadrian Miles
The Duke University Math Union (DUMU) writes and hosts the annual Duke Math Meet. Download PDFs of problems and solutions from meets dating back to 1998.
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 Dynamic Number  KCP Technologies, Inc.
Classroomready activities of The Geometer's Sketchpad® for interacting with mathematical objects to develop deep understanding of number and early algebra concepts. Some of this content received support from the National Science Foundation (NSF)
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 Dynamic Web Tools Using webMathematica  Steve Wilson and Mike Martin, Johnson County Community College, Kansas
Interactive Web pages that allow students and faculty to compute and visualize mathematical results directly from a Web browser. Primarily for undergraduate courses, the pages are grouped by categories and a given page may be listed under several categories
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 Early Algebra, Early Arithmetic  TERC and Tufts University
The Early Algebra Project examines young learners as they express general relationships among numbers and quantities through written notation, tables, and diagrams. Download PDFs of class materials such as lesson plans and student worksheets; discuss
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 Early Algebra Thinking  Bethany RittleJohnson
Evaluating the role of explanation in mathematics learning — specifically, "why" explanations, or reasoning about why something is true. See, in particular, the abstracts, published articles, and coding schemes and other instruments from RittleJohnson's
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 Easing the Hurry Syndrome  Jennifer Wilson
Blog by a teacher in Flowood (Mississippi) whose course load includes Advanced Placement Calculus and Geometry. Posts often begin with alignments to relevant Common Core State Standard (CCSS) and feature screenshots of TINspire CAS Navigators, with original
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 EasyCalculation.com
Free online mathematics converter, calculators, and other tools for numbers, unit conversions, hexa conversions, decimal conversions, binary conversions, area, trigonometry, analytical geometry, algebra (e.g., group work, Bernoulli inequality, Venn diagrams
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 EdPlace Maths  EdPlace
EdPlace Maths is a is a registered Curriculum Online subscription website that offers over 2000 interactive and printable maths worksheets for KS1 through KS4. Free samples available; paid subscriptions allow users to generate new problems for each worksheet
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 Educação Matemática e Novas Tecnologias  Gravina, Barreto; Universidade Federal do Rio Grande do Sul (UFRGS)
Discusses new technologies as resources for the learning of Mathematics:
software descriptions, lesson plans, articles. In Portuguese.
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 Educational Videos and Software for K12  Allied Video Corporation
Educational videos, software, and Web page services. The math series includes The Assistant Professor math videos (Fractions and All Their Parts; All About Angles; What is Area?; What are Variables?; The Pythagorean Theorem; Which Way is Minus?; The World
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 Education: Mathematics  The Mining Company
Web resource lists of sites: see sciences  physical/computer and, beneath, mathematics by Kristin Matherly, with links to sites "in the spotlight" and topics: Algebra; Applied Math; Books; Business Math; Careers; Calculus; Communities; Competitions;
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 education.ti.com  Texas Instruments, Inc.
Texas Instruments calculator resources and educational solutions: product information; free program downloads; classroom activities, including both a test prep section and a free, collaborative forum for sharing favorite activities that use TI technology,
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 Eduss  Eduss Broadcast & Media
A commercial tutoring program in Math, English, and Phonics for grades 17. It features randomlygenerated exercise sets and questions; subject testing; evaluation and reporting to student, parent, or teacher; and feedback on performance and achievement.
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 EduWare  EduWare, Inc.
Eduware Software lets teachers create exams for any subject or from test banks of Regents questions for Science, Social Studies, Foreign Languages, and Math, using the Wizard Test Maker program. Math subjects include logic, algebra, geometry, the coordinate
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 EduWizardS
Math tutoring and homework help service. Review the educational background, experience, fees, and ratings of tutors, then book a session with voice chat, whiteboard, and textchat. Tutors adjust lesson pace "to a student's ability and guide them where
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 Edwards  Clayton Edwards
Problems, lessons, units, and "starters" by a middle grades math teacher who believes in differentiation and "using a mixture of traditional and reform methods to solidify understanding and engage mathematical minds": integer operations, order of operations,
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 Effortless Algebra  maranGraphics Inc.
Flip and skip through the 305 pages of Effortless Algebra online. Laid out with a "visual grammar," this book covers fractions, exponents, matrices, polynomials, and radicals; solving basic equations, quadratic equations and inequalities; graphing linear
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 Eggbrain Productions  John P. Perna
A Flash website where young people can test themselves on a variety of subjects,
especially mathematics. Interactive quizzes on basic operations, basic algebra, fractions, simple geometry, etc.
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 Ejercicios Resueltos de Matemáticas  Sergio De Los Santos
Ejercicios resueltos para bajar (en forma Excel): Fórmulas, Aritmética; Álgebra; Trigonometría; Geometría analítica; Cálculo, Estadística, y Física.
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 Ejercicios y Problemas de Matemática  Pablo Mateus
Ejercicios y problemas de números (natural, entero, racional, real), estadística, ecuaciones, funciones, análisis combinatorio, probabilidad, trigonometria, geometria, y más. También, um glosario y consejo sobre pruebas
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 Elementary Math Enrichment  Beth Schaubroeck
Free mathematics enrichment materials for accelerated 4th and 5th graders. The 70 lessons, grouped into 12 different units, include solutions and teacher guides: Ancient Mathematics (Mayan math, in base 20; and Egyptian math, which lacks zero), Baseball
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 Elementary Problem of the Week  Department of Mathematics, Southwest Missouri State University (SMSU)
Word problems in number patterns, algebra, geometry, and other topics. Read the solution to the most recent problem, and archives of previous problems and their answers.
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 The Element: Science and Math  Deja.com
Searchable archives of math and science newsgroup postings. This community aims to share resources and give people an easy way to ask questions within relevant newsgroups, providing broad discussions of mathematical concepts from beginning to advanced
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 Elevated Math  Elevated Lab Press
Instructional math videos, aligned to the Common Core State Standards (CCSS), enlivened with multiple voices as well as graphic and cartoon animation. This iPad app, which includes a whiteboard for working out math problems, comes with two lessons and
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 Ellipsis Math  Dr. Valerie J. Henry
A curriculum for basic math facts that "incorporates research on best practices from countries around the world as well as cognitive research on memory and retrieval." Sample algebra word "wall cards"; browse and subscribe to the Math Motivator newsletter;
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 eMathHelp
View worked solutions to problems, or submit your own to WyzAnt.com tutors. See also eMathHelp's notes on prealgebra, algebra, calculus, differential equations, and more.
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 Emaths.Info  Vinod Sebastian
Math tools, formulas, tutorials, videos, tables, and "curios," such as the unusual properties of 153, 1729, and 2519. See in particular Emaths' interactive games, which include the N queens problem, Towers of Hanoi, and partition magic, which finds a
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 The EMPower Project  TERC
Extending Mathematical Power: A Math Curriculum for Adults, extends school mathematics reform to currently underserved populations so that they more effectively engage mathematical demands at work, at home as parents and caregivers, in the community,
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 EnableMath  Art Bardige, Enablearning, Inc.
EnableMath helps students learn and understand arithmetic and algebra with Webbased adaptive/mastery practice and visualization of concepts. Free student trial, free for educators.
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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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 Entersoft
Instructional videos and slides for sale: Central Board of Secondary Education (CBSE) 10th maths, Vedic mathematics, and more.
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 Environmental Issues: A Mathematical Modeling Approach  Jan Pearce, Mathematics and Computer Science Department, Berea College
Assignments, syllabus, and other classroom materials for this course that discusses the state of the planet. "Local and global issues such as air, land, and water pollution; energy production and consumption; forest, wetland and other resource management;
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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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 Equations Calculator
Key in equations up to the third degree, then click the blue "calculate" button for this online calculator to find solutions to the unknowns.
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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 Wizard: Algebraic Equation Solver  Bogdan Kobets
The program allows you to solve algebraic equations in the automatic mode. You just enter an equation in any form without any preparatory operations. Step by step Equation Wizard reduces it to a canonical form performing all necessary operations. After
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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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 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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 Escuela Virtual
From Mexico, a nonprofit organization offering a collection of links and documents in Spanish for students and teachers in secondary school. You can also write to someone who can answer your questions about homework or anything about school. Look for
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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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 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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 Euclid's Algorithm, Heron's Algorithm, Calculation of Pi (MSTE)  Kyte, Moore, Finch; University of Illinois at UrbanaChampaign (UIUC)
Problem (by HansGeorg Weigand): Euclid's Algorithm gives you the greatest common divisor of two natural numbers; explain the algorithm. Given two numbers (e.g. 121 and 33), calculate the gcd(121,33) (in EXCEL you need the "ifcommand"). Heron's Algorithm
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 Everyday Mathematics: A Parent's Handbook K5  Oswego School District
Classroom routines, standards by grade level, examples, glossary, and other resources. Learn about number families, number stories, games such as factor captor, and algorithms such as addition by partialsums, subtraction by countingup, lefttoright,
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 ExamHelp  Anamika Sinha
Log in to generate math worksheets to print out or solve online with autoscoring, and to participate in web contests. ExamHelp has also blogged since October, 2010.
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 ExcelGrade eLearning
Online tutoring in math, science, and English, using a proprietary headset and whiteboard. Details, including testimonials and pricing, on the web.
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 Excel Math  Brad Baker, Janice Raymond, et al.
A curriculum that presents math in a spiraling fashion for kindergarten through sixth grade students. Features include selfcorrection through Excel Math's CheckAnswer system, which allows students to check their own work. Download a sample packet or
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