- Divisibility Rules - Calculation Tips & Tricks, The Math Forum
Tips for figuring out whether a number can be divided by the numbers 3-13, with a Spanish translation and an explanation of why the rules work by Robert L. Ward.
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- Division by Zero - Dave Richeson
A blog about "math, puzzles, teaching, and academic technology." Posts, which date back to September of 2008 and sometimes introduce original applets, have included "Volumes of n-dimensional balls," "Albrecht Dürer's ruler and compass constructions,"
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- Division Worksheets - Guru Angad Educational Team
Overviews and freely downloadable PDF worksheets on math facts, math families, basic division, and long division, with step-by-step solutions.
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- DLK MathsWork Software
Self-differentiating, topic-specific math software for Windows 3.1 and above, on number, shape and space, and data handling. All of the practice modules have on screen monitoring at three levels. Six problem modules designed to improve users' application
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- Dodecahedron Measures - Paul Kunkel
An investigation of the formulas of the surface area and volume for the dodecahedron. With icosahedron extensions.
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- DO MATH...and you can do anything! - National Council of Teachers of Mathematics (NCTM)
Features grade level-specific mathematical activities that children can do with their families and on their own, as well as links to other sites where children can explore the connections between math and some possible career paths. Also includes a family
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- Dominoes Activity - Suzanne Alejandre
A classroom activity (similar to Pentomino + 1 = Hexomino; a variation on polyominoes) aligned to the NCTM and California Standards, to be explored through manipulatives (paper dominoes). Students explore whether it is possible to cover a 6x5 grid with
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- Doodling and Miracles - Cut the Knot!, Alexander Bogomolny
Almost 100 years ago, Frank Morley proved a curious theorem from elementary geometry that had remained unknown until 1899. With time, the theorem became known in mathematical folklore as Morley's Miracle (Morley's Trisector Theorem is a more mundane term.)
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- Dot Patterns and Sierpinski Gasket - Cut the Knot!, Alexander Bogomolny
How many ways are there to define the Sierpinski gasket (also, the Sierpinski triangle)? The author has counted a respectable 9 but would be happy to learn of more. An applet with rows of digits or circles with colors corresponding to the digits shows
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- Double Bubble Conjecture Proved (Math Chat) - Frank Morgan, MAA Online
Four mathematicians have announced a mathematical proof of the Double Bubble Conjecture: that the familiar double soap bubble is the optimal shape for enclosing and separating two chambers of air. In an address to the Undergraduate Mathematics Conference
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- Doubling Pennies - Math Forum, a Classic Problem from the Ask Dr. Math FAQ
Which is more, a million dollars or a penny doubled every day?
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- Do You Know That... - Interactive Mathematics Miscellany and Puzzles, Alexander Bogomolny
A collection of short essays about over 60 curious mathematical facts and terminology, mostly linked to explanatory or exploratory essays, drawn from various parts of Bogomolny's site, Cut-the-Knot. See page two and page three.
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- doyourmath.com
Interactive practice and learning tests (Pre-SAT, SAT, AP and Calculus), math puzzles, entertaining math for all ages, a math bookstore, and a math expert to answer your questions. Submit your answers to the puzzle of the week and see the archive of past
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- The Drills To Play - Cut the Knot!, Alexander Bogomolny
An exploration of a detail found at the beginning of Kurt Godel's biography by John Dawson, how repetition and practice constitute an integral and necessary part of the learning process; that, by implication, one first conceives an idea, then proves it
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- Dr. Rich's Page o' Math
Math problems in algebra, trigonometry, and calculus, posted more or less monthly (past puzzles, with solutions, are on the Web).
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- Drums That Sound Alike - Ivars Peterson (MathLand)
Peterson writes that physicists and mathematicians have long recognized that the shape of the boundary enclosing a membrane plays a crucial role in determining the membrane's spectrum of normal-mode vibrations. He outlines the progress made on Mark Kac's
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- Dr. Vogel's Gallery of Calculus Pathologies - Thomas I. Vogel; Dept. of Mathematics, Texas A&M University
In learning calculus, students develop intuitive ideas of such concepts as limit, continuity, differentiability, and so on, useful in dealing with simple examples, but potentially a hindrance to deeper understanding of the basic concepts of mathematical
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- DSP First: A Multimedia Approach - McClellan, Schafter, & Yoder
The CD-ROM portion of the book, containing, for each chapter: Demos - quicktime movies, sound files, etc. that help reinforce the concepts introduced in the text; Labs - MATLAB based laboratory exercises for in-depth study of certain concepts and ideas
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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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- Earning 5.5 Percent Interest - NASA Lewis Learning Technologies Project
Mareta put $4,000.00 in a savings account at an annual interest rate of 5.5%. How much interest will the principal earn in 1 year? A detailed answer is provided. From NASA's 9th Grade Math Proficiency Test.
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- Easier Fibonacci puzzles - Ron Knott
Puzzles that are simply related to the Fibonacci numbers....; Brick Wall patterns; Making a bee-line with Fibonacci numbers; Chairs in a row; Stepping Stones; Fibonacci numbers for a change!; Telephone Trees ; Leonardo's Leaps; Fix or Flip; Two heads
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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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- Easymaths - Echelon Systems Ltd.
A UK math site with GCSE tutorials, notes to be used as introductions to topics or for revision; an Exam Bank with exam-style questions and model answers for ages 12-16; book reviews, a Practice Room with practice maths problems and tips for solving them;
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- ecalculus.org: The Calculus Page - Hass, Kouba, University of California, Davis, CA
Resources for calculus students: calculus problems with solutions; sample exams; excerpts from "How to Ace Calculus" (the Streetwise Guide); animations; tips on preparing for exams; mathematics and the job market (professions that use mathematics); and
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- ECC Tutorial - Certicom
Elliptic Curve Cryptosystem Classroom introduces elliptic curves and how they are used to create a secure and powerful cryptosystem: elliptic curve groups over real numbers, over Fp, over F2m, and the discrete log problem. Certicom's 109-bit and other
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- Echecs & Math: Jeux, Exercices et Méthodes - Bernard Faujour
Java et JavaScript pour apprendre la géométrie des tangrams et des polyominoes. Les problèmes incluent questions de logique, et textes et tableaux. Les ressources incluent jeux pour télécharger, et une fabrique d'exercices
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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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- Ed Tech Tools - University of Hawaii
Free, web-based tools for educators, featuring QuizMaker 2.0, which allows users to create and correct on-line quizzes easily and quickly, without any knowledge of HTML. It provides instant feedback to students, and/or package answers in an email that
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- Educational Interests - Keith Lynn
See, in particular, Lynn's Math Modeling Project, which features Java applets to produce quadratic and sine examples; and Dynamics Project, on the Julia and Mandelbrot sets.
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- Educational Videos and Software for K-12 - 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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- EduGain - Ashish Kumar
Practice for CBSE, ICSE and math olympiads with this assessment infrastructure, which generates randomized questions of various types -- objective, descriptive, fill in the blanks, matching, and more. Read daily "bytes" and other articles; register to
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- Edusolution.com - Levi Anthony
Edusolution.com's math center provides New York State Regents Math A, Math B, and Math Courses 1, 2, and 3 exams, with answer keys, dating back to 1999; as well as auto-scoring online math quizzes, a discussion forum for teachers, and New York State standards.
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- Edutest: Online Assessment Resource
Assessment testing based on nationally recognized standards in Math and Language Arts for grades 2-8. Scoring is instant and both parents and teachers can review the tests and the correct answers with their students. The site has some information for
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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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- Eggy's School
A math game for beginning addition: click on the chalk and find the answer to single-digit addition.
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- Egyptian Mathematics - Mark Millmore
A clearly-written description of the Egyptian numerical system, with some practice problems from John Heaton and Pam B. Newberry to test your understanding. Java calculator adds, subtracts, multiplies, and divides in Egyptian numerals.
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- Eighth Grade (AAA Math) - John Banfill
Interactive math exercises, lessons, and games covering basic arithmetic concepts and methods, for eighth grade.
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- Einstein's Big Idea - WGBH Boston
Resources to accompany the PBS broadcast "Einstein's Big Idea," the theory of special relativity: program transcript; teacher's guide; inquiry and articles; and "Interactives, Audio and More," which includes video of ten top physicists each describing
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- Ejercicios Resueltos de Matematicas - GuiaMath
Ejercicios Resueltos de Matematicas, Atencion Personalizada Para Estudiantes de Ingenieria y Licenciaturas. Material En formatos Jpg y Videos Mpg, Tratamos todo tipo de Asignaturas de Algebra y Calculo desde Basico a Superior. Logica, Conjuntos, Funciones,
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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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- Electronic Bookshelf (Mathematics Across the Curriculum) - Dartmouth College
Materials produced by the MATC project are listed on the Electronic Bookshelf. Topics include: Algebra; Calculus and Differential Equations; Engineering; Physical Sciences; Art; Computer Science; History and Geography; Pre-Algebra; Biology, Medicine,
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- The Electronic Encyclopedia of Statistical Exercises and Examples
Supplementing introductory textbooks, the Electronic Encyclopedia of Statistical Exercises and Examples (EESEE) comprises over 80 "real-world" stories, or examples, about the uses and abuses of statistics and statistical inference, drawn from published
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- Electronic Games for Education in Math and Science (E-GEMS) - British Columbia, Canada
Archives of a collaborative effort by scientists, educators, and professional video game and educational software developers to do research on and develop teaching materials that integrate video games and computer-based explorations with existing classroom
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- Elementary Computer Mathematics - Kenneth R. Koehler
An introduction to the mathematics used in the design of computer and network hardware and software. This hypertextbook's goal is to prepare the student for further coursework in such areas as hardware architecture, operating systems internals, application
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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 Math Games - Elementary Math Games
Free educational math games and printable math worksheets.
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- Elementary Math Worksheet Generator - Eduvelop
A web based math generator that creates printer friendly worksheets and worksheets that can be completed online. From Eduvelop, a company that also produces courseware and test-preparation software.
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- Elementary Problem of the Week - Math Forum
A project designed to challenge elementary students with non-routine problems and to encourage them to verbalize their solutions. From 1995 to 2002, solutions submitted from students for the Elementary Problem of the Week were answered by Visiting Math
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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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- Eli's Math and Logic Puzzles and Other Interesting Things - Eli Karplus
A mixed bag of problems, some geared toward the 6th grade level, others to challenge college folk, with answers for a few. Three Men in a Hotel/The Missing Dollar; The Boatman Crossing the River with Fox, Chicken, and Cabbage; Benardete's Paradox; The
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