- Dividing The Plane - Jim Loy
A line divides the plane into two pieces (regions). Draw another line. The plane is now divided into three or four regions. It is three regions if the lines are parallel, four if they intersect. A third line divides the plane into seven regions. Find
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- 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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- Divisibility Rules - Math Forum, Ask Dr. Math FAQ
How can you tell whether a number is divisible by another number (leaving no remainder) without actually doing the division? Why do 'divisibility rules' work?
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- Divisibility Rules to 50 and Beyond - Stephen D.T. Froggatt; Math Forum, Ask Dr. Math FAQ
A quick way of testing primality of larger numbers: the idea of deleting the last digit and adding or subtracting a multiple of the digit from the remaining number can be generalized to test for divisibility by prime numbers up to 50 and beyond.
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- Divisibility War - Diane Reed
A game designed for secondary level students studying basic mathematics to use the divisibility tests to determine whether a number is divisible by 2, 3, 4, 5, 6, 9, and 10.
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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 with Roman Numerals - Jim Loy
Roman numeral division can be very easy or fairly difficult, depending on the two numbers. An example of division by pieces, and a general method using repeated subtraction.
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- Divisor Plot - Jeffrey Ventrella
"We hear of primes described as the 'building blocks' of all numbers. Let's turn that concept on [its] head. Instead, let's think of primes as the negative spaces behind complex objects. Imagine a series of picket fences stacked in front of each other.
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- DIY Calculator - Clive (Max) Maxfield and Alvin Brown
Order the book How Computers Do Math, or preview its table of contents. The book's interactive laboratories guide you in the creation of a simple calculator program to run on your DIY Calculator; its accompanying CD-ROM contains a virtual "Do-it-Yourself
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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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- 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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- Domebook - Tom Camilli
Cardboard and transparent plastic geodesic domes built by children. Students start by constructing paper models, then apply scale factors to construct domes of any size using cardboard or wooden dowels and plastic sheeting. See pictures of classroom projects;
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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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- donalduncan's Channel
Narrated paper and pencil instructional videos -- some, specific to British Columbia's Foundations of Math and Precalculus exams -- on number, line segments and lines, rational expressions, factoring, quadratic functions, functions, exponents, polynomials,
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- Don't Hate No Math - Elio Motella
Advice for students, parents, and teachers. The document called "Lecture" includes sections such as "The causes of your troubles," "It's called metacognition," and "Mental models and propositional representations"; see in particular Part D, titled "An
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- Dositey.com - Dositey Corporation
Interactive lessons, exercises and worksheets, educational games, open-ended questions in Math and Language Arts, and more.
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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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- Doubling the Cube - MacTutor Math History Archives
Linked essay covering the history of and some solutions to the classical
problem in Greek mathematics of doubling or duplicating the cube, also called the
Delian problem; and on proving the impossibility of constructing a solution using only ruler
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- Downloads - Mac - Mathematics - CNET Download.com
Search this site to find a particular piece of software for the Mac, or browse their mathematics listings.
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- Downloads - PC - Mathematics - CNET Download.com
Search this site to find a particular piece of software for the PC, or browse their mathematics listings.
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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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- A Dozen Reasons Why Schools Should Avoid Filtering - From Now On (FNO)
Why schools should not block access to particular sites: filters may not work very well;. they may work too well; they may increase attention to SMUT and spur motivation; their ongoing cost may block better programs from your students; they may create
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- DPGraph (Dynamic Photorealistic Graphing) - David Parker
Software that allows you to: display multiple simultaneous dynamic photorealistic 3D implicit equalities and inequalities, and intersections of their volumes; spin, slice, and view time-dependent (moving) photorealistic surfaces in real time; and construct
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- Dr. Aardsma's Math Drill - Aardsma Research and Publishing
Commercial computer software for giving automatic flashcard-style math facts drills to elementary students. Drills addition, subtraction, multiplication, and division.
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- Dragonfly Web Pages - Miami Univ. of Ohio with the NSTA
Dragonfly is an inquiry-driven magazine published bimonthly during the school year, inspiring children to join with their peers and with scientists in national and international investigations. Dragonfly also publishes poetry, autobiographies, natural
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- Dramatic Results
This non-profit educational arts agency improves students' academic confidence and performance "by stimulating curiosity and fostering creativity through a hands-on, arts-based approach to learning." Dramatic Results specializes in curriculum that integrates
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- DreamCalc for Windows - Andy Thomas
A freeware scientific calculator for Windows, intended to replace standard hand-held calculators. Fully featured range of math, scientific, statistical & financial functions. Supports natural fractions, complex numbers, base-n logic, unit conversions
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- Dream Frequency .com
CGI web applications to calculate the factors of a number, calculate the prime numbers below a number, test a number for primality, calculate a word's position in the alphabetically sorted list, convert hex to ASCII, or convert temperature from celsius
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- Dream Home Mathematics (SMILE) - Dennis W. Montgomery, Lyman Trumbull Academy
A lesson for grades 5-12, designed to teach students to use basic math to determine affordability of a home based on a given income; calculate decimal placement for currency, percentages and interest; estimate affordability based on income; investigate
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- Dr. Freemath - Bob Pawloski, Office of Internet Studies, University of Nebraska - Omaha
Archives of a project where elementary classes asked mathematics questions of the Omaha Free-Net, Project TEAM Internet (UNO), and the Technology Task Force of the Eastern Region Math and Science Coalition. Questions and answers range from "At the speed
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- Dr. Genius - Hilaire Fernandes
Dr. Genius: "Geometry Exploration and Numeric Intuitive User System." The successor of the Dr. Geo Project, this GNU interactive geometry software allows the construction and manipulation of geometric figures. Read documentation, subscribe to the mailing
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- Dr Lamin Tutor Books
Free programs on CD-ROM, produced by Dr S.M Hajsadr (you must pay postage and
packaging if you find them useful). Essential Maths is the first in a series of Tutor Books that aim to make learning mathematics easy and consistently planned. Topics include:
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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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- Dueling Pinwheels - A Geometer's Sketchpad Activity - Cynthia Lanius
Construction directions for rotations, translation, and reflection, with questions to explore and a demonstration sketch to download.
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- Dunham's Math Dictionary - Charlene Dunham
More than 300 Algebra and Geometry math terms, to accompany Charlene Dunham's other pages of course activities (advanced and honors geometry) for Lee Freshman High School.
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- Dynamic Geometry - Goldenberg, Scher; Education Development Center, Inc.
To understand how students construct mathematical ideas in "Dynamic Geometry" environments (tools like Geometer's Sketchpad and Cabri), one needs clear characterizations of the mathematical "raw materials" embodied in the software and how students use
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- Dynamic Mathematics Visualization for Young Learners
Sketchpad in Grades 3-8 - a working conference, held at the University of Illinois at Chicago in February, 2003. Researchers, curriculum developers, and educators began developing a curriculum and software structure around The Geometer's Sketchpad technology
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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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- Dynamische Geometrie Systeme (DGS) - Dr. Dörte Haftendorn
In German. Characteristics and comparisons of dynamic geometry systems; Euklid: characteristics, material, notes, software, lessons; TI-92 calculator Cabri Geomètre materials. You may send for a 40-page booklet on "Dynamic Geometry of Systems"
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- Dyscalculia.org - R. M. Newman
Learn about dyscalculia: definitions, cognitive research, symptoms, diagnosis and best practices, classroom techniques, home learning aids, legal questions, papers such as "Developmental Perspectives on Dyscalculia: Implications for Teaching in the Middle
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- Dyslexia - George Row
A compensium of links to other WWW pages and discussion groups on Dyslexia: basics, organizations, bibliographies, archives, software, research; also special needs education in general; and pointers to general disability information.
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- Dyslexia Online
An online magazine offering information on and resources for dyslexia.
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- Dyslexia Symptoms & Dyslexia Signs - Benetta Strydom
A resource on the symptoms of dyslexia, including the possible effects of
this disorder on math and handwriting.
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- Eagle Geocoding - ETAK, The Digital Map Company
Input an address and the Eagle Geocoder will return the following data: full Zip Code, latitude and longitude, County, Urbanized Area Code, Population Density, Minor Civil Division, Place, Tract, and BlockGroup. You may also request a map with the address
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- Earliest Known Uses of Some of the Words of Mathematics - Jeff Miller, Gulf High School, New Port Richey, FL
An extensive list, with examples, sources, and contributors. These pages attempt to show the first uses of various words used in mathematics. Research is ongoing, and the uses cited should not be assumed to be the first uses that occurred unless it is
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- Earliest Uses of Various Mathematical Symbols - Jeff Miller, Gulf High School, New Port Richey, FL
An attempt to identify the individuals who introduced various common mathematical symbols, along with the dates and name of the document in which the symbol first appeared: symbols of operation; grouping symbols; symbols of relation; fractions and decimals;
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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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- EarthKAM - Sally Ride Science
An educational outreach program of the National Aeronautics and Space Administration (NASA), EarthKAM stands for "Earth Knowledge Acquired by Middle school students." Search the collection of images of specific locations on Earth, as photographed from
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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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- EASI Street to Science, Engineering, and Math (SEM)
Equal access to software and information: an NSF-sponsored project to collect and disseminate information on tools that make these fields more accessible to professionals with disabilities. Online workshops, Webcasts, links to programs for the visually
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