- Curriculum Focal Points - National Council of Teachers of Mathematics (NCTM)
"Curriculum Focal Points for Prekindergarten through Grade 8 Mathematics: A Quest for Coherence" was released on September 12, 2006. You can view the complete document and related resources on the Curriculum Focal Points section of the National Council
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- Curriculum Guides: Math & Science - Star Tribune, Minneapolis/St. Paul, MN
The newspaper provides students with opportunities to apply their math skills to real-life problems and to read up-to-date scientific information. Math You Can Bank on: real-life money and consumer skills; Mathematics in the News: from the simple calculation
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- Curriculum Issues - Beauregard Parish (Louisiana) Public Library
Links to sites with information about the new New Math, whole math, whole language, and traditional curriculum resources
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- Curry K. Software - Curry Kenworthy
Shareware for Education and Productivity: Pillbug Golf (Mac - learn about points, slopes, and angles while you putt); Snakey Math (Mac - the basic operations, arcade style); Galactic Geometry 3D (Windows - calculate volume and surface area of 3D objects
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- Curry's Paradox - Interactive Mathematics Miscellany and Puzzles, Alexander Bogomolny
A bewildering dissection paradox wherein recombination of 4 pieces cut of a rectangle produces a rectangle of a different size. Borders geometry and algebra. Accompanied by a Java illustration.
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- Curvature of Surfaces (Geometry and the Imagination) - Conway, Doyle, Gilman, Thurston; The Geometry Center
If you take a flat piece of paper and bend it gently, it bends in only one direction at a time. At any point on the paper, you can find at least one direction through which there is a straight line on the surface. You can bend it into a cylinder, or into
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- Curves on Baseballs - Ivars Peterson (MathTrek)
It's that time of year again (at least in North America), when the thoughts of many sports fans turn to baseball. Over the years, the game has also attracted the attention of mathematicians and statisticians intrigued by the rules, geometric considerations,
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- Cutting Corners - Ivars Peterson (MathLand)
Go to just about any college campus or public park and you're bound to see two kinds of trails: "official" paths defined by paved or gravel surfaces and "unofficial" routes trodden into the grass or dirt marking where pedestrians have preferred to walk
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- CYBERCHASE Online - Educational Broadcasting Corporation (PBS.org)
Companion site to CYBERCHASE, PBS's animated math adventure series, intended to foster math literacy and problem-solving skills for kids ages 8-11. Play interactive games or practice with tools such as the talking calculator, crack challenging puzzles,
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- Cyberkidz - Chato BV, touchscreensoftware.nl
A free website with more than 50 games about math, literacy and geography. In English and Dutch.
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- Cyberkidz.net - Chato BV
Online educational games for primary schools, widely used in the Netherlands and recently translated into English.
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- Cyberpapy - Boulanger
Posez votres questions des devoirs dans les forums; des "cyberpapys" répondent.
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- Cyberspace and the Classroom - SageNet
A June 1998 article collecting individual teacher and parent views of the effects of technology in the classroom, the best ways to use technology, and some favorite sites to visit in pursuit of education.
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- Cylinder Formulas (Ask Dr. Math FAQ) - Math Forum
Formulas for finding the surface area and volume of a general cylinder and a right circular cylinder.
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- Daeron's Java - Daeron Meyer
Numerous applets, created by a former technician at the Geometry Center, can be enjoyed here if you have a Java enabled browser. Math-related creations include a 3D viewer; Real time function graph; Rotating Red Triangle; Circle Text; and links to other
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- Daily Desmos - Anderson, Dan; Fenton, Michael; and Lanier, Justin
A daily challenge to reproduce a given graph using Desmos or some other graphing calculator. Teachers Anderson (NY), Fenton (CA), and Lanier (NY) rate the plots by difficulty. Also available from http://dailydesmos.blogspot.co.uk/.
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- The Dalton School - New York, NY
Founded in 1919, the Dalton School is committed to educating students in accordance with the Dalton Plan developed by Helen Parkhurst in the progressive spirit inspired by John Dewey during the early 20th century. Curriculum includes: First Program, Middle
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- Dancing Chaos - Ivars Peterson (MathTrek)
Music, dance, and chaos... The image on the computer screen resembles a delicate, stylized butterfly with translucent wings held lazily askew. It's called the Lorenz attractor, named for meteorologist Edward N. Lorenz of MIT, who in 1963 discovered this
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- danicamckellar.com - Danica McKellar
From the author of the books for middle school girls, Math Doesn't Suck: How to Survive Middle School Math without Losing Your Mind or Breaking a Nail, Kiss My Math: Showing Pre-Algebra Who's Boss, and Girls Get Curves. Read about McKellar's voice-over
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- Daniel Willingham
From the author of Why Don't Students Like School? and When Can You Trust the Experts? (subtitled: "How to tell good science from bad in education"). See, in particular, Willingham's articles, such as "Why transfer is hard," "Why students remember or
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- DapJ Music
Rap music for adolescents struggling to learn and retain math concepts: "Fractions Are Division Problems"; "Keep, Change, Change"; "Properties"; "First, Outer, Inner Last"; and more. The educationally based music production company provides Common Core
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- DareWare: Educational, Multimedia and Java Games
Educational games and multimedia products (free demo versions downloadable), Java games, "This Week in U.S. History", and a brief list of other shareware sites.
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- The Data and Story Library (DASL)
"Dazzle," an online searchable library of datafiles and stories that illustrate the use of basic statistics methods, providing data from a wide variety of topics so that statistics teachers can find real-world examples that will be interesting to their
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- Database of Number Correlations - James Barton
Partitionings, prime factorizations, polygonal numbers, and other data about each of the numbers one through one thousand, as well as connections to "various material and occult phenomena." See also Barton's magic square that has interesting prime factor
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- Data Games - KCP Technologies
As students play Data Games, they generate data that they must analyze to win the games. Supporting materials include a student worksheet; teacher guidelines that correlate the activity to the Common Core State Standards for Mathematics (CCSSM); and videos
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- The Data Library - Pat Daley
Ongoing data-sharing projects, downloadable Excel spreadsheets, and other sources of data on the Web. Collaborative Projects - specific data collection projects that teachers and their students may become a part of; Data Sets that can be downloaded as
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- Datamath Calculator Museum - Joerg Woerner
Historical calculators and educational toys, primarily from Texas Instruments. History of calculators, technical details, many interesting sidelights, including downloadable emulators.
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- Data Paint - Man Machine Interface, Inc.
Statistical utility software for for MS windows 95, 98, NT4.0, 2000, that uses GUI (Graphical User Interface) language to link charts, graphs and statistical information about selected groups of data. For each graph and statistics window, there is a corresponding
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- Datasets (Exploring Data) - Rex Boggs, Education Queensland
Datasets that support the activities, worksheets, assessment, and articles in the
Exploring Data website, each identified by topic and available in three formats: Excel 4.0, NCSS Jr. 6.0, and Tab Delimited. Datasets include: 1970, 1971 US Draft Lotteries;
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- DataStreme Atmosphere - American Meteorological Society
A major precollege teacher enhancement initiative of the American Meteorological Society (AMS). Its main goal is the training of K-12 Weather Education Resource Teachers who will promote the teaching of science, mathematics, and technology using weather
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- DAU Math Refresher Tutorial - George Mason University
An interactive tutorial that uses a subway map as a metaphor for moving through the lessons, giving a comprehensive view of basic mathematics, covering arithmetic, fractions, exponents, logarithms, quadratic equations, series, functions, limits, domains
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- Dave's Geometric Pix Gallery - David Joyce; Dept. of Mathematics & Computer Science, Clark University
Mandelbrot and Julia sets, with a generation form and an Explorer on which you can point and click to get more refined images;
Newton Basins and a form to generate them; a page describing tiling the hyperbolic plane; some wallpaper groups; a gallery
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- Dave's Math Tables: Areas, Volumes, Surface Areas - David Manura
Formulas for and diagrams of: areas of polygons (square, rectangle, parallelogram, trapezoid, circle, ellipse, triangles); volumes of polyhedra (cube, rectangular prism, irregular prism, cylinder, pyramid, cone, sphere, ellipsoid); surface area (cube,
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- The David Mulhall Centre - David Mulhall
Site with resources and suggested treatments for people with Dyslexia, Dyscalcula, Dyspraxia and Attention Deficit Disorder. Extensive site, linking to The David Mulhall Centres in London and the UK.
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- Davitily Math Problem Generator - Nguyen, Ly; and Pardue, David
Create worksheets and tests, including options for multiple choice, printable versions, and answer keys. Click to insert pre-worded questions in basic math, algebra, and geometry, the parameters of which vary randomly. Requires JavaScript. Also available
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- Daylight Savings Time - Jim Loy
A short explanation of Daylight Savings Time in the United States.
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- Day Of The Week Of Any Date - Jim Loy
An explanation of how to figure the day of the week for any date, with some detailed shortcuts and some tables you might memorize.
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- Dear Marilyn, About Leap Years (Math Chat) - Frank Morgan, MAA Online
Your explanation [in Parade Magazine] of September 13, 1998 that we may need to skip a leap year EVERY FEW THOUSAND YEARS because the tropical year (about 365.2422 days) is a bit shorter than the average calendar year (365.2425 days) neglects CHANGES
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- Deberes matemáticas: Ejercicios y problemas de matemáticas resueltos paso a paso. - FORTEC, Formación y Tecnología S.L.
Herramientas didácticas específicas para la enseñanza y el aprendizaje de las matemáticas de la E.S.O. Ejercicios, problemas, exámenes, temarios, todos resueltos y explicados paso a paso. Por suscripción.
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- Decimal Coins of the UK - Tony Clayton
The change to decimal coinage: Decimalisation Day. D-Day was February 15th 1971. On that day the United Kingdom changed from the centuries old tradition of using 12 pence to the shilling and 20 shillings to the pound to a new decimal 100 new
pence to
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- Decimal numbers (Middle School Math) - Homeworkhelp.com, Inc.
A lesson on decimals: What is a decimal number? Converting fractions to decimals, and decimals to fractions; Adding and subtracting decimal numbers; Multiplying decimal numbers; Dividing decimal numbers; Rounding.
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- Decimal Places on a Number Line - NASA Lewis Learning Technologies Project
Decimal places: On a number line, which of the following numbers would be the farthest to the right? 0.001, 0.0015, 0.00099, 0.0005. A detailed answer is provided. From NASA's 9th Grade Math Proficiency Test.
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- Decision Development Corporation
Software for K-12 students and teachers, for all platforms. Math software included separately and as part of other product lines. (Gigamath Playground and Junior Gigamath Playground offer word problem practice for ages 7-14 and 4-8 respectively; Ellen
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- Decision Making Information - Model Education Systems Associates: MESA, Inc.
MESA specializes in the development, implementation and use of decision support systems and related quantitative information resources, especially quantitative tools for research, evaluation and policy analysis directed toward children and their living
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- Deep in the Jungles - Ivars Peterson (MathTrek)
Humans are predisposed to seeing order and meaning in a world that too often presents random choices and chaotic evidence. Random events sometimes get linked into a meaningful, though ultimately bogus, scenario... At the same time, the mathematics of
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- Deepwater Horizon Incident - The National Oceanic and Atmospheric Administration (NOAA)
NOAA has put together a site full of resources about the Deepwater Horizon oil spill in the Gulf of Mexico. In the left margin, choose "Information for: Students and Teachers" to access data sets as well as articles for the classroom, such as a Q&A that
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- Defining Geometric Formulas (Ask Dr. Math FAQ) - Math Forum
Definitions of two- and three-dimensional figures in general, and a note on dimensions.
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- The Definitive Four Fours Answer Key - David A. Wheeler
From 0 up to 40,000, whole number mathematical expressions that use only common mathematical symbols and exactly four 4s. Wheeler offers his solutions in three different formats: an abbreviated list of answers; a text file of results, mathematical expressions,
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- Delaware State Data Center - Delaware Economic Development Office
A focal point for the distribution of census information in Delaware and for the dissemination of other information from the federal government, state government and other sources, coordinating the use of census and other data for economic development.
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- Deliberative Discourse Idealized and Realized: Accountable Talk in the Classroom and in Civic Life - Sarah Michaels, Catherine O’Connor, Lauren B. Resnick
An article in PDF format. Abstract: Classroom discussion practices that can lead to reasoned participation by all students are presented and described by the authors. Their research emphasizes the careful orchestration of talk and tasks in academic learning.
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