 Council of Presidential Awardees in Mathematics (CPAM)
An organization whose members are recipients of the Presidential Award for Excellence in Mathematics Teaching, a program established in 1983 by The White House and sponsored by the National Science Foundation (NSF) to identify outstanding science and
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 Countdown!  Objective Consulting Inc. (OCI)
Calculate the number of seconds between any two events: find out how long it will be until the millennium, until your birthday, or simply how long you have been alive. Answers are also expressed in days, hours, and minutes.
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 Counting Cards  Chris Taylor
A teaching aid that uses simple graphic designs on cards to represent different place values and numbers, from 1 up to one million, for teaching addition, subtraction, multiplication, division, and place value concepts. The site offers a teachers guide,
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 Counting to Calculus: Mathematics  William K. Bradford Publishing Co.
Math software, printed supplements, workbooks, textbooks, posters, and teacher tools available for Elementary, Middle and Secondary math curriculum.
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 Count Madness Number Puzzles  James E. Garner
Cards with questions covering a wide range of subjects, each of which can be answered with a counting number. Answers are upsidedown on the card. Examples and ordering information provided on site. Teacher's copy available.
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 Count On  Department for Education and Employment, UK
Activities and resources  some simple and some fancy  for parents, teachers, and students. Resources offers, among other things, guides: to mathematical misconceptions; for parents helping with homework; for promoters of math fairs; and for providers
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 Count Us In!  Australian Broadcasting Corporation
Fifteen colorful counting and math games designed to help young children understand basic number concepts. Each game has directions and some have levels of difficulty to choose from. Number concepts include: Comparing and Classifying; Patterning; Counting;
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 Course Project Suggestions (Geometry and the Imagination)  Conway, Doyle, Gilman, Thurston; The Geometry Center
An list of suggestions for projects in geometry, topology, symmetry, making geometric solids, calendars, spherical and hyperbolic trigonometry, puzzles, models, etc. Projects were to be exhibited at the Geometry Fair at the end of the course.
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 CourseServer  Jud Cornish; Fairbanks Country Day School, San Diego, CA
A Webhosted math problem generator that allows you to select from thousands of different problem types and automatically generate problemandanswer worksheets in your browser that can be printed out. Choose from a list of courses from Grade 1 (beginning
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 Crafty Puzzles  James Cole, The Crafty Puzzles Company
A U.K. establishment selling wooden puzzles of all sorts: jigsaw puzzles, puzzle boxes, brain teasers, models, and functional pieces.
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 Creative Problem Solving  Rob Eastaway
Eastaway's "portfolio" of interests includes short descriptions of his school talks, newspaper articles, and books he has authored or coauthored, such as Maths for Mums and Dads, The Hidden Mathematics of Sport, How to Remember Almost Everything, Ever,
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 Crewton Ramone's Blog of Math  Crewton Ramone
Ramone's blog, which dates back to July, 2009, has included posts  many with video  such as "Fractions Despite SPED," "Why Invert and Multiply," "4 Year Old Math Enrichment," "Fractions and Addends," "Fractions and Autism Do in Fact Mix," and "Fraction
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 Critical Evaluation Information  Kathy Schrock's Guide for Educators, Discovery School
With the advent of the World Wide Web and the huge amount of information it contains, students need to be able to evaluate a Web page for authenticity, applicability, authorship, bias, and usability. To help teachers get students started with this process,
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 Critical Issues in Mathematics (NCREL)  Pathways to School Improvement
Articles from the North Central Regional Educational Laboratory (NCREL). The Significance of the NCTM Standards; Ensuring Equity and Excellence in Mathematics; Locating, Using, and Integrating InternetBased Mathematics Materials; Providing HandsOn,
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 Critical Thinking Books and Software
Critical thinking books and software for home and classroom for use in mathematics, science, language arts, social studies, and more. Search for Content Area Mathematics from the classroom catalog or the home catalog.
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 Critic of Technology in Schools Faces Tough Audience  Pamela Mendels
From the New York Times column on Education, an April 1998 report on public opinion of the views of Todd Oppenheimer (author of "The Computer Delusion", which apperared in the Atlantic Monthly magazine), from a public meeting concerning technology in
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 CROC'Sciences: le net.magazine de la pédagogie des sciences  P. Lambert
Un mensuel faisant le tour des sites scientifiques d'intérêt
pédagogique, soit pour la construction d'un cours, soit pour les
élèves euxmêmes. Chaque numéro comporte 6
catégories: Mathématiques,
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 CrossAge Tutoring  Marah Fortson; Math Forum
An annotated bibliography: articles to help teachers deal with a classroom of learners with different abilities, different strengths and weaknesses, who are at different levels academically, behaviorally, and socially. The task of the teacher is a challenge,
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 CS Bits & Bytes  The National Science Foundation
CS Bits & Bytes highlights innovative computer science research, often at the intersection with other disciplines, and includes profiles of the individuals in the field, links for further exploration, and interactive activities. Past issues of the
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 CSMC: Center for the Study of Mathematics Curriculum
An NSFfunded project serving the K12 educational community by focusing scholarly inquiry and professional development around issues of mathematics curriculum. Major areas of work include understanding the influence and potential of mathematics curriculum
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 The CTK Exchange  Interactive Math Miscellany and Puzzles, Alexander Bogomolny
A page devoted to questions and answers concerning Bogomolny's pages and math in general. Postings are approved by Bogomolny, and usually answered by him, although they may be answered by the general public as well. Posting topics vary all the way from
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 CTK Math Games for Kids  Interactive Math Miscellany and Puzzles, Alexander Bogomolny
This site presents a collection of Javabased interactive games and puzzles with mathematical contents and a few practice exercises disguised as games. Alexander Bogomolny, the site's author, writes, "There are a few games whose purpose is to allow for
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 CubeIt  Education Development Center, Inc. (EDC)
A math group activity: you will need fifty cubes per group. Gather sugar cubes, wooden cubes, units from Dienes blocks or Cusinaire rods, or any manipulative that has a cubical shape. Students will: estimate the dimensions of the largest cube that can
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 Cube Roll  Cary and Michael Huang
Use the arrow keys to steer a cube along a path of squares towards a final square. Each successive level poses new restrictions based on which faces of the block can or cannot roll onto the square path, making a game out spatial thinking of polyhedral
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 Cubeworld  Hank Gross
Cubeworld: an adventure in solid geometry. This book, with 21 illustrations by the author, is in the tradition of Edwin Abbott's classic Flatland and explores what might happen if the Earth were transformed into a cube. Gravity is different, rain falls
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 CUE (ComputerUsing Educators)  CUE, Inc.
A nonprofit California educational corporation that supports an active membership of more than 10,000 professionals from within and outside California, in schools, community colleges, colleges, universities, related institutions, and related fields.
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 CueThink
Makers of social, collaborative, interactive learning environments such as CueThink, a peertopeer iPad application for grades K12.
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 Cuisenaire Math  ETA/Cuisenaire
From the makers of Cuisenaire Rods: Connecting Cuisenaire Rods, Cuisenaire Roddles (board games and puzzles that emphasize spatial reasoning skills), Cuisenaire Rods for the Overhead, Magnetic Cuisenaire Rods, and other manipulatives. Publications include
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 CUNY Games Network  CUNY Academic Commons
Blog about the pedagogical uses of both digital and nondigital math games, how they improve student success, and how they encourage research and scholarship in the developing field of gamesbased learning. Posts, which date back to July, 2011, have included
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 Curious and Useful Math  Clay Ford
Tricks and rules for quickly calculating certain types of math problems, many from the 1888 book The Carpenter's and Joiner's Pocket Companion. Multiplication Tricks; Division Tricks; Squaring Tricks; Can it Divide...?; Age Math; Bible Numbers; Box Tricks;
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 The Curious Creative: Maths  Tom Barrett
Blog by a former teacher and ICT Subject Leader. Barrett's math posts, which date to back to July, 2006, have included "Addressing the Balance: Multiflyer Times Tables Challenge," "Using Nintendo Wii Sports for Addition and Subtraction," "My Maths Lesson
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 Curricula, Lessons, and Activities  ARTSEDGE
Annotated links on the Internet and additional offline resources highlighting lessons that interrelate the study of math with the arts. Organized into online curriculum, and related online resources of primary resources and indices.
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 Curriculum Development: NSF Awards  Mathematics Education at the Math Forum
A list of math curriculum development projects constructed by means of a text search of the NSF awards database. Each link leads to an abstract of the project, stored at the NSF World Wide Web Server. The first two digits of the numbers that appear to
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 Curriculum Development Projects  Mathematics Education at the Math Forum
The Math Forum's suggested sites on curriculum development in math education, including projects sponsored by the NSF and others.
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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 reallife problems and to read uptodate scientific information. Math You Can Bank on: reallife 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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 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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 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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 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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 DadsWorksheets
Thousands of math worksheets: addition, subtraction, multiplication, and division, including in bullseye and grid formats; fact family math and facts in spiral layout; long division; negative numbers; exponents; order of operations; fractions, graphic
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 Dad's Worksheets  Dad
Dad's Worksheets is a site with strategies and free printable practice worksheets (including answer keys) for elementary math operations.
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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. Mathrelated creations include a 3D viewer; Real time function graph; Rotating Red Triangle; Circle Text; and links to other
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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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 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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 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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 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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 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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 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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