- Clocks and Curvature (Geometry and the Imagination) - Conway, Doyle, Gilman, Thurston; The Geometry Center
The total curvature of any surface topologically equivalent to the sphere is 4 pi. This can be seen very simply from the definition of the curvature of a region in terms of the angle of rotation when the surface is rolled around on the plane; the only
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- Clocks - Bill Finzer, Key Curriculum Press
Two sketches illustrating useful Sketchpad animation techniques. Shows how to move the hour and minute hands at different rates, and how to convert the analog motion of the clock into digital switches.
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- Clockworks: From Sundials to the Atomic Second - Britannica.com
A site about the development of instruments that have measured time over the centuries. Each instrument has a page featuring a description and an illustrated diagram, and most include a QuickTime animation demonstrating how the mechanism works. Iinstruments
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- CLSO-Math - Shad Moarif
Learn math through visual scaffolding, whereby "... a math concept is first understood with the help of visualization, then gradually assimilated as an abstract idea in stages of decreasing visualisation and increasing numeracy." More than 10,000 worksheets
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- Clusters and Decagons - Ivars Peterson - Science News Online
A novel pattern made up of overlapping, 10-sided tiles may serve as a model of how atoms arrange themselves into a quasicrystalline structure.
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- Clutch Hitting - Elan Fuld
Download the PDF of a study examining whether clutch (or choke) hitters exist in professional baseball. Using play-by-play data, Fuld found substantial evidence that clutch hitters exist in Major League Baseball, when sacrifice flies are considered as
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- CMAP - C-Based Mathematical Application Programming Environment - Dr. Kinh H. Ha
Free, educational software that provides a visual, comprehensive, and compact environment for numerical computation, graphics, and rapid development of computational software. Joining this Yahoo! Group enables download of the program and notification
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- CME Project - Center for Mathematics Education, Education Development Center, Inc. (EDC)
The CME Project is a four-year, NSF-funded, comprehensive high school mathematics program that is problem-based, student-centered, and organized around the familiar themes of Algebra 1, Geometry, Algebra 2, and Precalculus. The CME Project sets as its
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- CMP Software - Connected Mathematics Project, Michigan State University
Downloadable software designed to accompany CMP units. For the Factor Game winning strategies involve distinguishing between numbers with many factors and numbers with few factors; students analyze game strategies and are introduced to the definitions
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- CMP Unit Organizers - Art Mabbott
To introduce students to new units from the Connected Mathematics Project (CMP), Art Mabbott has developed a set of Unit Organizers. Adapting work done by B. Keith Lenz, of the University of Nebraska, Mabbott has also shared his MS Word documents with
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- CMS - Science Fair Page (Cyberspace Middle School) - Dr. Larry Dennis; Department of Physics, Florida State University
A page for students who are using the World Wide Web to gather information on science fair projects. It includes: a help desk; practical hints for selecting and completing a project; descriptions of possible science fair projects; planning a class project;
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- Coastal Computer Company
An educational software company. Math titles, AlgebraMAKER and MathMAKER, drill students in basic skills, explaining the solution to each problem. Samples of these programs are available for download.
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- Coaster Connections - Matt Gehrett, Leon Ryder; SCORE Mathematics
What science and math exist in a roller coaster? Enter the world of roller coasters via hands-on activities, Internet information, online experts, and computer simulations. Aligned to the California State Standards. From the Schools of California Online
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- CoCoA System - Robbiano et al.; Italy
A free, multi-platform software system for running computations in commutative algebra. CoCoA's principal area of expertise is operations over commutative rings of polynomials; it can readily compute Gröbner bases, syzygies and minimal free resolutions
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- CO Combinatorics (Front for the Mathematics ArXiv) - Univ. of California, Davis
Combinatorics preprints, from the U.C. Davis front end for the xxx.lanl.gov e-Print archive, a major site for mathematics preprints that has incorporated many formerly independent specialist archives. Search by keyword or browse by topic.
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- CODEE Learning Assets Library - Consortium for Ordinary Differential Equations Experiments (CODEE)
Electronic versions of the 1992-1997 CODEE newsletters, which published pedagogical articles, lesson plans, computer experiments, and software reviews related to ODEs. The Consortium for Ordinary Differential Equations Experiments (CODEE) seeks to disseminate,
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- C*ODE*E - Mathematics Dept., Harvey Mudd College
Online archives of the newsletter of the Consortium for Ordinary Differential Equations Experiments, which provided a regular source of ideas,
inspiration, and experiments for instructors of ODEs between 1992 and 1997. Search back issues by issue, keyword,
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- "The Code War" - Beyond Discovery - Dana Mackenzie et al.; National Academy of Sciences
An online science article from the Beyond Discovery series that explores the trail of developments in the branch of mathematics known as number theory that led to modern-day encryption techniques. Contents include: Early Ciphers; The Enigma Challenge;
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- The Coffeecup Caustic - Roy Williams
You are drinking from a cylindrical cup in the sunshine. Sometimes, when the sun shines into the cup, you can see a crescent of light as the sunshine reflects from the inside of the cup onto the surface of the drink. This Java applet illustrates the optics
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- Coffee Hour Problem of the Week - Matthew McMullen
Classic and "found" problems, as well as original challenges, in number theory, logical reasoning, statistics, calculus, geometry, and algebra. McMullen has posted PDFs of the PoWs, as well as their solutions, since 2007.
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- Cognition Learning and Development Lab - Nicole McNeil, University of Notre Dame
The Cognition Learning and Development (CLAD) Lab studies how children think, learn, and solve math problems, in pursuit of the mechanisms involved in the development of quantitative reasoning, symbolic understanding, and problem solving. What basic cognitive
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- cognitive acceleration - Cognitive Acceleration Associates
Cognitive acceleration (CA) emphasizes "'big ideas' or organizing conceptual strands in mathematics, rather than procedures and algorithms." Published collections of math lessons include Thinking Maths, Primary Cognitive Acceleration through Maths Education,
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- Cognitive Apprenticeship (Learning and Mathematics) - Collins, et al.; Math Forum
In a chapter entitled "Cognitive apprenticeship: Teaching the crafts of reading, writing, and mathematics," in the 1989 book Knowing, learning, and instruction: Essays in honor of Robert Glaser, Allan Collins, of BBN Laboratories, and John Seely Brown
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- Coin Flip for Ben Franklin's 300th Birthday - The Franklin Institute
The Franklin Institute Online invites students around the world to help commemorate Ben Franklin's 300th birthday on January 17, 2006, by participating in a common scientific enterprise. Links on the page include: Practice Worksheet (in PDF format), Results
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- Coin Flipping - Ken White
A page that allows you to gather data on virtual coin-flipping experiments. Includes access to data on past coin flipping and an article about coin flipping.
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- Coin Flipping - Math Forum, Ask Dr. Math Common Question
A selection of answers to questions about flipping coins, such as "What is the probability of getting two heads and four tails?" and "What is the probability of getting two heads on four flips of an unbiased coin?"
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- Coin Problems - Math Forum, a Classic Problem from the Ask Dr. Math FAQ
Tony has 11 more nickels than quarters. How many coins does he have if the total value of his coins is $2.65?
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- Coins and a Balance Scale - Bennett Haselton
You have twelve coins and a balance scale. One of the coins does not weigh the same as the other eleven, but you don't know if the odd coin is heavier or lighter than the others. How can you determine, in three weighings, which coin is the odd coin?
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- Coins, Art, and Math in North Bay - Ivars Peterson (MathTrek)
North Bay's Nipissing University hosted the annual meeting of the Ontario
Association for Mathematics Education, which attracted about 650 math teachers. As one of the featured speakers, I presented a talk on randomness. My examples included slot machines,
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- Collaborative Learning Discussion Archive - Math Forum
A special project hosted by the Math Forum, this discussion concerned collaborative learning, its definition, its effects on teachers and students, administration and assessment issues, and materials and resources. The discussion began as e-mail conversations,
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- Collaborative Learning - Mathematics Education at The Math Forum
A collection of links to collaborative and cooperative learning resources on the Web, including articles, discussions, and teaching techniques that emphasize collaboration.
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- Collaborative Maths Resources - Collaborative Learning Project
Freely downlaod PDFs of "talk-for-learning" lesson plans such as "12 and 24 hour Card Sorting" (clock times), "Buy a Ted" (collect all the parts of a teddy bear, which introduces the concepts such as exact amounts and making change), "Factors Four in
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- The Collage Theorem - Cut the Knot!, Alexander Bogomolny
To find an IFS whose attractor is "close to" or "looks like" a given set, one must endeavor to find a set of transformations - contraction mappings on a suitable set within which the given set lies - such that the union, or collage, of the images of the
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- The Collapsing Compass - Godfried Toussaint
There has been considerable interest during the past 2300 years in comparing different models of geometric computation in terms of their computing power. One of the most well-known results is the proof in 1672 due to Mohr that all constructions that can
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- Collatz 3n+1 Problem Structure - Ken Conrow
Pages of observations posted to stimulate further research.
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- Collatz Conjecture Calculation Center - Klaas IJntema
JavaScript tools to investigate the Collatz problem, as well as general mathematics tools and some recreational mathematics. Some programs are freely downloadable.
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- Collecting Data and Graphing (SMILE) - John Ramsey, Jr., Teacher's Academy For Math and Science
A multi-level lesson designed to teach students to see the relation of a student's arm span to his or her height; compare data with classmates; construct a graph and plot data; work in pairs cooperatively; learn to use a meter stick; and count the number
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- A Collection of Applets - Sione Palu
Java applets for classroom use. Those created so far include: Polynomial Roots; Frequency Distribution; Completing the Square; Polynomial Fitting; Statistical Analysis; Number Works; and Polynomial Differentiation. Read about Palu's background and educational
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- A Collection of Assessment Strategies - Alaska Department of Education & Early Development
Each section of this page describes and analyzes a particular type of assessment strategy, then lists sources of further information. Following those discussions, samples show how each type of strategy might be used at various grade levels. The given
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- The Collection of Computer Science Bibliographies on Mathematics - Alf-Christian Achilles; Computer Science Bibliography Collection
A collection of bibliographies of scientific literature in computer science from various sources, covering most aspects of computer science. Math journals range from Mathematical Physics to the Mathematics of Computation to Applied Mathematics and Computation.
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- A Collection of JavaScript E-labs Learning Objects - Hossein Arsham
A basic calculator for numerical experimentation, as a learning tool for the fundamental mathematical concepts and functions (as students do in, e.g. Physics labs.) Includes powers, exponents, square roots, factorials, trig functions. Link to further
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- College Algebra - Marsha Austin, Oklahoma City Community College
A college algebra course to provide students with an understanding of the general concepts of relation and function and specifically of polynomial, exponential, and logarithmic functions; with the ability to solve system of equations by utilizing matrices
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- College Algebra Online - University of North Carolina, Wilmington
An introduction to the online version of the College Algebra course offered by Jeff Brown at UNCW. Information on the course content and structure is available here. Guests may view selected lessons from the course, with Java interactive activities, illustrations,
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- College Algebra PowerPoint Presentations - George Mathew
Free PowerPoint presentations on topics in early college algebra.
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- College and University Level Mathematics - Math Forum
Selected Internet resources for College students: links to Opportunities for undergraduate research; Internet activities and projects; Mailing lists and newsgroups; Organizations and departments; Professional services, address lists, etc.; Publications;
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- College Board Online - ETS
Sample tests and auto-scoring questions; auto-replying financial aid worksheets; dowloadable AP course descriptions; online SAT registration, education materials shopping; announcements; career, scholarships, college searchers; bimonthly net tips; maintained
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- College-Cram.com - The Smartacus Corporation
Fee-based service providing tutorials on a number of topics including math, generally at the early college level. Tutorial topics are visible without a subscription.
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- College Entrance Exam Math Prep - EduCAD
A free, interactive library of the most complex math problem types found on the SAT® or ACT® college entrance exams. The "show next step" button provides a hint about the strategy to take; a correct answer submitted with the "check answer" button
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- College Fund From Great Aunt Betty - Nancy Roeban; SCORE Mathematics
Great Aunt Betty left you $1,000 to go towards your college fund. Now, you will be investing your new found money into a 30 month CD. The account will be automatic, since it will be done through the Web site. Your job will be to calculate the growth of
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- College-Level Geometry - Math Forum
Links to some of the best Internet resources for college geometry: classroom materials, software, Internet projects, and public forums for discussion.
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