 Charles Babbage Institute of Computer History (CBI)  University of Minnesota
CBI is a research center at the University of Minnesota dedicated to promoting the study and preservation of the history of information processing. As part of its mission, CBI maintains an archival collection available for use by the public that includes
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 Charlie's World  Buildcontent.Com
A searchable database of hundreds of links to educational content. Math resources include interactive movies, slide shows, Java applets and more. Topics include numbers, statistics, geometry, fractions and so on.
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 Charlotte and the World Wide Web  Santrach, Carpenter, Young, Young; The Geometry Center
An introduction to the World Wide Web, its potentials, and links to some geometry software (The Geometer's Sketchpad, Tesselmania, Geometric Golfer, Kali, Kaleidotile), for secondary school educators. A final project created for Math 5337, Technology
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 Charlotte Tutor: Tutoring, Learning, Results  Charlotte Tutor
Test preparation and tutoring in Charlotte, NC and surrounding areas, for a wide array of academic subjects such as mathematics (math), statistics, physics, chemistry, engineering, AP & IB courses and much more. K12 and College (undergraduate & graduate)
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 Charted  Medium
"Beautiful, automatic charts"; just type or paste in the link to a Google Document or other data file in .csv format. Deliberately sparse in features, Charted renders line charts and stacked column charts, refetching data every 30 minutes.
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 ChartsBin  ChartsBin.com
A webbased data visualization tool for making, embedding, and exporting interactive visualizations out of your own data. Register to create your own graphic or browse ChartsBin's public gallery for "Starting Age of Compulsory Education around the World,"
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 ChartTypes
Illustrated compendium of ways to represent data graphically: line charts, contour plots, pictographs, bar charts, area charts, bubble charts, trend charts, Gantt charts, stacked bar charts, scatter charts, candlestick charts, flow charts, cosmographs,
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 Chasing Arrows (MatheMUSEments!)  Ivars Peterson (Math Muse for Kids)
The reycling symbol looks like three bent arrows chasing each other around a triangular loop. You often find it printed on cardboard cartons, envelopes, greeting cards, packages, and trash containers. It's also an intriguing mathematical object. Imagine
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 Chess Math (SMILE)  Louis C. Jackson, Lincoln Elementary School
A lesson designed to reinforce students' knowledge of angles as they become chess
pieces on a floor chess board. From the Patterns and Logic section of a collection of almost 200 single concept lessons by the Science and Mathematics Initiative for Learning
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 Chess'n Math Association / Association Échecs et Maths  Canada's National Scholastic Chess Organization
In Canada, a growing number of elementary schools have incorporated chess into the regular school curriculum, through Challenging Mathematics. This math program is approved by the Ministry of Education and has led to the creation of the Chess'n Math Association
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 Children First: website of the National PTA  National ParentTeacher Association
News and information from the PTA, including its educational programs and materials, conferences, online subscriptions and discussion groups, legislative activities, and links to other childoriented sites.
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 Children's Shareware, Java Applets, Nature Wallpaper, and more  Lawrence Goetz
Shareware programs for kids, for Windows 3.1 and 95, including: Paddle Battle (a pong clone), Larry's Learning Math Machine (unregistered version has addition and subtraction; registered includes multiplication and division practice), Larry's Learning
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 Children's Software Revue
A magazine that features reviews of educational software. The website has a database of children's software that may be searched by title, rating, grade level, copyright date, publisher, platform, or the subject that it teaches. Reviews can be submitted
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 ChiliMATH  Michael Estela
Lessons and tutorials with worked examples, some handwritten: equations, inequalities, radicals, matrices, polynomials, functions, and more.
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 Chinese Mathematics  MacTutor Math History Archives
Articles on mathematics in Chinese culture: An Overview of Chinese Mathematics; Nine Chapters on the Mathematical Art; The Ten Mathematical Classics; Chinese Numerals; and Chinese Problems. Also an alphabetical list of Chinese mathematicians, linked to
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 Chinese Numbers  Erik E. Peterson
Convert arabic numerals up to 1 billion into Chinese numbers, or show the value of a Chinese number (type or paste in a number in Chinese and click "Show English." With, in addition, A Brief Description of the Chinese Number System, and links to related
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 Chinook (champion checkers computer program)  Jonathan Schaeffer, Dept. of Computing Science, Univ. of Alberta
Chinook is the World ManMachine Checkers Champion, a title it earned by competing in human tournaments and defeating the best players in the world.
Chinook is the byproduct of a research effort started in 1989 into gameplaying strategies. The longterm
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 Chips A Tally  Bayonne, NJ Board of Education  5th Grade Teachers
A collaborative math project to determine whether the number of chocolate chips in Chips Ahoy cookies is the same everywhere. Classes may submit data, and results will be posted November 30, 2000. Site includes: lesson plans that use statistics to analyze
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 ChisenBop (or Chisanbop)  Andrew Harris, Computer Science, Indiana & Purdue Universities
An ancient technique from Korea, similar to the abacus or soroban: using your fingers as an analog computer, illustrated and with Real streaming media lessons. Background; simple counting; simple adding and subtracting; adding "around the corner"; subtraction
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 Christianity and the Mathematical Sciences  the Heliocentric Hypothesis  MacTutor Math History Archives
Linked essay on Christianity's influence on the mathematical sciences. With references and other related web sites.
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 Christmas With The Polyiamonds Puzzle Family  Jos H. Hindriks
Polyiamonds share their general principles with Pentominoes, except that their basic 'cell' is the sixtydegree triangle instead of the square. The term 'Polyiamonds', derived from the word 'diamond', was introduced in 1961 by T.H. O'Beirne. Hexiamonds,
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 Chron Me! Online Stopwatch
Easily record time in increments, whenever you have a multipart task to time. Press start; press stop; add a label for that segment; repeat as needed; download the resulting comma or semicolonseparated file to your computer, or open it with Excel.
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 Chronological Age Calculator  AGS Publishing
Click the "Age Calculator" button, then enter two calendar dates to compute elapsed years, months, and days. Available for download.
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 A Chronology of Mathematicians  MacTutor Math History Archives
A chronology of mathematicians between the dates stated, showing how the lives of
the mathematicians overlap: 700 BC700 AD; 7001650; 16251775; 17501850; 18251900; 18751957. Where either the birth or death of a mathematician is unknown (mostly for
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 A chronology of pi  MacTutor Math History Archives
Precomputer calculations of pi, from the Rhind papyrus through Ferguson (1946); computer calculations from Ferguson (1947) through Kanada, Takahashi (Sept 1999). With references and other related web sites.
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 CIESEmath Project  Stevens Institute for Technology Center for Improved Engineering and Science Education
Outlines of ten units of Everyday Math and thirteen chapters of Transition Math, some with links to relevant Java applets and Geometer's Sketchpad sketches. The list of activities links to more interactive math tools, instructions, and handouts. A joint
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 CIESE Online Classroom Projects  Stevens Institute of Technology
Projects that use realtime data available from the Internet, and collaborative projects that use the Internet's potential to reach peers and experts around the world. The site lists currently sponsored projects by level, with an archive of past sponsored
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 Cignition  Cignition, Inc.
Makers of Fog Stone Isle and other immersive online virtual worlds for computational fluency and conceptual understanding of mathematics.
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 Circle Drawing Experiment  Thomas Denney
Draw a figure on the grid by clicking and dragging. Upon release of the mouse button, this JavaScript calculates a "perfect circle" accuracy score by using the sketch's perimeter as the circumference of a perfect circle, and comparing its area to the
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 Circle Formulas (Ask Dr. Math FAQ)  Math Forum
Formulas for finding the area, perimeter, arc, segment, or sector of a circle.
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 Circle Formulas  Math Forum, Ask Dr. Math Common Question
A selection of answers to questions about circle formulas, including how to find their circumferences and areas.
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 Circle Graph  What Percent?  NASA Lewis Learning Technologies Project
This circle graph shows how Jimmy spent his time during the last 24 hours. What percent of time did he spend watching television? A detailed answer is provided. From NASA's 9th Grade Math Proficiency Test.
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 Circles  360 Degrees  Math Forum, Ask Dr. Math Common Question
A selection of answers to questions about why a circle has 360 degrees, and the origin of that degree measurement.
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 Circle Scribe Disk Compass  Bill Harper
A new instrument for manually exploring shape and space, used to draw diagrams on paper, from cartoon characters to limacons, as well as standard geometric constructions. Unlike toys like spirograph, the Circle Scribe Disk Compass requires some geometrical
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 Circles in Geometry  Lesson Ideas: Math: Geometry; Teachnet.Com
Wholeclass and group activities for teaching circle concepts, pi, circumference, etc.
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 Circles of Dissonance  Ivars Peterson (MathTrek)
Much of today's music rests upon ancient tradition going back thousands of years to the time of the Greek mathematician and mystic Pythagoras. The Pythagoreans observed that tones an octave apart are pleasing to the ear. In modern terms,
one can say
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 Circles of Light: The Mathematics of Rainbows  Steven Janke; The Geometry Center
How are rainbows formed? Why do they only occur when the sun is behind the observer? If the sun is low on the horizon, at what angle in the sky should we expect to see a rainbow? This lab helps to answer these and other questions by examining a mathematical
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 Circle Zap  Michael Bulmer
A Java applet that gathers data on your ability to use a mouse rapidly and accurately, with suggested questions for classroom activities.
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 Circumferences, Diameters, and Radii (SMILE)  Dwayne Belle, Fuller School
A lesson designed to teach students to measure circumferences in inches, and compute radii and diameters, given different circumferences. From the Geometry and Measurement section of a collection of almost 200 single concept lessons by the Science and
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 Citizen Maths  Ufi Charitable Trust
Free courses of selfpaced video tutorials, discussions, and handson activities to try out. Developed by Calderdale College (UK), with CogBooks, the Institute of Education, and Oxford Cambridge RSA (OCR).
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 The Civilization of the Mayans  ThinkQuest 1997
Essentially a school paper in web format, covering, briefly, Mayan art, astronomy, ballgame, books and hieroglyphics, class system, and number system, with rated related Mayan links and references, and an abouttheauthors section.
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 CK12
Providers of free, standardsaligned, open content in the STEM subjects. See, in particular, the CK12 Foundation's flexbooks: customizable, free, curriculumaligned K12 math textbooks. In addition to dozens of student editions, some math flexbooks feature
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 ClarisWorks Graphing: Spreadsheet Lessons  Suzanne Alejandre
Stepbystep directions for using ClarisWorks spreadsheets, helpful in exploring the differences between exponential functions and linear functions. Bar graphs, pie charts, pictograms, and other graphs for linear, polynomial, and exponential functions.
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 Clash of the Chess Titans  Keith Devlin (Devlin's Angle)
Thoughts on the KasparovDeep Blue match of 3 May 1997. Throughout history, people have been building machines that can perform tasks better than humans. When Kasparov, referring to his upcoming match, talks about "an area that defines human beings,"
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 Class2Class  Melanie Sprouse
Class2Class is a clearinghouse designed to facilitate student and class participation in Internet projects, including collaborative projects, datacollecting experiments, peer tutoring, and keypal exchanges designed to enhance the mathematics in your
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 Classic Fallacies  Philip Spencer; University of Toronto Mathematics Network
Mathematical "proofs" demonstrating, among other things, that 1 = 2 and that all people in Canada are the same age. Each consists of several steps, and users search for the flaws. For every step there is explanation of why the flaw is or is not in that
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 Classic Problems  Math Forum; Ask Dr. Math FAQ
Classic problems from the Ask Dr. Math FAQ (Frequently Asked Questions) files, including: age word problems, birthday probability, boy or girl?, camel and bananas, coin problems, doubling pennies, grazing animals, liars and truthtellers, the missing dollar,
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 Classification of Patterns  BrownHerbst, Donnelly, Stratton, AndersonNielsen; The Geometry Center
Materials about symmetry and classification of repeating patterns for students in grades 710 using wallpaper patterns, to be used as either an introduction or a review: a classroomready source of information. A final project created for Math 5337, Technology
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 Classroom Compass  Adams, Powell, Assoc. Editors; Southwest Educational Development Laboratory
A magazine published from 1994 to 2005, with ideas, activities, and resources for teachers interested in improving instruction in science and mathematics, and links to simple classroom activities with ideas about learning and instruction. Each issue presents
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 Classroom Projects  TEAMS Distance Learning, Los Angeles County Office of Education (LACOE)
A site for teachers looking for a content area project or contest for the classroom. Join a TEAMS project or browse a list of projects and contests sponsored by other organizations. Extensive list of upcoming, current, ongoing, and completed projects
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