 Center for the Development of Teaching (CDT)  Education Development Center, Inc. (EDC)
A research and development center whose goal is to learn how teachers' practice can be transformed to support students' construction of knowledge. Currently focusing on mathematics and science teaching, the Center carries out research and action projects
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 Center of Excellence for Science and Mathematics Education (CESME)  University of Tennessee, Martin, Tennessee
A site designed to serve as a starting point for teachers who are looking for resources to improve their science or mathematics teaching. CESME Resources and Projects include Mathematics Activities Guides (PDF format) and the Tennessee Mathematics K8
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 Centre for Innovation in Mathematics Teaching  University of Plymouth
A focus for research and curriculum development in mathematics teaching and learning with the unifying aim of enhancing mathematical progress in schools and colleges. The site includes: The Mathematics Enhancement Programme; Resources: worksheets in HTML
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 CEO Forum on Education & Technology
By regularly highlighting the importance of education technology and monitoring its deployment in the schools, CEOs seek to accelerate the country's progress in preparing our children for the next century. The site contains a description and overview
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 Challenge by Choice  David Suarez and others
A classroom mathematics program that lets students choose their own level of challenge within the structure of the curriculum. His blog offers details of the program, the theoretical and practical basis of differentiated instruction, and the results he's
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 The Challenge of Detracking: Finding the Balance between Excellence and Equity  Lockwood, Cleveland; UEWeb
Download this PDF for an introduction to and background of tracking; terminology, issues, and data showing prevalence and impact; and bibliography.
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 Change the Equation
This nonprofit, nonpartisan CEOled initiative aims to "solve America's innovation problem. It answers the call of President Obama's Educate to Innovate Campaign to move the U.S. to the top of the pack in science and math education," with science, technology,
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 Changing the Way We Teach Math  Kate Nonesuch
This document is a manual for teaching basic math to adults. It sets out some "best practices" from the literature, then outlines some difficulties instructors may face in implementing them, and makes suggestions for overcoming those difficulties. There
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 The Chaos Metalink  Industrial Street Productions
A site designed as an ongoing resource for all those interested in Chaos science and things fractal. This site is sponsored by Images of Chaos, an Artwork for Television and Industrial Street Productions as a service to the Chaos community. Featured Sites;
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 Characteristics of Gifted Children: Articles and Research  Carolyn K., Hoagies' Gifted Education Page
Articles and reports on characteristics of gifted children: perfectionism, sensitivity, social skills and emotional skills, underachievement, and visualspatial learning.
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 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 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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 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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 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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 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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 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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 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 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 in Geometry  Lesson Ideas: Math: Geometry; Teachnet.Com
Wholeclass and group activities for teaching circle concepts, pi, circumference, etc.
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 Circular Reasoning  TJ Leone, Leone Learning Systems, Inc.
A free, Javabased software tool for thinking about circles, sectors, segments, and angles. Based on Montessori principles of learning through the manipulation of objects. Activity cards included. For Windows computers only. Includes ideas and stories
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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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 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 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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 ClassK12.com  LogTera
Online adaptive math apps designed for distributed practice. Aligned to the Common Core State Standards (CCSS), ClassK12's K5 gamebased interactive environment and visual models reward students with points and badges. Freely access worksheets and practice
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 Classroom Books and Libraries: Math  Attanasio & Associates, Inc.
The mathematics selection from this vendor of classroom libraries and books, which include Big Al and Shrimpy, It's about Time, My Very First Book of Shapes, The Shapes We Eat, How High Can a Dinosaur Count?, Everyone Uses Math, Pigs on a Blanket, Underwater
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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 Conversation (Learning and Mathematics)  Nicholls, Hazzard; Math Forum
In their 1993 book Education as Adventure, John Nicholls and Susan Hazzard explore students' understandings of the nature and point of school learning and the idea that students are valuable critics of the classroom curriculum and their own learning.
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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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 ClassZone  McDougal Littell, Publishers
In ClassZone, McDougal Littell has gathered together all of its activities, interactive online resources, research links, chapter quizzes, and other materials that support its popular middle and high school mathematics textbooks, such as Integrated Math
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 Climate Classroom  One Million Acts of Green
This curriculum encourages students to analyze the science of global warming and its relevance to current events and their daily lives, through classroom activities, lesson plans, and family and community activities. The One Million Acts of Green Program
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 CLN: Community Learning Network
Designed to help K12 teachers integrate technology into their classrooms. Includes over 225 menu pages with more than 4,200 annotated links to educational WWW sites, as well as over 100 WWW resources of their own.
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 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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 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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 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 coinflipping experiments. Includes access to data on past coin flipping and an article about coin flipping.
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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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 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 email 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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 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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 Colm Mulcahy
Blog by a recipient of the Mathematical Association of America's Allendoerfer Award for excellence in expository writing. Posts, which date back to October, 2012, have included "Weak Math? Try Math Week!" and "Oranges and Apples Comparisons: The Roots
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