 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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 Cubes of Perfection  Ivars Peterson (MathTrek)
...Six is the smallest perfect number. Twentyeight comes next. Its proper divisors are 1, 2, 4, 7, and 14, and the sum of those divisors is 28. Incidentally, if the sum works out to be less than the number itself, the number is said to be defective
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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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 Cubic and Quartic Equations  Math Forum, Ask Dr. Math FAQ
General solutions to cubic and quartic polynomial equations.
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 Cubic surfaces  MacTutor Math History Archives
Linked essay on the history of surfaces of order three.
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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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 Cuisenaire Rods and Math (SMILE)  Linda Easter, Dewitt Clinton Elementary School
A lesson designed to familiarize students with the history, development and philosophy of Cuisenaire Rods; to teach them to find the least common multiple of several given numbers using Cuisenaire rods; and to reinforce previously taught math skills by
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 CULAtools: GPUAccelerated Linear Algebra Library  EM Photonics, Inc.
CULA is a GPUaccelerated implementation of the LAPACK numerical linear algebra library, containing several of the most popular LAPACK functions, using NVIDIA’s CUDA™ architecture. CULA Basic is free and available for download; academic licenses of CULA
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 Culturally Situated Design Tools: Teaching Math through Culture  Ron Eglash
Java for creating your own Mangbetu design, cornrow curves, graffiti, bead looms, SimShoBan, Yupik star navigator, Yupik parka patterns, PreColumbian pyramids, and rhythm wheels  and learning the mathematics behind them. Organized into African, African
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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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 Curmudgeon
Blog by a veteran math teacher in Vermont who "believes that math should be taught, not collaboratively explored; algebra and geometry are better than a vague course of Integrated Math; spiraling doesn't work nearly as well as learning it properly the
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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 Development via Literary and Musical Forms  Joel K. Haack, Dept. of Mathematics, Univ. of Northern Iowa; the Math Forum
An article presented at the Humanistic Math session of the Joint Mathematics Meetings, January 1013, 1996, in Orlando, Florida. Haack's article discusses how the literary and musical forms can help develop a path through mathematical knowledge, envisioning
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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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 Curriculum IT Support (CITS)  Department for Education and Employment, UK
Materials, publications, and activities encouraging the use of information technology in secondary schools (1118 years). Information includes: a database about the use of IT in mathematics lessons in secondary schools; a booklet describing how some departments
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 Curriculum  Math  Schoolinfosystem.org
"Curated education information" about mathematics curriculum. Posts reproduced from newspapers and other sources, which date back to April, 2004, have included "Math Teachers Speak Up"; "The Last Time You Used Algebra Was ..."; "Askey on Elementary Math
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 Curriculum Pathways  SAS inSchool
Internetbased product that connects teachers to a broad range of curriculum resources and clarifies ways to use those resources in the classroom. Find lesson plans and links to Web sites in math, science, English, and social studies; access national
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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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 Curve Family Index (Visual Dictionary of Special Plane Curves)  Xah Lee
A discussion of the many ways to classify curves, how they are named, a curve family tree, and interconnection between curves, with related Web sites about fractals and curves. Hosted by the Math Forum.
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 Curve Fit XYZ Computer Program  William L. Meyer Jr.
Windows software in C developed to curve fit data for algorithm definition. See also Spline Curve Fit 3D for complex threedimensional surfaces.
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 Curves and Lying Calculators  Ivars Peterson (MathLand)
The pictures generated by a graphing calculator depend on the number of pixels in the display. The TI85 has 63 rows and 127 columns in its display (a total of 8,001 pixels). "This configuration of pixels defines what we actually see and, therefore, sometimes
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 Curves  Igor Gerasimov
This scientific animated screensaver draws the Archimedean spiral, cardioid, cycloid, cissoid of Diocles, folium of Descartes, deltoid, lituus, logarithmic spiral, nephroid, limacon of Pascal, semicubic parabola, strophoid, sinusoid, epicycloid, hypocycloid,
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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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 Curving Beyond Fermat  Ivars Peterson (MathTrek)
"When Andrew Wiles of Princeton University proved Fermat's last theorem several years ago, he took advantage of recently discovered links between Pierre de Fermat's centuriesold conjecture concerning whole numbers and the theory of socalled elliptic
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 Curvus Pro X  Jean Bovet, Simon Bovet, Arizona Software
Curvus Pro X is a powerful and userfriendly equation graphing software designed for Mac OS X. It has been designed specifically to handle complex mathematical expressions and plot them in a few clicks. 2D and 3D functions can be entered using its intuitive
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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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 The Cutting Sticks Problem  Frans Faase
A classic math puzzle: You are given k sticks with integer length of which the total length of sums up to n(n+1)/2. None of the sticks is shorter than n. Can you always cut them into sticks with length 1, 2, up to n, no matter the number of the sticks
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 CV Complex Variables (Front for the Mathematics ArXiv)  Univ. of California, Davis
Complex Variable preprints, from the U.C. Davis front end for the xxx.lanl.gov ePrint 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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 CYBERCHASE Online  Educational Broadcasting Corporation (PBS.org)
Companion site to CYBERCHASE, PBS's animated math adventure series, intended to foster math literacy and problemsolving skills for kids ages 811. Play interactive games or practice with tools such as the talking calculator, crack challenging puzzles,
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 CyberExam (S.O.S. Mathematics)  Dept. of Mathematical Sciences, Univ. of Texas at El Paso
A place for students and educators to check out sample tests, midterm exams, final exams, quizzes, projects, etc... in Mathematics. To submit an exam, please fax or email your material to S.O.S. MATHematics. (If you are a student,
please ask your instructor
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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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 Cybermath  Gustav Taxén, Ambjörn Naeve, Olle Sundblad, Pär Bäckström and Sören Lenman
An avatarbased collaborative virtual exploratory environment for math. Trial version for Windows is available free.
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 Cybernetics and Systems Theory  F. Heylighen; Principia Cybernetica Web
General background material on the field of Cybernetics and Systems Science (also: (General) Systems Theory or Systems Research), an academic domain that touches virtually all traditional disciplines, from mathematics, technology, and biology to philosophy
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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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 CyberStat  Rick Thomas
An introductory statistics course for high school students who would like to get a background in basic statistical concepts and learn to apply them in a variety of curricular and vocational fields. The course will also prepare you to take the new AP Statistics
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 CyberStats  CyberGnostics, Inc.
A complete online introductory statistics course, including: a focus on data analysis and conceptual understanding rather than computation; over 600 interactive applets; real data in realworld settings; a builtin, simple, and free course management
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