 CATS: Combinatorial Algorithms Test Sets  ACM Journal of Experimental Algorithmics (JEA)
Mission: to facilitate experimental research by standardizing common benchmarks, providing a mechanism for their evolution, making them easily accessible and usable, and identifying significant open questions in the design of good test sets and the assessment
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 Cattle of the Sun  Ivars Peterson (MathTrek)
The story goes that Archimedes of Syracuse (287212 B.C.) was annoyed with Apollonius of Perga (262190 B.C.), who had criticized Archimedes' work on the multiplication of large numbers. For revenge, Archimedes devised a fiendish computational problem
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 CAUSEweb  Dennis K. Pearl, Director
The Consortium for the Advancement of Undergraduate Statistics Education (CAUSE) collects, reviews, develops, and disseminates resources for members of the undergraduate statistics education community. Resources include lesson modules for lecturers; computer
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 cavmaths  Stephen Cavadino
Blog by a maths teacher and KS5 coordinator. Posts, which date back to July, 2012, often incorporate social media and snapshots of scratch work: "Christmaths Projects," "Engaging with Written Feedback," "Consistency, Humour, Well planned Lessons and
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 Census Challenges (Math Chat)  Frank Morgan; Christian Science Monitor
Gordon Squire notes that planners for the 2000 U.S. Census wonder what to do about missing certain groups of people such as many homeless in New York. Suggestions include statistical random sampling. What approach would you suggest?
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 Center for Mathematical Talent  New York University
The Center for Mathematical Talent (CMT) at the Courant Institute of Mathematical Sciences coordinates activities for students in the New York City area who would like more mathematics than is included in the usual mathematics classroom. Freely downloadable
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 Centre for Education in Mathematics and Computing (CEMC)  Faculty of Mathematics, University of Waterloo, Canada
Home of the Canadian Mathematics Competitions (CMC); the Canadian Computing Competition; and contests for middle and high school students. Download PDFs of contest problems dating back to 1997. Register, obtain results from the competitions, participate
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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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 The Cereal Box Problem: A Lesson in Expected Value (MSTE)  George Reese; University of Illinois at UrbanaChampaign (UIUC)
Collect all six! How many cereal boxes would you expect to have to buy to get all the prizes? This lesson examines this expected value question and includes an online simulation.
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 Challenges: Mathematics and Statistics  InnoCentive, Inc.
"Seekers" submit challenges to InnoCentive's online marketplace for innovation, where scientists, engineers, professionals and entrepreneurs collaborate to solve them. The most innovative solutions receive financial awards ranging up to US$1,000,000.
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 Challenges  RSA Security
Read about three cryptographic challenges: RSA Factoring Challenge, SecretKey Challenge, and DES Challenge III. For the solution of these cryptographic challenges, RSA offers cash prizes as "... modest rewards for some of the hard work that goes into
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 Chance Encounters at ICME9  Cut the Knot!, Alexander Bogomolny
From the International International Congress on Mathematics Education held in Tokyo in August, 2000, impressions that came from personal, often unplanned, meetings with such mathematicians as N. P. Dolbilin (who outlined the history and the current state
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 The Chaos Game  Robert L. Devaney; Dept. of Mathematics, Boston University
One of the most interesting fractals arises from what Michael Barnsley has dubbed "The Chaos Game," which is played as follows. First pick three points at the vertices of a triangle. Color one of the vertices red, the second blue, and the third green.
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 Chaotic Dynamical Systems (Serendip)  Victor J. Donnay; Bryn Mawr College
In dynamical systems, an object moves according to a rule. Depending on the rule motion, the object may move in a regular fashion or in a chaotic fashion. This project by Prof. Donnay, his students, and colleagues illustrates the ideas of chaos theory
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 Chase Four Sketches  Bill Finzer, Key Curriculum Press
A sketch and a script to answer the question: if there are four ants in the plane and each crawls continuously toward the next ant, what do their paths look like?
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 cheesemonkey wonders  Elizabeth Statmore
Blog by a San Francisco high school teacher who came to the classroom by way of "many years as an entrepreneur and executive in Silicon Valley." Statmore left industry after seeing "too many good, smart people who were missing out on wonderful career
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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'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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 ChiliMATH  Michael Estela
Lessons and tutorials with worked examples, some handwritten: equations, inequalities, radicals, matrices, polynomials, functions, and more.
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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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 Chronology of Recreational Mathematics  Mario Velucchi
David Singmaster's list of events from circa 2700BC to 1993, with references, includes how in Greek mythology, Palamedes was the inventor of dice; in 1392, three packs of cards were made for Charles VI of France; in 1605, Cervantes' Don Quixote gives
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 Cipher Challenge  University of Southampton
A cipher challenge for cryptographers under the age of 19. With solutions and comments about the breaking of sets of encoded messages, or ciphertexts, of increasing difficulties.
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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  Diameter, Circumference, Radius and the Discovery of Pi (SMILE)  Kathleen Ryan, Randolph Magnet School
A 7th grade lesson designed to help students identify and measure the diameter, circumference, and radius of a circle. The students discover the approximate value of pi through the relation between the diameter and circumference. From the Geometry and
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 Classical and Quantum Chaos, A Cyclist Treatise  Predrag Cvitanovic'
An online textbook on chaotic systems and dynamics, including exercises, solutions, and a guide to related literature. Read the book online in hyperlinked PDF format, or download it as a gzipped PostScript file. By the CATS cyclist team: Cvitanovic',
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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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 Clay Mathematics Institute  Clay Mathematics Institute
The primary objectives and purposes of Clay Mathematics Institute (CMI) are to increase and disseminate mathematical knowledge, to educate mathematicians and other scientists about new discoveries in the field of mathematics, to encourage gifted students
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 Cálculo para la Ingeniería  Salvador Vera Ballesteros
Temas, Problemas, Exámenes, Enlaces.
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 Cleave Books
Teacher Resources on Line (TRoL) include downloadable grid paper; Ttiles; dictionary exercises; shapes Bingo; MisMaths, an annotated collection of innumeracy and other math mistakes in news headlines; fact sheets; tables; formulas; a mathematical vocabulary
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 Clickmazes  Gilbert, Mitchell
An extensive collection of interactive puzzles and mazes organized in the following categories: Maze gallery; Attic gallery; Maze of Life; HexaRoll; Oskar's fourbit mazes; 2D tilt mazes; Colourzone mazes; 3D tilt mazes; Tilt puzzles; NEWS and RULES;
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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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 Colección de Juegos de Ingenio del Club Mensa  Javier García Algarra
Esta colección recoge juegos de ingenio y problemas de matemática recreativa publicados en diversas revistas de Mensa, la asociación internacional para personas con un elevado cociente intelectual. En cada problema se hace referencia
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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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 CollegeCram.com  The Smartacus Corporation
Feebased 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 Math Prep for High School Students  C. J. Kentler and V. S. Manoranjan, Washington State University
Selfscoring problems, new with every click, to gauge a student's preparedness for college level math: operations, solving for a variable, solving linear equations, word problems, solving absolute value equations, solving inequalities, distance between
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 College Physics for Students of Biology and Chemistry  Kenneth R. Koehler
A hypertextbook written for firstyear undergraduate physics students, emphasizing human physiology and how the physics of the system affects its chemical and biological behavior. Nine chapters, with problems, cover mechanics, fluids, electricity, magnetism,
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 Colorful Mathematics  Claude Laflamme
An educational software series presenting advanced mathematical concepts to K12 students in a gameoriented approach. The five games offered use simple coloring and/or drawing techniques to illustrate mathematical concepts from graph theory. Downloadable
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 Columbus State University Math Contest  David Rock and Doug Brumbaugh, College of Education, Columbus State University
Problem of the Week, Algebra in Action, Middle School Madness and Elementary Brain Teaser  all available in "challenge" mode. Past problems are archived, with solutions available upon request.
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 Combinatorial Object Server (COS)  Frank Ruskey; Dept. of Computer Science, Univ. of Victoria, B.C., Canada
Specify a type of combinatorial object, together with specific parameter values, and COS will return to you a list of 200 such objects. Generation pages: permutations, combinations, various types of trees, unlabelled graphs, linear extensions of posets,
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 The Combinatorics Net and Annals Of Combinatorics  Bill Chen
Links to combinatorics articles, groups, conference reports, seminars, journals, books, typesetting and graph drawing, software, preprints, open problems, research announcements, news and stories, and related sites. The Annals of Combinatorics publishes
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 Common Core Algebra II Statistics and Probability  Maryland Public Television
Modules of lessons enlivened by computer animations, journal prompts, interactive "check your understanding" selfassessments, and more: linear, quadratic and exponential regression; regression; standard deviation; inferences; probabilities of compound
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 Common Core Math  New Jersey Center for Teaching & Learning
Freely downloadable teacherdesigned units consisting of one to two hundred Interactive White Board (IWB) presentation slides: each of grades K8, PreAlgebra (available in Spanish), Algebra I (available in Spanish) and II, Geometry, PreCalculus, AP
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 Common Mistakes in College Mathematics  Eric Schechter
Pointers for students about mistakes in general mathematics and calculus. Errors include: everything is additive, loss of invisible parentheses, incorrect writing of fractions, derivative of x to the x, unbalanced differentials, and naive answers for
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 The Community of Ordinary Differential Equations Educators  Yong, Darryl; and Borrelli, Robert, Principal Investigators
The Community of Ordinary Differential Equations Educators (CODEE) seeks to improve the teaching and learning of ordinary differential equations (ODEs) through modeling, computer experiments, and other active learning projects. Freely download expository
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 Complex, Technology Based Problems in Calculus  Math Department, RoseHulman Institute of Technology
Nearly 100 problems with a higher level of complexity than traditional textbook problems and that foster use of a computer algebra system. Problem categories include: antidifferentiation, data fitting, difference equations, differential equations, and
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 Complex Variables (S.O.S. Mathematics)  Dept. of Mathematical Sciences, Univ. of Texas at El Paso
An online course: learning units presented in worksheet format review the most important results, techniques and formulas in college and precollege complex variables. Complex Numbers: Basic Definitions and Arithmetic, The Complex Plane, The Polar Form
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 Compound Interest to e and i  Don Cohen (The Mathman)
Graphing and exploring simple interest and compound interest. Examples of interest earned on one dollar at 6 percent compounded daily, monthly, quarterly, annually. Patterns, infinite sequence. Sample problems with some answers from Chapter 11 of Don
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 Computational Geometry  Joseph O'Rourke
Computational Geometry is concerned with designing algorithms and computer programs to perform geometric computations. A need for such computations arises in many fields: computer graphics, robotics, pattern recognition, geography, manufacturing, etc.
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