 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 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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 Computers, Free Will, and Marching Ants (Math Chat)  Frank Morgan; Christian Science Monitor
Is it logically possible for a computer to have free will?
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 Conceptual Learning Materials  Conceptual Learning Materials, Inc.
Support materials intended to reinforce basic math concepts. Materials for teachers as well as students.
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 Connected Curriculum Project (CCP)  Moore, Smith; Duke University
The Duke component of a coordinated effort to create interactive learning environments for a wide range of mathematics and mathematically based applications, combining the flexibility and connectivity of the Web with the power of computer algebra systems.
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 Connected Mathematics Project Sketchpad Activities  Nathalie Sinclair, Michigan State University
Worksheets, sketches, and teacher notes for the Connected Mathematics Project curriculum (CMP). Developed by researchers from Michigan State University and KCP Technologies, who have surveyed Years 6 and 7 of CMP. Use the link at the bottom of the page
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 Connecting Geometry  Cathleen V. Sanders
A fully credited high school distance learning geometry course offered via the Internet to students throughout the Hawaiian islands as part of a grantfunded pilot project through the Hawaii Department of Education. During this ESchool (electronic school)
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 Continental Mathematics League (CML)
Information about the Continental Math League, including samples and solutions from CMLs for grades two and three, Pythagorean for grades 49, Euclidean for grades 49, and calculus. Also, order Best of CML books containing questions, and obtain the competition's
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 Continued Fractions, Infinite Continued Fractions, and Iteration  Don Cohen, The Mathman
Ten different ways to solve a quadratic equation  an area of mathematics with applications to population increase, finding the square root of a number, chaos theory, and fractals. Sample problems from Chapter 8 (Solving Equations and Iteration) of Don
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 Continuous Everywhere but Differentiable Nowhere  Sameer Shah
Blog by a high school math teacher in Brooklyn (NY), beginning shortly before teacher training and orientation, upon realizing that the textbook "completely limits me as a teacher and as a creative person" and who subsequently sets out to "design clear,
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 Conundrum Corner  UselessKnowledge.com
Math puzzles to solve, get the answers to, or send to friends. Also, Visual puzzles, Thinking puzzles, and other conundra.
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 Converting Inches to Miles  NASA Lewis Learning Technologies Project
The scale on a road map is 1 inch = 250 miles, how many inches would represent 1250 miles? A detailed answer is provided. From NASA's 9th Grade Math Proficiency Test.
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 Converting Tons to Pounds  NASA Lewis Learning Technologies Project
A loaded moving van weighs 5 tons. How many pounds would 10 loaded moving vans weigh? A detailed answer is provided. From NASA's 9th Grade Math Proficiency Test.
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 coolmath.com: Cool Math  Karen
A searchable "amusement park of mathematics" for exploring math: functions, tessellations, polyhedra, limits, logs, fractals (with galleries), puzzles and problems, fun with numbers, how to succeed in math, careers in math. Also Cool Links for Math for
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 Cool Math Dudes  ThinkQuest 1996
Problems to explore, with solutions: Investment Inquiry; Circle Selections; The Beginning of Breanna; Matrices Mayhem; Breanna Returns.... With a Watch; Roots of Algebra; Breanna's Chess Companions; Squares of All Shapes and Sizes (well, not of all shapes);
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 CopyCat  Jim Morey
A Java game that revolves around replicating a picture created by several patterned faces of a solid object (like a cube), challenging the mind to understand complex geometrical structures and symmetry. To do well at the game, the player must first become
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 Count Down to Fall  Fran Hawk, Sherry Neidigh (ill.)
Seasonal counting fun with this picture book. This title also includes the Sylvan Dell “For Creative Minds” section with lessons like “Plant Parts,” “The Shape of It All,” and “Match the Leaves.” Check out all these activities at the book homepage, along
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 The Counterfeit Coin  Ivars Peterson (MathTrek)
The classic puzzle of the counterfeit coin has long served as a stiff test of one's reasoning power and ingenuity. In its standard form, the problem concerns 12 coins identical in size, shape, and appearance. One coin, however, is counterfeit, having
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 The Counting Game  Chris Malumphy
A game for children starting to count, showing a number of objects and asking you to click on the correct number button. A thermometer graphic tells you when you have correctly answered ten questions.
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