 Continued Fractions  David P. Stern
A short elementary exposition of continued fractions, without proofs. Students usually know that any number (e.g. pi) can be approximated to any desired accuracy by decimal fractions, but this method does the same using ordinary fractions. Examples include
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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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 Continued Fractions With A Calculator (SMILE)  Fred J. Schaal, Lane Tech High School
A lesson designed to teach students how to evaluate continued fractions by taking many reciprocals with a calculator. From the Arithmetic section of a collection of almost 200 single concept lessons by the Science and Mathematics Initiative for Learning
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 Continuing Studies and Corporate Education  University of Massachusetts Lowell
The UMass Dartmouth and UMass Lowell Divisions of Continuing Education offer a selection of standard, fullcredit university courses offered over the web. Students and faculty use the World Wide Web, email, chat and other Internet resources to review
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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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 Continuous Nowhere Differentiable Function  Michal Wojcik
A proof of the existence of a continuous function f:[0,1]>[0,1] that is nowhere differentiable. This proof uses the Banach Contraction Principle.
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 Contour plots with trigonometric functions  Eric Weeks
A method of making interesting nonmoiré patterns. See also his pages on Lissajou figures, Polar Flowers, and Spiral triangles.
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 Contradancing and Matrices  Ivars Peterson (MathLand)
Bernie Scanlon, a mathematics instructor at Bakersfield College in California, has been dancing nearly every weekend since 1990, even traveling to distant parts of the country to join in the fun. His passion is contradancing  a dance form unknown to
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 Contributions of 20th Century Women to Physics  Nina Byers; Department of Physics & Astronomy, University of California at Los Angeles
A searchable archive of data on 86 twentieth century women who have made original and important contributions to physics, including to the field of mathematical physics. Graphics include an annotated photo gallery and a poster montage of famous females
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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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 Convergence  Mathematical Association of America (MAA)
An online magazine encouraging the use of mathematics history as a learning and teaching tool. Convergence will include: math history articles that have a special pedagogical or learning appeal; sharing of classroom experiences; animated mathematical
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 Conversation about A Beautiful Mind, with Sylvia Nasar and Dave Bayer  archived by the Commonwealth Club of California
A conversation with Sylvia Nasar (biographer of John Nash) and
Dave Bayer (math consultant on A Beautiful Mind). Streaming audio
of event sponsored by MSRI that took place May 2002.
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 Conversion Factors  Washington State Department of Transportation
Conversion tables between U.S. customary units and SI (International System) units. The proper conversion procedure is to multiply the specified value on the left (primarily U.S. customary values) by the conversion factor exactly as given below and then
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 Conversion Page  Keith Hooker
Convert to and from U.S. fluid/dry and metric measures: quarts, cups, teaspoons, gallons, fluid ounces, tablespoons, liters, milliliters; pounds, ounces, grams, kilograms.
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 Conversion Program  Lawrence Goetz
A page that uses JavaScript to convert temperature between Fahrenheit and Celsius, length among inches, centimeters, feet, yards, meters, miles, and kilometers; weight among grams, ounces, pounds, and kilograms; and volume among fluid ounces, cups, pints,
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 ConvertAuto.com  Lilly Hammond
JavaScript calclulators for instant online conversions: angles; area; cooking, such as teaspoons (tsp) and quarts (qts); foreign currencies; density; energy; force; frequency; fuel economy, such as miles per gallon (mpg); length; power; pressure; speed;
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 The Converter Site  Alastair Hazell
A user friendly metric and imperial converter tool. Converts length, area,
weight, speed, temperature, time, energy, force, length, mass, power and
currency.
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 Converting Celsius To Fahrenheit (SMILE)  Amaechi Onyeali, Carter Elementary School
A lesson designed to teach students to solve multiplestep equations involving addition, multiplication, and division; convert a known temperature in celsius to an equal temperature in fahrenheit; and accurately read a thermometer in degrees celsius.
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 Converting Fractions to, from Decimals  Math Forum, Ask Dr. Math Common Question
A selection of answers to questions about converting fractions to decimals and back, including how to convert repeating decimals to fractions.
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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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 Convert It!  Micro Images Internet Services
Conversion tables: enter a number and convert from one unit to another: acceleration, area, energy/work, power, length, mass, metrology, pressure, temperature, volume, U.S. fluid/liquid, and velocity conversions are all possible.
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 Convertme.com  Mariya Voznesenskaya and Sergey Gershtein
Online converter of areas, capacities and volumes, circular measures, computer storage, currencies, distances and lengths, energy and work, fuel consumption, power, pressure, speed, temperatures, time, torque, weights and masses. Convertme.com offers
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 Convex and Discrete Geometry  Dave Rusin; The Mathematical Atlas
Information on convex and discrete geometry. Applications and related fields and subfields; textbooks, reference works, and tutorials; software and tables; other web sites with this focus.
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 Convex Hull Algorithms  Tim Lambert
An applet that demonstrates some algorithms for computing the convex hull of points in three dimensions. See the points from different viewpoints; see how the Incremental algorithm constructs the hull, face by face; while it's playing, look at it from
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 Cool Cosmos  Education and Public Outreach Group, Infrared Processing and Analysis Center and the SIRTF Science Center
To communicate the world of infrared astronomy to the public, the Cool Cosmos web site offers: classroom activities; infrared light lessons; infrared astronomy tutorial and timeline; multiwavelength astronomy; Ask an Astronomer; Cosmic Kids; image galleries,
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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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 Cool Math Guy  Dana Mosely
Watch math lessons delivered by a video instructor for several textbook publishers. Topics range from arithmetic to several variable calculus, and include review for the standardized tests such as the SAT and ACT. Also, play games that involve matching,
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 Cool Math Lessons  Ken Abbott
A blog of "simple ways to teach and think about mathematics." Posts, which date back to April, 2010, have covered zero, prime decomposition, fractions, functions, and creating mathematics.
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 Cool Math Sites  Nina Heal
A links list in the following categories: puzzles, algebra, geometry, calculus, discrete math, statistics and probability, trigonometry and precalculus, books and reference, calculators and other technology, data, history, other links sites and internetbased
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 COOL School  School districts of British Columbia, Canada
COOL School is a consortium of school districts in BC, Canada, which work together to develop quality online learning resources. An LOR (learning object repository) is available on site which includes a variety of math topics, from applications to Calculus.
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 Cool School Tools  Tim Fahlberg
Shockwave whiteboard movies on algebra, geometry, probability, statistics, the mathematics of finance, and more. A whiteboard movie (WM) is a multimedia screen recording of writing on an electronic whiteboard (real or virtual) with or without voice and/or
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 Coop City  Peter Barricelli
A classroom project involving the construction of scale models of buildings and towns. In addition to teaching ratio and proportion, the process introduces the students to blueprint and CAD (Computer Aided Design) programs.
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 Cooperative Learning  Classroom Compass
The fall 1994 issue of Classroom Compass looks at some aspects of cooperative learning and ways it can be implemented in the classroom. Two instructional activities, one providing suggestions for elementary students (Pumpkin Exploration) and one for higher
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 Cooperative Two Person Generalized (NonZero) Sum Game  Elmer G. Wiens; Egwald Web Services Ltd.
This article uses John Nash's theory to solve the "Battle of the Sexes" twoperson cooperative (bargaining) game. It discusses such key concepts as the negotiation set, threat strategies, the Nash function, the negotiated settlement, and the payoff tradeoff
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 Coordinates and similar figures  Mark Motyka, Math League Multimedia
Definitions and illustrations: What is a coordinate?; Similar figures; Congruent figures; Rotation; Reflection; Folding; Symmetric figure.
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 Coping With Math Anxiety  B. Sidney Smith, Wendy Hageman Smith; Math Academy Online/Platonic Realms
A "minitext" concerning the potentially disabling fear of math. This site defines math anxiety, discusses its social and educational roots, addresses some widespread myths about math and learning math, and deals with possible strategies for overcoming
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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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 Copyu  Equation and Data Plotting  October Pen Educational Software
Coypu is an equation and data plotter designed to encourage exploration of data and to develop interpretation skills. Coypu plots Cartesian, polar and parametric equations; produces scattergrams and simple line graphs from data files; allows combinations
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 Core Concept: Comprehensive Assessment  Edutopia
The George Lucas Educational Foundation's compilation of resources on assessment in education, including videos, reallife examples, blog posts, articles, and interviews.
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 CorePlus Mathematics Project (CPMP)
A fiveyear project funded by the National Science Foundation to develop student and teacher materials for a complete threeyear high school mathematics curriculum for all students, plus a fourthyear course continuing the preparation of students for
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 Corner for Interactive Geometry Software (CIGS)  The Math Forum
The main Math Forum page for resources devoted to the support of teaching with geometry software, especially dynamic, interactive software such as Cabri Geometry and the Geometer's Sketchpad. Instructional activities and lessons to read on the Web or
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 Cosmeo  Discovery Education, Inc.
Homework help from the Discovery Channel. Browse math help by topic to watch math Flash videos (many with closed captioning), read articles, play "brain games," and more. Walk through your math problem with WebMath. Cosmeo's video library has more than
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 CostOfLiving Calculator, Percent Change Calculator  NewsEngin Inc.
The cost of living utility converts dollar values, adjusting for inflation. Find the buying power of dollar amounts dating back to 1957, according to a national U.S. city average, urban regions, or metropolitan areas, as based on the historical Consumer
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 Cotton Expressions Science and Math TShirts  Cotton Expressions, Ltd.
Science and mathematical tshirts currently sold to museums and college bookstores worldwide.
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 Council of Presidential Awardees in Mathematics (CPAM)
An organization whose members are recipients of the Presidential Award for Excellence in Mathematics Teaching, a program established in 1983 by The White House and sponsored by the National Science Foundation (NSF) to identify outstanding science and
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 Countdown  Dr. Diane Schiller, School of Education at Loyola University
This site contains over 500 online math videos that cover a wide range of math topics. Many videos have accompanying printable activity sheets. The movies are organized by standard math categories on the homepage and alphabetically in the index. There's
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 Countdown!  Objective Consulting Inc. (OCI)
Calculate the number of seconds between any two events: find out how long it will be until the millennium, until your birthday, or simply how long you have been alive. Answers are also expressed in days, hours, and minutes.
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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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