 Contrasting Cases  Star, Jon R.; RittleJohnson, Bethany; and Newton, Kristie J.
Evaluating the value of students explaining contrasting examples. With funding from the Institute for Education Sciences and the National Science Foundation (NSF), this project compared learning from contrasting examples to learning from sequentially
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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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 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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 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 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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 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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 Corbettmaths  John Corbett
Hundreds of videos, "5aday" and other worksheets, practice papers, practice questions, revision cards, conundrums, quizzes, and more by a Somerset (U.K.) mathematics teacher.
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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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 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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 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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 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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 Counting by Twos  Ivars Peterson (MathTrek)
How much is a megabyte? Many people don't really know. The problem originated decades ago when computer professionals noticed that 2^10 is very nearly equal to 1,000, and they began using the metric prefix "kilo" to mean 1,024. That was okay when computers
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 Counting Cards  Chris Taylor
A teaching aid that uses simple graphic designs on cards to represent different place values and numbers, from 1 up to one million, for teaching addition, subtraction, multiplication, division, and place value concepts. The site offers a teachers guide,
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 Counting: The Beginning of Mathematics  Interactive Mathematics Miscellany and Puzzles, Alexander Bogomolny
An introduction to and a detailed description of the process of counting, with applets for exploring addition, multiplication, and division.
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 Counting to Calculus: Mathematics  William K. Bradford Publishing Co.
Math software, printed supplements, workbooks, textbooks, posters, and teacher tools available for Elementary, Middle and Secondary math curriculum.
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 Count Madness Number Puzzles  James E. Garner
Cards with questions covering a wide range of subjects, each of which can be answered with a counting number. Answers are upsidedown on the card. Examples and ordering information provided on site. Teacher's copy available.
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 Count On  Department for Education and Employment, UK
Activities and resources  some simple and some fancy  for parents, teachers, and students. Resources offers, among other things, guides: to mathematical misconceptions; for parents helping with homework; for promoters of math fairs; and for providers
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 Cours de Maths de Collège Pour les Professeurs  Jean Goujon
Les chapitres d'un cours de niveau sixième; et des progressions des niveaux sixième, cinquième, quatrième, et troisième.
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 Course Project Suggestions (Geometry and the Imagination)  Conway, Doyle, Gilman, Thurston; The Geometry Center
An list of suggestions for projects in geometry, topology, symmetry, making geometric solids, calendars, spherical and hyperbolic trigonometry, puzzles, models, etc. Projects were to be exhibited at the Geometry Fair at the end of the course.
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 CourseServer  Jud Cornish; Fairbanks Country Day School, San Diego, CA
A Webhosted math problem generator that allows you to select from thousands of different problem types and automatically generate problemandanswer worksheets in your browser that can be printed out. Choose from a list of courses from Grade 1 (beginning
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 Covering Up (MatheMUSEments!)  Ivars Peterson (Math Muse for Kids)
Have you ever wondered why the cover of a manhole is nearly always round? Why couldn't it be oval or square? The usual answer is that a circular lid, unlike a square or an oval cover, won't fall through the opening, but the circle isn't the only shape
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 CPO Online  Cambridge Physics Outlet
A company founded by teachers and scientists that creates handson equipment and curriculum for teaching science, math, and technology from grades 412 and beyond, and provides effective professional development in science and math that is both content
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 Cracking a Medieval Code  Ivars Peterson (MathTrek)
The first printed book on cryptology was written by Johannes Trithemius (14621516), an abbot in Spanheim, Germany, who was one of the leading intellectuals of his day. Bearing the title Polygraphiae libri sex ("Six Books of Polygraphy"), it was published
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 Crafty Puzzles  James Cole, The Crafty Puzzles Company
A U.K. establishment selling wooden puzzles of all sorts: jigsaw puzzles, puzzle boxes, brain teasers, models, and functional pieces.
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 A Crash Course in Symbolic Logic  D.J. Brasier; Math Forum, Ask Dr. Math FAQ
Is symbolic logic so hard that some people will just never be able to get it? In a gentle introduction to the notation and rules of derivation used in symbolic logic, Dr. Achilles shows why the answer to that question is 'No'.
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