 CalculationRankings  Youri Lieberton
Arithmetic problems to solve or number sequences to complete as a stopwatch counts down. Play the games to compare high scores against other speedy problem solvers; take the timed tests to see correct answers after submission.
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 Calculations and Formulas for Gemstones  Dendritics Incorporated
Calculate the carat weight or specific gravity of a gemstone or the value of precious metals in various currencies, or convert weights among grams, carats, pennyweights, and ounces.
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 A Calculator
JavaScript calculators: the four basic operations, average, arithmetic congruence, greatest common divisor (GCD), least common multiple (LCM), radical simplifier, word converter that writes out numerals, and more.
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 calculator.com  Athera Corporation
Free access to online calculators to help you solve problems and answer questions in the home, office, and school. There are calculators for finance, business, and science, cooking, hobbies, and health. Some solve problems, some satisfy curiosity, and
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 Calculator Directory  ArsRef LLC
Commercial calculating software arranged by category. One page of free online calculators.
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 A Calculator  Eric Fuller
This JavaScript calculator supports the four basic arithmetic operations, and features simple memory, square root, and percent functions.
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 Calculatorium  Nenad Mitrovic
JavaScript calculators for determining area, perimeter, surface area, volume, trigonometry, algebra, statistics, finance, conversions, health, and more. See also Calculatorium's timed, autoscoring tests and typeset formulas.
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 Calculators By Ken  Ken Prentice
Calculators for Windows that convert between different units, create calendars, perform basic physical computations, and more. Read descriptions, or download sample programs.
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 Calculators By Ken  Ken Prentice
Dozens of pointandclick (mouseonly) calculators available for purchase: acceleration, air flow, ANSI codes, area, atomic mass, BTU, calendars, calories, capacitance reactance, circles, circular angles, circular mils, cone, conveyor speeds, current
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 Calculators for Multiplying Vectors  William C. Corwin
Special purpose calculators: determine crown molding, find the bearing for a sundial (sun compass), face towards mecca, predict shadows, solve triangles (given angles or sides or ratios), apply Cramer's Rule, solve three equations with three unknowns
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 Calculators OnLine Center  Martindale's Reference Desk
Online software and Java applets that calculate quantities for a number of general and specific uses. Numerous "calculators" available for Code Translators, Distance/How Far is it?, Finance, Taxes, Grade Point Average, Logic & Syllogism, Navigation/GPS,
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 Calculators OnLine Center: Part II  Mathematics  Martindale's Reference Desk
Over 7,420 calculators for: Unit Conversion (Time, Distance, Length, Speed, Weight, etc.); Abacus; Basic Math; Complex Mathematics; Complex Math Education; Complex Math Calculators by Specialty: Algebra and Linear Algebra; Algorithms; Calculus; Central
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 Calculus in Motion  Audrey Weeks
Geometer's Sketchpad animations of mathematical concepts from middle school through high school. Three products are offered: Calculus in Motion (161 animations Including animations of 20091997 AP Exam AB & BC Free Response Questions); Algebra in Motion
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 Calculus Made Easy  Ivars Peterson (MathTrek)
There's something about calculus that can evoke a mixture of both wonder and dread. I was recently reminded of my first encounter with calculus by the announcement of the publication later this year of a new edition of the book Calculus Made Easy (Sylvanus
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 The Calendar and the Days of the Week  Math Forum, Ask Dr. Math FAQ
What years are leap years? What day of the week will it be a year from today? How do I find the day of the week for any date? How do I find a calendar for any year? How common are Friday the 13ths?
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 Calendar Quirks  Ivars Peterson (MathTrek)
Calendars represent our efforts to create frameworks that allow us to reckon time over extended periods. We normally count the day  the time it takes Earth to rotate once on its axis  as the smallest unit of calendrical time. The measurement of fractions
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 Calendars and Astronomy (Math and the Heavens)  Dave Rusin, The Mathematical Atlas
Moreorless mathematical posts related to calendars and astronomy: background information on calendar traditions and a discussion of the mathematical aspects of the calendar, with a pointer to the Calendar FAQ; the related questions, on which day of
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 Calendars  L. E. Doggett
An introduction to calendars: what they are; astronomical bases of calendars; calendar reform and accuracy; historical eras and chronology; the Gregorian Calendar  ecclesiastical rules, history; the Hebrew Calendar  rules, Determining Tishri 1, Reasons
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 Calendopaedia  The Encyclopaedia of Calendars  Michael Astbury
A Comparison of Calendars, including Julian, Gregorian, Mayan, and Hebrew, details about these calendars and their history, and brief notes on different ways we measure time.
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 The California Learning Resource Network  California Department of Education
An educator's guide to instructional technology resources that support California's curriculum frameworks and standards: if an instructional program marketed to schools uses a computer, a VCR or laserdisc player, a network or the Internet or any combination
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 California Mathematics Council (CMC)
A professional organization of educators dedicated to improving classroom instruction in mathematics at all levels. Goals: to foster excellence in school mathematics curricula and instructional programs, including assessment and evaluation; to promote
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 California Online Mathematics Education Times (COMET)  Carol Fry Bohlin
A weekly news journal designed for mathematics educators and educational leaders, COMET features information on current educational issues, web resources, professional events and opportunities, and news articles from California and across the nation.
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 CalmPlex: 3D Geometric Wooden Puzzles  R&A Media Inc. and Andy Snowie
A manufacturer of wood puzzles based on simple geometric shapes. Learn about the CalmPlex wooden puzzle, a twelve piece, mechanical puttogether manipulative that makes an 8x8 checkerboard, a 4x4x4 cube and over 50 other tessellated shapes: details, solution
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 Cambridge Physics Outlet (CPO) Online  Tom Hsu
An integrated math/science curriculum that builds skills in three levels for grades 48, 711, and 11/12+. Designed in 11 modules, the curriculum comes with student Activity Guides, detailed Teacher's Guides with full solutions, six kinds of assessment
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 Camel and Bananas  Math Forum, a Classic Problem from the Ask Dr. Math FAQ
What's the maximum number of bananas the camel can transport across the desert?
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 CAMI Educational Software
Creators of interactive educational software emphasizing learner efficiency, reinforcement, and flexibility; and offering diagnosis, practice, and remediation: "The CAMI methodology focuses on knowledge retention as opposed to knowledge transfer....,
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 CAMI Software
International software company, makers of math drill and practice programs. Covers subjects from preschool to early college levels. Company based in South Africa with offices in Australia, Finland, and the United Kingdom.
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 Camping in the Redwoods  Joan Callaway
Math questions based on a visit to see the California redwoods. Part of a sample lesson for the 6th grade "Staying in Shape... Mathematically," one of three ...Ellipsis Middle School Math Summer Practice Programs. An order form for the full set is provided.
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 Canadian Mathematics Education Study Group  David A. Reid, Acadia University
CMESG is a group of mathematicians and mathematics educators who discuss mathematics education issues at all levels of learning. The aims of the Study Group include studying the theories and practices of the teaching of mathematics, and exchanging ideas
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 Canberra Mathematical Association (CMA)  Faculty of Education, University of Canberra
A professional body with the following aims: to act as a lobby for mathematics educators in the ACT; to help keep teachers up to date; to encourage teachers to be lifelong learners; to network teachers across schools and sectors; to foster the love of
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 Cancer & Mathematics (MSTE)  Dildine, Silver; University of Illinois at UrbanaChampaign (UIUC)
An Internet Adventure into Cancer, Pattern Recognition & Image Analysis, and Geometry. Cancer is a group of diseases in which some body cells change their nature, start to divide uncontrollably, and may revert to an undifferentiated type. This lesson
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 Candy Byte Software  Nily Aharon
Mathamagica, for ages 711, provides rigorous math skill practice within an animated, interactive setting with colourful graphics and characters. Concepts include addition, subtraction, multiplication, division, sequences, greater than/less than, telling
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 Can i play this at home  Greg Pallis
Free online math drill games set in the soccer context of the 2010 FIFA World Cup. Select any of the 32 participating nations, then convert goalscoring chances before time expires in your group matches and elimination brackets by correctly answering
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 The Canonical List of Math and Jokes  David Ni
A searchable archive of jokes and other humor on general mathematics, proofs, statistics and statisticians, and mathematicians. Also, poetry and quotes.
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 Canterbury Mathematical Association (CMA)  Christchurch, New Zealand
Encourage and supports the teaching and learning of mathematics. Current events and issues; articles and reviews; teaching ideas; student work; information technology.
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 Car Budget Activity  Lawrence Klepinger
A handout from The Internet TESL Journal, Vol. III, No. 7, July 1997 (English as a second language). The activity can easily be adapted for different countries and is designed to show the importance of good budgeting and basic common sense when planning
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 Card Games  John McLeod
Rules and information, including probabilities, about card and tile games. Indices by alphabetical order, classified by mechanism and by objective (including a list of children's games), arranged by country and the types of cards. Also, commercial, solitaire,
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 Career Profiles 
AMSMAASIAM Mathematical Sciences Career Information Project
Mathematicians at work: practical answers to the question, Why should I study math? More than 40 short essays written by math majors around the country about the types of work they are doing after having received their undergraduate or graduate degrees.
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 Carol Hurst's Children's Literature Site  Hurst, Otis
A collection of reviews of books for kids, ideas of ways to use them in the classroom, and collections of books and activities about particular subjects, curriculum areas, themes and professional topics. Ideas for teachers, librarians, home schoolers
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 Carolina Science and Math Catalogs  Carolina Biological Supply Company
Teachers may request a free catalog with supplies for the math and science classroom. "Carolina Mathematics" includes math teaching supplies, books and workbooks, calculators, posters, tools, and gifts. Features some multicultural materials.
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 Carré d'As  Carré d'As
Mathématiques amusantes pour vous détendre: questions et solutions, challenges, la question des champions (qui sera remplacée quand 20 internautes auront réussi à trouver la solution avec une démonstration correcte dès le premier essai), et 229 questions
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 Cascade Math Systems  Cascade Math Systems LLC
Narrated screencasts of a multisensory approach to reviewing or refreshing understanding of patterns, whole numbers, fractions, integers, and more. See also Cascade Math's YouTube channel.
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 The Case Against Block Scheduling  Jeff Lindsay
An analysis and opinions. Sections include: Nature of the Problem, reviews of case studies (including Bateson's Canadian studies), Advantages of Block Scheduling, Suggestions for Improved Use of Time, Comments From Around the Country, Questions to Ask
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 Casio Classpad 300 Resource Center  Saltire Software
The Casio Classpad 300 is an intuitive pen based calculator with draganddrop mathematics and geometry. ClassPad.org is packed with resources to help both teachers and students access the full power of the ClassPad. It includes many explorations and
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 Casio Education  Casio America, Inc.
Calculators, technology, lesson library, activities and sample questions, and other calculator resources for grades K through college. See also Casio's news and events, testimonials, and customer
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 Casting Out Nines
This essay explains the technique of casting out nines, a method of checking one's answers in arithmetic problems by eliminating groups of numbers that add to nine.
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 Casting Out Nines  Math Forum, Ask Dr. Math Common Question
A selection of answers to questions about casting out nines, including proofs of why the method works.
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 Cast Your Vote! What's Your Opinion On Polling?  Annenberg Media
An exhibit that explores wellknown statistical concepts  random sampling, margin of error, and confidence  through activities where YOU play the pollster. Also included is a wealth of links to Web sites related to statistics. The exhibit is part of
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 CataList: Catalog of LISTSERV Lists  LSoft international, Inc.
From this page you can browse any of the approximately 30,000 public LISTSERV lists on the Internet, search for mailing lists of interest, and get information about LISTSERV host sites. This information is generated automatically from LISTSERV's LISTS
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 Catalog of Isohedral Tilings by Symmetric Polygonal Tiles  Doris Schattschneider
A collection of Sketchpad and JavaSketchpad files supplementing the article
"One Corona is Enough for the Euclidean Plane" by mathematicians Doris
Schattschneider and Nikolai Dolbilin. Tilings of the Euclidean plane by a single polygon are considered,
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