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  All Sites - 6878 items found, showing 5451 to 5500

  1. Rolling with Reuleaux - Ivars Peterson (MathLand)
    Why is the cover of a manhole round? The usual answer is that a circular lid, unlike a square or hexagonal cover, won't fall through the opening. The circle works because it has a constant width, defined as the distance between a pair of parallel lines ...more>>

  2. Rolocu: the Colour Twist Puzzle - Charles Edge
    Use logic and planning to put the pieces into place so that all rows and columns have all the colours in them. ...more>>

  3. A Romance With Numbers - K. Venkatasubramanian
    Biographical information and thoughts about Srinivasa Ramanujan, from The Hindu, December 24, 1993. ...more>>

  4. Roman Numeral Date Conversion Guide - Christopher Handy
    A guide to deciphering Roman numeral year dates as commonly found in both modern and early printed books, including a Java applet that accepts Roman numeral input in the range 1-4,999 and converts it to Arabic form. The page explains the basic principles ...more>>

  5. Roman Numerals 101 - Oliver Lawrence
    The Romans used only seven letters; the combination of a letter and its position could represent any number. They also used a line above the letter, so the numbering system actually represents our own very closely, with fourteen different symbols. The ...more>>

  6. Roman Numerals and Dates - Paul Lewis
    An illustrated introduction to Roman numerals, including Roman dates and calendar conversion, history and uses, a page on The Great 1999 Question, and a quiz. Three conversion tables are provided: Numerical 1-1449; Numerical 1450-2100; and Alphabetical ...more>>

  7. Roman numerals and decimals (Classics log) - John Durham
    A letter to a Classics mailing list about the origin of and ease of calculation with Roman numerals. ...more>>

  8. Roman Numerals - Math Forum, Ask Dr. Math FAQ
    Basics: How do I read and write Roman numerals? What are the rules for subtracting letters? How do I write large numbers? Web resources: introductions, charts, calculators, and converters. Calculations: Did the Romans use fractions? How can I use Roman ...more>>

  9. The Roman Press, Inc. - Steven Roman
    Home page of a California mathematics professor, including research articles, books and textbooks, and software. ...more>>

  10. Ron Blond - Ron Blond
    Circle geometry applets to explore inscribed and central angles, tangents and radii, and tangents and inscribed angles. Also, applets illustrating the quadratic function (completed square and the discriminant), transformations of the sine and cosine functions, ...more>>

  11. The Roots of the Equation - James Cleveland
    Blog by a high school algebra teacher in New York City "trying to figure out how it all fits together ... [and] creating interdisciplinary problems, projects, and thinking." A Math for America (MfA) fellow, Cleveland has blogged since June, 2011, with ...more>>

  12. Rosebush Math Line Puzzles - Math Forum
    Three puzzles: 1) plant 7 rosebushes so that they form 6 straight lines with 3 rosebushes in each line. 2) plant 10 rosebushes in 5 straight lines with 4 bushes in each line. 3) plant 19 rosebushes in 9 straight lines with 5 bushes in each line. Questions, ...more>>

  13. Rossman/Chance Applet Collection - Franciso Garcia, Carlos Lima, and Beth Chance
    Applets for simulating confidence intervals for population parameter, t-intervals for different population shapes, behavior of regression line, histogram bin width, sampling Reeses Pieces, sampling 2002 U.S. Senators, sampling pennies, sampling words ...more>>

  14. ROSSMANCHANCE.COM - Allan J. Rossman & Beth L. Chance
    Workshops and presentations, publications, and current projects by the authors of the Workshop Mathematics Project textbooks. See tables of contents, instructor guides, sample syllabi and exams, and answers to activities from books in the Workshop Statistics ...more>>

  15. The Ross Program - The Ohio State University
    For high schoolers, the OSU Department of Mathematics offers an intensive summer experience designed to encourage motivated pre-college students to explore mathematics. Over the course of eight weeks, students are immersed in a world of mathematical discovery. ...more>>

  16. Rotations (SMILE) - Susan Nash, Lake View High School
    A lesson designed to teach students to define rotation as the composite of two reflections over intersecting lines; identify rotation images of a figure; and recognize and apply the properties of rotation. From the Graphs and Visuals section of a collection ...more>>

  17. Rough math: Focusing on rogue waves at sea - Ivars Peterson - Science News Online
    Ocean currents and large fields of random eddies can focus a steady ocean swell to create unusually large waves. A current or eddy field acts like an optical lens to focus the wave action, says applied mathematician Bengt Fornberg of the University of ...more>>

  18. Rounding a Decimal - NASA Lewis Learning Technologies Project
    Round 12.5861 to the nearest hundredth. A detailed answer is provided. From NASA's 9th Grade Math Proficiency Test. ...more>>

  19. Rounding Down? - Jim Loy
    This is an article about the difference between rounding and truncation, with some stories about the effects of rounding (or truncation) on computer programs. ...more>>

  20. Rounding Numbers - Math Forum, Ask Dr. Math FAQ
    How do you round a number to the nearest tenth (10th), hundredth (100th), thousandth (1000th), etc.? ...more>>

  21. Rounding Seconds - NASA Lewis Learning Technologies Project
    Erv ran the 110 meter high hurdles in 13.27 seconds. His teammate, Willie, ran the same race in 12.91 seconds. Rounded to the nearest tenth of a second, how much faster was Willie's time? A detailed answer is provided. From NASA's 9th Grade Math Proficiency ...more>>

  22. Rouse Ball's Fallacy - Interactive Mathematics Miscellany and Puzzles, Alexander Bogomolny
    A famous fallacy by Rouse Ball now implemented in Java. A proof that an obtuse angle is right. How can that be? ...more>>

  23. Route ICS (formerly DeweyWeb): Interactive Communications and Simulations - Univ. of Michigan
    An effort to link distant schools and expand the classroom experience: using telecommunications and computer conferencing, students can spend part of every school day in a "global classroom." Crossroads: The Route 12 Project is a grassroots attempt to ...more>>

  24. Row Your Boat - Ivars Peterson (MathTrek)
    Although a rowing shell with eight rowers is much larger than one with a single rower, all shells have roughly the same proportions (at least for the surface area over which the shell makes contact with water). Data from 2000-meter world and Olympic championship ...more>>

  25. Roxanne Eckenrode's Storefront - Lulu.com - Free Self-Publishing - Roxanne Eckenrode
    Self-published math worksheets. Several are free. They are downloadable and printable; correct answers will spell out a message or fill in a puzzle. ...more>>

  26. Royal Tyrrell Museum of Palaeontology
    Virtual site for a science museum named for Joseph Tyrrell, who in 1884 travelled to what is now Alberta, Canada to study coal deposits and found the first dinosaur remains ("Albertosaurus") in the Drumheller area. The museum's mandate is to collect, ...more>>

  27. RSA Laboratories' Frequently Asked Questions About Today's Cryptography - RSA Laboratories
    Cryptography FAQs organized into eight chapters: introduction, cryptography, techniques in cryptography, applications of cryptography, cryptography in the real world, laws concerning cryptography, miscellaneous topic, and further reading. With appendices ...more>>

  28. R. S. Schaeffer - Randy S. Schaeffer, Math & Computer Science, Kutztown University of Pennsylvania
    Schaeffer teaches a course called "Methods of Teaching Secondary Mathematics." Download the lessons created by his students that call on Geometer's Sketchpad, graphing calculators, and Microsoft Excel. Lesson topics address parallel lines, box and whisker ...more>>

  29. Rubik's Cube Information - Michael Reid
    All about Rubik's Cube - even a mailing list. Site contents include: the Nederlandse Kubus Club; Rubik's cube pages on the Web; Cube books; Sources of cube-like puzzles; the author's notes, including an optimal cube solver; other Cube solutions on the ...more>>

  30. Rubik's Cube Java Applet - Michael Schubart
    To twist the cube, press the mouse button over a cubelet face that belongs to the slice you want to move. Keeping the button pressed, drag the mouse in the desired direction; then release the button. Moving the whole cube is done in the same way - just ...more>>

  31. Rubik's Games - Androsoft
    Dedicated to the first PC CD-ROM game from Erno Rubik, Rubik's Games contains 5 sub-games: Rubik's Classic, Cover Up, Paint War, Rubik's Playground and ZigThrough. Download the Rubik's Games Web Site Plugin plug-in or a demo of the Rubik's Game CD-ROM. ...more>>

  32. Rubik's Online - Rubik/Seven Towns
    The official online site for the Rubik's cube. Play with the cube and other Rubik's games and puzzles online; find information on where to buy Rubik's products; use the forum to exchange views, opinions, comments, suggestions and anecdotes related to ...more>>

  33. Rubix Corner - Duane Cash
    The site includes information regarding the Duane Cash Cube Collection now featured at Hessport's Rubikshop in their "collectibles" section. New puzzles include the Rubik's Triamese, Fusion, Fusion+, SpeedFusion, 5x3, and 4x3 Cubes, which give those interested ...more>>

  34. Rudi Mathematici - Rudy d'Alembert, Alice Riddle, and Piotr R. Silverbrahms
    Matematica, giochi matematici, problemi, indovinelli e farneticazioni. Soprattutto una rivista, RM contiene Il Compleanno, Problemi del Mese, Bungee Jumpers, Soluzioni e Note, Quick & Dirty, Pagina 46, Paraphernalia Mathematica, Allegati ed Eventuali, ...more>>

  35. Rungs and Vineyards - Paul Kunkel
    Investigations of two interesting visual effects seen from a moving automobile. It includes two interactive perspective drawings, and a discussion of the cylindrical and planar projections used to create them. ...more>>

  36. Runiter Company - Saeid Nourian
    Demo or purchase software that plots math functions in 3D or in or grid sheets, rotates them, and manipulates them in real-time: Smart Math Calculator, Graphing Calculator, A&G Grapher (algebra and geometry), Statistics Problem Solver, and Calculus Problem ...more>>

  37. Russian Peasant Multiplication - Math Forum, Ask Dr. Math FAQ
    What is Russian peasant multiplication? How do I use it? Why does it work? How is the Russian peasant algorithm connected to binary numbers? ...more>>

  38. Russian School of Mathematics
    An after-school math enrichment program "based on the best practices of advanced math schools in Russia and Europe and adapted to the US educational environment." Co-founded in 1997 by Inessa Rifkin and Irina Khavinson — who recall that, in the ...more>>

  39. Rymar - Rymar Applications
    "Helping with math homework and concepts one app at a time." The Cramer's Rule app finds the solution of a system of equations with 2 or 3 unknown variables, and also reveals — via the "Help" button — all of the intermediate determinants. ...more>>

  40. Sabermetrics - The Baseball Archive
    "The search for objective knowledge about baseball." Read a primer of Bill James' findings, or David Grabiner's manifesto on Sabermetrics. Studies address minor league equivalencies ("Are minor league stats a good precictor of major league performance?"), ...more>>

  41. Sabernomics: Economic Thinking about Baseball - John-Charles Bradbury
    A blog on the economics in, and of, the game of baseball. Original tools and studies includes salary estimators, research on age and hitting and pitching, anti-trust and Major League Baseball, attendance and winning, Barry Bonds and walks, competition ...more>>

  42. SABER - The World Bank Group
    An open data tool that provides comparative data on education policies around the world. The Systems Approach for Better Education Results (SABER) web tool aims to help countries collect and analyze information on their education policies, benchmark themselves ...more>>

  43. SABES: System for Adult Basic Education Support - Massachusetts Department of Elementary & Secondary Education
    SABES promotes high quality adult basic education services through training, support, and resources that improve the skills and knowledge of practitioners and strengthen programs. SABES strives to achieve this mission by: providing staff development that ...more>>

  44. SACNAS Biography Project - Society for the Advancement of Chicanos and Native Americans in Science
    Highlights of the life stories and professional contributions of Native American, Chicano and Latino scientists, mathematicians, and engineers. The Project was created so that K-12 students could see themselves reflected in the stories of the lives that ...more>>

  45. Sacramento Area Math Help and Tutoring - Just Math Learning Centers
    Just Math provides math help, tutoring and SAT prep for Sacramento area children through college students. Skills training in elementary math, algebra, geometry, and calculus. ...more>>

  46. Sacred Geometry - Bruce Rawles
    "In nature, we find patterns, designs and structures from the most minuscule particles, to expressions of life discernible by human eyes, to the greater cosmos. These inevitably follow geometrical archetypes, which reveal to us the nature of each form ...more>>

  47. Sacred Geometry Discovery - J. Vincent Beall
    The Platonic solids are used to organize theosophical terms. The five regular solids are the basis for a three-dimensional map of the Kabbalistic Tree of Life. ...more>>

  48. Sage: Open Source Mathematics Software - William Stein, University of Washington
    An open source mathematics program designed to do everything from map a 12-dimensional object to calculate rainfall patterns under global warming--anything Maple, Matlab, or Mathematica would do. This free software reveals how it performs its calculations--so ...more>>

  49. Salinon: From Archimedes' Book of Lemmas - Interactive Mathematics Miscellany and Puzzles, Alexander Bogomolny
    A description of Archimedes' application of propositions from the second book of Euclid's Elements to mathematical proofs. An interactive Java exploration is provided. ...more>>

  50. Saltire Software
    Mathematical technology for industry and education. Saltire Software's core technologies are constraint-based interactive geometry systems, symbolic algebra, and optimization, with products for mechanical engineering, mathematics education and layout ...more>>


 
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