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  All Sites - 1746 items found, showing 1301 to 1350

  1. Project Euler - Colin Hughes
    Browse hundreds of challenging problems that require mathematical insights as well as computer and programming skills to solve. Popular puzzles include "Add all the natural numbers below one thousand that are multiples of 3 or 5," "By considering the ...more>>

  2. project Eureka
    project Eureka is a collaboratively edited site for problem solvers/creators—regardless of problem or field. Add problems with quantifiable results; or group problems in a test. ...more>>

  3. ProMath Archive - Dept. of Mathematics, University of Kentucky
    A 1995-96 competition offering Lexington area high school students an opportunity to work on interesting, challenging mathematical problems and to develop their problem solving skills and taste for individual work in Mathematics. The program had two complementary ...more>>

  4. Proofs in Mathematics - Interactive Mathematics Miscellany and Puzzles, Alexander Bogomolny
    A discussion of the value of proofs in the classroom, followed by a collection of proofs classified as either simple or charming. Simple proofs: Number of vowels in a Lewis Carroll game; Pigeonhole Principle; Number of X's and O's; Coloring points in ...more>>

  5. Proofs Without Words - Cut the Knot!, Alexander Bogomolny
    Martin Gardner wrote, "There is no more effective aid in understanding certain algebraic identities than a good diagram. One should, of course, know how to manipulate algebraic symbols to obtain proofs, but in many cases a dull proof can be supplemented ...more>>

  6. Proof: The Sum of Prime Twins is Divisible by 12 - Mathematics Dept., College of Marin
    Prime twins are prime numbers that are two numbers apart. For example 41 and 43 are prime twins. Can you PROVE that the sum of prime twins is divisible by 12? (This proof doesn't work for the prime twins 3 and 5.) ...more>>

  7. Public Domain Materials - Mike Jones
    A collection of public domain instructional and expository materials from a US-born math teacher who teaches in China. Microsoft Word and PDF downloads include a monthly circular consisting of short problems, "The Bow-and-Arrow Problem," and "Twinkle ...more>>

  8. Punctured Polyhedra - Ivars Peterson (MathTrek)
    A tetrahedron has four triangular faces, four vertices, and six edges. When a vertex of one tetrahedron pierces the face of a second tetrahedron it forms a new, more complicated polyhedron: one triangular face has a triangular "hole" where the face was ...more>>

  9. Pure Maths, Impure Thoughts - David A. Santos, Community College of Philadelphia
    Includes lecture notes in elementary algebra, linear algebra, number theory, probability, a problem seminar, plus review material in precalculus and multivariable calculus. Selections available en castellano. ...more>>

  10. Purplemath - Your Algebra Resource - Elizabeth Stapel
    Algebra modules provide lessons, practical tips, hints, worked examples, and point out common mistakes in basic triangle length (trigonometry) values, calculators (what model to buy), canceling units, domain and range, exponents, factoring quadratics, ...more>>

  11. Putnam Competition - Patrick J. Fitzsimmons
    Postscript, Adobe Acrobat, and dvi downloads of problem sets from the William Lowell Putnam Mathematical Competition dating back to 1980. With links to solutions hosted by others, and information on participation. ...more>>

  12. Putnam Exams - Dave Rusin
    Solution sets and comments compiled from postings on the sci.math newsgroup. Online resources and citations for exams dating back to 1987. ...more>>

  13. Put the Heart into Mathematics: Cardiac Output, Rates of Change and Accumulation (i-Math Investigations) - Illuminations; National Council of Teachers of Mathematics (NCTM)
    An online, interactive, multimedia math investigation. This activity explores the measurement of the amount of blood being pumped by a heart. The goal of this i-Math investigation is a rich exploration of concentrations (mixture problems), rates of change ...more>>

  14. PuzzleBeast - James W. Stephens
    A collection of computer-generated puzzles, some illustrated with Java applets, some with solutions included: The Fried Okra Perplexity, A Dozen Irritating Sliding Block Puzzles, The Bulbous Blob Puzzle, Meandering Monk Maze, The Kung Fu Packing Crate ...more>>

  15. Puzzle Choice
    A wide choice of puzzles and games for all ages, including crosswords, wordsearches, brainteasers, number puzzles (a calculator is provided), logics, teacher resources and other online games, including mazes. ...more>>

  16. Puzzle Fun - Rodolfo Kurchan
    An online newsletter edited by Rodolfo Kurchan (Buenos Aires - Argentina) about polyominoes and other puzzles. Back issues are on the Web. ...more>>

  17. Puzzlemaker - Discovery Education
    A puzzle generation tool for teachers, students and parents. Create and print customized puzzles, including math squares and number blocks, online, or buy a CD with editing tools and other extras. ...more>>

  18. Puzzle of the Week - Ralph Grove
    A small archive of math and word puzzles having to do with patterns, permutations, and probability, with solutions, from a professor of computer science at Indiana University of Pennsylvania. ...more>>

  19. Puzzle Page - The Black Stump Ltd.
    More than 150 links to puzzle sites on the Web. A new site is added each week. ...more>>

  20. Puzzler - Franklin Institute Online
    Puzzles from the inQuiry Almanack Puzzle Archive: e.g. Cryptograms, January, 1998. Coded messages hide famous quotations. A clue is offered to begin breaking the code, and an answer key is provided. One puzzle a month from March of 1995 through July of ...more>>

  21. Puzzlers - Bryan Clair, University of Chicago
    A collection of Clair's favorite puzzles (no discussion or answers are provided): The Nine Dots; Weighing Coins; The Dollar Hotel, Planning an Orchard; The Math Department; Tea and Cream; Bugs on a Square; River Crossing; More Crawling Bugs; The Unexpected ...more>>

  22. Puzzles
    A blog of math puzzles. Post your answers in the comments sections. ...more>>

  23. Puzzles/One-player Games - Jürg Nievergelt
    Rubik's Cube and its variants. The 3*3*3* cube; Rubik's Revenge (4*4*4 cube); Pyramix (tetrahedron); Rubik's Clock; Rubik's Magic. Also Cryptequations, polyominoes, and links to a list of similar puzzles. ...more>>

  24. Puzzles, & Riddles - The Contest Center - Frank Rubin
    Hundreds of puzzles and mathematical problems ranging from kindergarten through post-doctoral levels. For the easier puzzles, answers are provided on the site; names of those who submit correct solutions to harder problems are posted. See also Puzzles ...more>>

  25. The Puzzle TOAD - Tom Bohman, Oleg Pikhurko, Alan Frieze, and Danny Sleator, School of Computer Science, Carnegie Mellon University
    Send the authors your solutions to their challenging graph theory, number theory, geometry, discrete mathematics, logic, and other puzzles. Re-visit periodically to see the latest question, and download PDFs of solutions of past problems. ...more>>

  26. Puzzle Toons, The Citizen Scientist - Brian Mansfield
    A comic strip devoted to puzzles, mind benders, and brain teasers. The subject matter of the puzzles ranges from mechanical devices and geometry to astrodynamics, chess, and billiards. Read back issues of Mansfield's column, dating to its inception in ...more>>

  27. Puzzle University - Amy Galitzer
    A non-accredited "university," created solely for fun. Everything is free to play and take part in. Register, pass a simple test, and advance from freshman to sophomore to junior to senior to grad student this way. The puzzles get harder as you progress. ...more>>

  28. PuzzleWise - Test Best International, Inc.
    A supplemental program consisting of math crossword puzzles, each clue of which links directly to state and national grade-level math skill expectations. The site offers samples, testimonials, prices, and a free newsletter. ...more>>

  29. Puzzle World - John Rausch
    A searchable site with information and a discussion group (Puzzle Talk) about handcrafted mechanical puzzles. Most of the puzzles presented here are not the mass-produced variety found in stores, but limited production puzzles produced by craftsmen (often ...more>>

  30. Puzzle Zapper - Alexandre Owen Muñiz
    Original mathematical puzzles, some available in lasercut acrylic for sale: polyomino common superforms, pentomino coloring problems, miscellaneous polyomino explorations, flexible polyforms, square grid puzzles, visualizing sequences of numbers, Lissajous ...more>>

  31. Puzzling Lines - Ivars Peterson (MathTrek)
    Sol LeWitt has often featured geometric and combinatorial themes in his sculptures, paintings, and drawings. In 1973 he composed "Straight Lines in Four Directions and All Their Possible Combinations," a grid of 15 squares, each inscribed with one or ...more>>

  32. Puzzling Primes - Isaac Reed
    To fully comprehend our number system, mathematicians need to understand the properties of the prime numbers - but even finding them isn't so easy. ...more>>

  33. The Puzzling World of Barry R. Clarke - Barry R. Clarke
    Brain teasers from Clarke's column in The Daily Telegraph (UK) and from his various puzzle books: liar problems, logic teasers, number conundrums, matchstick puzzles, lateral mind-benders, and more. With links to other puzzles sites and an article on ...more>>

  34. Pyramids and Algebra - David C. Miller
    Four questions that explore the problem of creating a pyramid from a set of dominoes, dealing with the concepts of arithmetic series; derivation of square roots including a graphical method; scientific notation; exponential notation; quadratic equations; ...more>>

  35. Pythagoras' Haven - Jim Morey
    Step through a geometrical Java applet proof of the Pythagoraean theorem - the square of the hypotenuse of a right triangle is equal to the sum of the squares of the other two sides. ...more>>

  36. Pythagorean Puzzle (SMILE) - Earl Zwicker, Illinois Institute of Technology
    A lesson that models the phenomenological approach to enable students to prove the Pythagorean Theorem on their own using puzzle pieces and working together. From the Geometry and Measurement and Algebra and Trigonometry sections of a collection of almost ...more>>

  37. Pythagorean Theorem (Manipula Math) - International Education Software (IES)
    Java applets for experimenting with shifting, rotating, and moving pieces of quadrilaterals to prove the Pythagorean Theorem. ...more>>

  38. Pythagorean Theorem - Over 20 Proofs - Interactive Mathematics Miscellany and Puzzles, Alexander Bogomolny
    A general exposition of the Pythagorean theorem, with proofs from Euclid to Garfield - and more. Also links to other sites on the Web with proofs. ...more>>

  39. Pythagorean Theorem - Warren F. Davis, Davis Associates, Inc.
    An animated, non-mathematical, annotated proof of the Pythagorean Theorem, assumed to be the method of proof actually used by Pythagoras circa 550 BCE (see the Bronowski reference). ...more>>

  40. Q-Puzzle - XIAO Gang
    A mathematical jigsaw puzzle: your goal is to recover a disordered photo by finding the inverse affine transformation. A French version is also available. ...more>>

  41. Quandaries and Queries (Math Central) - Dept. of Mathematics and Statistics, University of Regina, Saskatchewan, Canada
    A math Question and Answer area for K-12 students and teachers, with searchable archives of past questions and answers. ...more>>

  42. QuantumBrainBenders - Joel Klebanoff
    A series of puzzles: find a series of numbers in a grid that add to the given sum. A new puzzle for each of three skill levels is posted daily. The site also includes an archive of previous puzzles. ...more>>

  43. The Quantum CyberTeaser - National Science Teachers Association (NSTA)
    Archive of bimonthly problems posed online by Quantum, the math and science magazine. The magazine ceased publication with its July/August 2001 issue. Puzzles and most solutions are still available here. ...more>>

  44. The Quest for the Holy Value - Kjetil Valstadsve
    Finding the correct value of pi. The likelihood of any random two integers having 1 as their greatest common divisor (no factors in common), has been proved to be 6 divided by pi squared - the numbers are prime in relation to each other. According to ...more>>

  45. Quia! - The Learning Group
    Create your own Java-enabled quizzes, home pages, and learning games to play over the Internet: enter your material into a form, select a few options, and press a button. Games have been created and are available for browsing in mathematics, as well as: ...more>>

  46. Quick Trig Lessons - Matt Robinson
    Brief lessons on ratios, triangles, identities, graphs, and formulas, with practice problems and a page of links to other math sites on the web. ...more>>

  47. Quiz Hub - Schmidel & Wojcik: Educational Web Weavers
    A collection of online interactive learning quizzes that help K-12 students enhance their core knowledge of English, languages, math, science, and social studies. Subscription required. ...more>>

  48. Quizma --> Matemática Cálculo Robótica - Harold Suárez Guzmán
    In Spanish: Clases y Orientación en Matemáticas Cálculo y Robótica. Fórmulas - Demostraciones - Ejercicios - Ejemplos - Cálculo Interactivo. Algebra, Logaritmos, Trigonometría, Geometría, Estadística, Ecuaciones, Problemas de Planteo, Funciones, Geometría ...more>>

  49. Quiz Me - D. Kell and Mercer County Community College
    Interactive quizzes constructed using software provided by Addison Wesley Longman Publishers. Auto-scoring, multiple choice self-tests on whole numbers (place value, operations, applications, rounding, roots and order of operations); fractions (equivalencies, ...more>>

  50. QuizStar - Advanced Learning Technologies, Center for Research on Learning at The University of Kansas
    Create online quizzes and organize the results. Features include the ability to attach multimedia files to questions, to make quizzes in multiple languages, and more. ...more>>


 
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