21. Recreational Math Recreational Math by Bernie Freidin 19992000. These grids have the following property take any four points in a rectangle formation {A, B, C, D} and they will satisfy the equation http://bork.hampshire.edu/~bernie/math/

Recreational Math by Bernie Freidin A B C D A D B C =1652625. I used to be very interested in finding large grids with this property - to this end I wrote some very complex programs to search for smaller grids and then "stitch them together" into larger grids. In the examples below, I have one 8 by 8 grid with 42 points on it (out of a total of 64), and one complete 6 by 4 grid with all 24 points - these were my master creations. I also found a complete grid which was 3 by 81, and I could have extended it even further, but the values were numbers hundreds of digits long. Another recreational math interest of mine has been square-packing. Here are a few examples I did: Last updated April 4th, 2000.

22. Recreational Math : Grey Matters Online Store, Grey Matters Online Store Sells items related to impressive mental feats, such as memory feats, lightning calculation and magic. Train and strain your brain to entertain! http://www.cafepress.com/greymatters/1274692

23. MathPuzzle.com Famous director assisting with a recreational math article wow. Math Puzzle on Futurama Tonight s episode of Futurama (MindSwitcher) involved http://www.mathpuzzle.com/

24. Mathematics Recreational Math | Tutorvista.com Recreational math is nothing but mathematics tricks, puzzles and math games. Maths is one of the most important subjects for every student. http://www.tutorvista.com/math/mathematics-recreational-math

25. Recreational Math Normal Topic Hot Topic (More than 15 replies) Very Hot Topic (More than 25 replies) Locked Topic Sticky Topic Poll http://www.ilearnmath.net/help/index.php?board=11.0

26. Math-by-Mail - A Correspondence Program In Recreational Math Mathby-mail is an extracurricular math enrichment program that gives students in school the opportunity to correspond with mathematicians and discuss topics in recreational math. http://www.allacademic.com/meta/p275598_index.html

document.write("first");document.write("previous");document.write("top");document.write("next");document.write("last"); FAQ Research All Academic Inc. Citation Math-by-Mail - a correspondence program in recreational math Abstract Word Stems Keywords ... Similar Titles Abstract: Math-by-mail is an extracurricular math enrichment program that gives students in school the opportunity to correspond with mathematicians and discuss topics in recreational math. The program is run by the Davidson Institute of Science Education at the Weizmann Institute of Science. The correspondence is done through a series of math booklets dedicated to topics in recreational math. The booklets are available either in hardcopy or online via a special purpose website dedicated to the program. The correspondence with the mathematicians is conducted via an online forum available at the website. The completed booklets are sent to the mathematicians by mail or submitted electronically for review. Math-by-Mail provides the talented student with enrichment that stimulates creative thinking and expands the student's knowledge way beyond the limits imposed by the curriculum and their peer environment. Teachers who run the program in their schools have found Math-by-Mail useful for talented students, providing them with mathematical challenges and broadening their math horizons beyond the scope of the regular class curriculum.

27. Recreational Math | TutorVista Now, we are going to see some tricks in math Trick 1 Mathematics recreational math Here, we may think any number in our mind then doing the given process, the answer http://www.tutorvista.com/topic/recreational-math

28. Math Puzzles For Kids Recreational math puzzles for gifted secondary students. Fun and Challenging Math Problems for the Young, and Young At Heart . These problems are aimed at junior high and http://www.eklhad.net/funmath.html

Fun and Challenging Math Problems for the Young, and Young At Heart These problems are aimed at junior high and high school students with a flare for mathematics and logic. These are "real world" problems, rather than abstract riddles about sets or trigonometry etc. The questions should be accessible to a wide audience, even if the answers are not. When you find a question that interests you, it's tempting to just read the answer at the end of this web page, but please don't - that would spoil the fun. Instead, think about the problem in your spare time for a few days. Talk about it with your friends. Then, if you're really not getting anywhere, or you think you've got the answer, come back and read the answer. Educators might want to present the problem on Friday, let the students think about it over the weekend, and talk about it on Monday. A school has 1,000 students and 1,000 lockers, all in a row. They all start out closed. The first student walks down the line and opens each one. The second student closes the even numbered lockers. The third student approaches every third locker and changes its state. If it was open he closes it; if it was closed he opens it. The fourth student does the same to every fourth locker, and so on through 1,000 students. To illustrate, the tenth locker is opened by the first student, closed by the second, reopened by the fifth, and then closed by the tenth. All the other students pass by the tenth locker, so it winds up being closed. How many lockers are open?

29. Baywood.com We are working on providing the Journal of Recreational Mathematics electronically as well. If you would like to be notified as to our progress, click here http://www.baywood.com/journals/previewjournals.asp?id=0022-412X

30. Risk Dice-Thrower And Probability Calculator Optional Enter up to 10 defender countries to be attacked sequentially. One attacker die will be left behind each time a country is conquered; the number displayed http://www.recreationalmath.com/Risk/

RISK® Dice-Thrower and Probability Calculator Attacker Defender Enter number of armies: country 1 Optional : Enter up to 10 defender countries to be attacked sequentially. One attacker die will be left behind each time a country is conquered; the number displayed represents the number of armies on the most recently conquered country. country 2 country 3 country 4 country 5 country 6 country 7 country 8 country 9 country 10 Calculation speed: Continue until: Maximum 10/second 5/second 2/second 1/second Someone wins Attacker has armies left Defender has armies left Probability of attacker victory: (country 1 only) Runtime message: For a detailed description of how the probability of victory is calculated, read the paper (Word document)

31. Baywood.com A journal devoted to the lighter side of mathematics. Featuring thought http://www.baywood.com/

Search Baywood’s Publications Advanced Search What's New @ Baywood? Announcements/Links Press Releases Our Newest Titles Forthcoming Titles Pre-Publication Offers Award Winning Titles Click here for Book Introductions Important Information Online Access Activation Instructions Transitions Join Our Mailing List Institution Licences ... JOURNAL TITLES Print/on-line access and article pay-per-view availability Emphasis is upon psychological and social studies of aging and the aged. However, the Journal also publishes research that introduces observations from other fields that illuminate the "human" side of gerontology. Click here for more info BOOK TITLES Available in print. Coming soon...ebooks A central thrust of this book is to show the need to move beyond a focus on gender differences, toward a life course perspective on adaptation to aging. Click here for more info

32. Recreational Math Recreational Math Brain Teasers discussion You have 120 coins, all of which are visually identical. E Except for one coin, they all weigh exactly the same. http://www.physicsforums.com/showthread.php?t=332035

33. Recreational Math - Blogs, Pictures, And More On Blogged I want to ride this loop on Friday. On Friday night, I have dinner and a ride planned with with Liza at 5pm. So I have to be home and in the shower by 4pm to be safe. http://www.blogged.com/topics/recreational-math/

var logged_in = ""; Submit a Blog SignUp Login Blog Directory ... Old Home Blogs about: Recreational Math Recreational math Cycling Spokane I want to ride this loop on Friday. On Friday night, I have dinner and a ride planned with with Liza at 5pm. So I have to be home and in the shower by 4pm... to be safe. The loop is 50 miles. About 38 of it is dirt/forest road. Planning for 6 hours of riding seems prudent. Drive is 2 hours each way. So, I need to leave my house no later than 6am Friday morning. Hmm. related tags: bike couple midnight century place ... Golf Stinks ... that wasn't refunded in full. He used the term "golfer math " in a way I had never heard. Actually, I never even heard of the term "golfer math ", never ... that has as many opportunities to cheat as golf does, and for the record, I am basing this on a recreational level. Obviously, pro tournaments have a ton of eyes watching every stroke. Golfer math has also been disguised ... related tags: clubs Math ematics and Multimedia Carnival #4 Wild About Math ... 46 economic (weights and measures) and one mod 7 recreational Math Hombre blog on November 8th. Submit your ... Carnival #2 Carnival #3 Please Help Promote the Carnival The

34. Library Of Books, Links & More: RECREATIONAL MATHEMATICS (BY AUTHOR NAMES) Mar 23, 2010 There are tons of books out there on Recreational mathematics. Recreational math is loosely defined as follows in Wikipedia Not all http://bookslinksandmore.blogspot.com/2010/03/recreational-mathematics-by-author

ABOUT US BLOG NAVIGATION GIFTED 101 HOMESCHOOLING 101 ... EARLY COLLEGE Wednesday, March 24, 2010 RECREATIONAL MATHEMATICS (BY AUTHOR NAMES) This is a continuation of the series of pos ts on Math books. There are tons of books out there on Recreational mathematics. Recreational math is loosely defined as follows in Wikipedia: "Not all problems in this field require a knowledge of advanced mathematics, and thus, recreational mathematics often piques the curiosity of non-mathematicians, and inspires their further study of mathematics. I personally think Recreational Math is a great way to introduce math concepts, and also learn to have fun with higher math learning, irrespective of any age or background. I am listing a few of the books here, which I hope is of help to someone. I am not listing the ages here because they are meaningless in the case of my children, to appreciate and learn things. But the links to amazon should give you some idea on the books whether it is suitable for your family/children. Some books maybe advanced, but you may find some interesting and accessible pages in these books to explore with your children. Some of these books could be used as part of a weekly or monthly fun math club a co-op class. Many of these books are available in the library as well. Please see this is not an exhaustive list. Also, do not forget to scroll down and check all those wonderful sites I have listed on Rec Math. Loads of stuff to see, explore and enjoy:)

35. World Of Escher - Roger Penrose That s right recreational math; the passion of Sir Roger Penrose who was recently knighted for his outstanding contributions to mathematics. http://www.worldofescher.com/misc/penrose.html

The place for everything Escher View Cart Checkout Help Home ... Contest Select an Artwork Another World II Ascending and Descending Balcony Belvedere Birds; 1926 Woodcut Bond of Union Circle Limit IV Continuous Knot Cycle Division Double Planetoid Dove Dragon Drawing Hands Dream Encounter Eye First Day of Creation Fish and Scales Gravitation Hand with Reflecting Sphere Hell Horseman; Reg Div Plane III House of Stairs Liberation Magic Mirror Man with Impossible Box Metamorphose I Metamorphose II Mobius Strip II Mosaic II Mummified Priests Periodic Design A13 Pine Fish Plane Filling Motif with Reptiles Print Gallery Puddle Rabbit Regular Division of Plane I Relativity Reptiles Rind Skull with Cigarette Snakes Snow Stars Still Life and Street Still Life with Sphere Sun and Moon Symmetry E105; Pegasus Symmetry E106; Bird Symmetry E110; Bird/Fish Symmetry E117; Crab Symmetry E118; Lizards Symmetry E128; Birds Symmetry E12; Butterfly Symmetry E21; Imp Symmetry E25; Lizards Symmetry E28; Three Birds Symmetry E32; Fish Symmetry E34; Bird/Fish Symmetry E47; Two Birds Symmetry E55; Fish

36. Math Forum Discussions - Alt.math.recreational.independent An unmoderated newgroup focused on recreational mathematics. Posts to this group do not disseminate to the alt.math.recreational newsgroup, or vice versa. http://mathforum.org/kb/forum.jspa?forumID=435

37. Recreational Math | Facebook Welcome to the Facebook Community Page about Recreational Math, a collection of shared knowledge concerning Recreational Math. http://www.facebook.com/pages/Recreational-Math/358980107513

Recreational Math 28 people like this. to connect with Wall Info Fan Photos Recreational Math + Others Recreational Math Just Others Recreational Math joined Facebook. March 12 at 2:13pm See More Posts English (US) Español More… Download a Facebook bookmark for your phone. Login Facebook ©2010

38. Recreational Mathematics File Format PDF/Adobe Acrobat http://math.fau.edu/Yiu/RecreationalMathematics2003.pdf

39. Curve-stitch Isometric Cube Curvestitch isometric cube design by Lionel E. Deimel. Curve-stitch Isometric Cube The figure above is an instance of a design I created more than forty years ago. http://www.deimel.org/rec_math/cube.htm

Home Up Next Curve-stitch Isometric Cube The figure above is an instance of a design I created more than forty years ago. (This figure is covered by a Creative Commons license. For more information, click here .) A framed version of it hangs on my kitchen wall. That picture is a negative print (i.e., white on black) of an India ink drawing on vellum. It is a minor conversation piece—first-time viewers are often surprised to learn that the drawing contains no curves. More amazing to me is that I drew it with drafting pen and straightedge without introducing major imperfections. I cannot imagine repeating the feat! The figure shown here is a conversion of output generated using Adobe PostScript . It doesn’t reproduce the razor-sharp lines of the original, but it does capture the spirit of the figure. I recently replaced most of the graphics on this page with PNG, rather than GIF images. These images are much sharper, but the page loads slowly because the image files are bigger. (Sorry about that.) A SVG graphic of this figure can be found here , although not all browsers will render it properly. (Try zooming in and out and notice how the image changes.)

40. RECREATIONAL MATHEMATICS Your browser may not have a PDF reader available. Google recommends visiting our text version of this document. http://www.ams.org/bookstore/pspdf/mbk-63-prev.pdf

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