61. The Contest Center - Math Puzzles For Experts Tough puzzles requiring mathematical skill W, I, N. I, O. N, O, W. Mathematical Puzzles The Contest Center 59 DeGarmo Hills Road Wappingers Falls, NY 12590, W, I, N. I, O. http://www.contestcen.com/expert.htm

Tough puzzles requiring mathematical skill W I N I O N O W Mathematical Puzzles The Contest Center 59 DeGarmo Hills Road Wappingers Falls, NY 12590 W I N I O N O W Like this site? Please tell a friend Please sign our Guestbook All of the mathematical puzzles on this webpage are very challenging. We will post the names of anyone who solves them. * indicates I have only a partial solution. ** indicates I do not have a solution. ** Rubin's Conjecture Prove or disprove that every integer can be expressed as a sum x a + y b + z c where x, y, z, a, b, c are all integers, and For a table showing how each of the integers from -100 to +100 can be expressed in this form CLICK HERE . I have verified the conjecture for all integers between -10^4 and +10^4. ** Rubin's Second Conjecture Prove that every whole number can be expressed as the sum of 4 distinct squares, except for numbers of the form n s where s is any number in the set Stockholders The Foodlemyer Corporation has 12 stockholders. Whenever a major decision is needed, they vote, each person getting one vote for each share of stock owned. What is the smallest total number of shares possible so that no vote can ever be tied (regardless of how many stockholders participate), and no group of stockholders can ever outvote a larger group? Solved by: Lee Morgenstern ** Copycats Club On the first ballot the members vote independently, with probability P, for the motion. On all subsequent ballots they vote as described above. A unanimous vote is required to pass or defeat any motion. As a function of N, K and P, what is the probability that a given motion will pass or fail? How many ballots will be needed?

62. The Contest Center - Harder Math Puzzles Tougher mathematical puzzles for better solvers W, I, N. I, O. N, O, W. Harder Puzzles The Contest Center 59 DeGarmo Hills Road Wappingers Falls, NY 12590, W, I, N. I, O. http://www.contestcen.com/math.htm

Tougher mathematical puzzles for better solvers W I N I O N O W Harder Puzzles The Contest Center 59 DeGarmo Hills Road Wappingers Falls, NY 12590 W I N I O N O W Like this site? Please tell a friend Please sign our Guestbook We will post the names of anyone who solves any of these puzzles. Chests You are in a room with 2N Plaminians and C locked chests. One of the chests contains a treasure. Half of the Plaminians are consecrated, and know which chest contains the treasure. The other Plaminians do not know which chest has the treasure. All of the Plaminians know which ones are consecrated, but you do not know which Plaminians are consecrated, or which chest has the treasure. The Plaminians have agreed that you may ask each one a yes/no question, and they will answer truthfully if they know the answer, and randomly if they do not know. What sequence of questions will give you the greatest chance of locatiing the chest with the treasure? For what values of N and C is success guaranteed? Consecutive Integers (base on an idea from Denis Borris Consider sequences of consecutive integers A, A+1, A+2, A+3, ..., B-1

63. Education World® - *Math : Math Games : Math Puzzles About Us Add A Site Advertisers Contact Us Help Newsletters. Up One Level TOP *Math Math Games math puzzles. There are 279 entries in this category. http://db.education-world.com/perl/browse?cat_id=2839

64. Math.com Puzzles, Games, And Contests Free math lessons and math homework help from basic math to algebra, geometry and beyond. Students, teachers, parents, and everyone can find solutions to their math problems instantly. Wonders of http://www.math.com/students/puzzles/puzzleapps.html

Home Teacher Parents Glossary ... Email this page to a friend More Games Peg Solitaire Fiver Hare and Hounds Tower of Hanoi ... Maze Generator Resources Cool Tools References Test Preparation Study Tips ... Wonders of Math Search Math isn't only about numbers - math skills are found in puzzles and games too. Take a look at this collection of games from all over the world. (Java required) Peg Solitaire Also known as a board game called Hi-Q Fiver A simple and surprisingly addictive puzzle. Hare and Hounds A 19th-century board game invented in France, also called The Military Game . It was popular among French army officers during and after the Franco-Prussian war. Tower of Hanoi The classic puzzle, a favorite of programmers and Buddhist monks. TacTix Created by the brilliant Danish inventor Piet Hein, TacTix is a variation of Nim, one of the oldest of mathematical games. Hex-7 An elegant game of strategy invented in the 1940's, Hex is no longer available commercially but has recently seen an increase in popularity.

65. Interactive Mathematics Activities Interactive java puzzles and activities in different mathematical topics. http://www.cut-the-knot.org/Curriculum/index.shtml#magic

CTK Exchange Front Page Movie shortcuts Personal info ... Recommend this site Interactive Mathematics Activities Memory and Matching Match answers Memory - Easy Memory - Medium Memory - Hard Arithmetic 2 Pails Puzzle 3 Jugs Puzzle 3 Jugs Puzzle in Barycentric Coordinates Abacus in Various Number Systems ... Two Simple Equations Algebra Binary Color Device Breaking Chocolate Bars Candy Game: Integer Iterations on a Circle Chebyshev polynomials ... Heads and Tails counting, invariance Identities in the Multiplication Table Integer Iterations on a Circle II superposition principle Interest Calculations Letter Count in a Sentence Logistic Model Mean Values ... Merlin's Magic Squares modular arithmetic, boolean and linear algebra Minimax Principle Modular Arithmetic Parrondo Paradox Via Simpson Paradox Plus or Minus parity, invariance PolygonalNumbers Pythagorean Triples Self-documenting Sentences Simpson Paradox ... Squares and Circles parity, invariance Squares, Circles, and Triangles modular arithmetic, invariance Sum of Consecutive Integers is Triangular Sum of Consecutive Odd Numbers is Square Sum of Consecutive Triangular Numbers is Square Toads And Frogs Puzzle counting, logic, problem solving What's next?

66. Interactive Mathematics Miscellany And Puzzles Features instructional games and puzzles based on a variety of math topics. Includes more serious articles about the language of math and related links. http://cut-the-knot.com/

67. K-12 Math Problems, Puzzles, Tips Tricks K12 math Problems, puzzles, Tips Tricks Links to calculation tips (Beat the Calculator, Divisibility Rules, Multiplication Tips), math Problem sets, and math number and line puzzles. math Forum http://rdre1.inktomi.com/click?u=http://mathforum.org/k12/mathtips/&y=022E58

68. Problems, Word Games, Puzzles, Brainteasers, And Wordplay Solve math problems, brainteasers, word games and riddles. Featuring a selection of free puzzles to help develop problem solving and lateral thinking skills. http://www.theproblemsite.com/

The Problem Site Welcome to The Problem Site , a special problem solving site for both students and adults. This site hosts 'Problem Of the Week' and 'Problem of the Month' pages, maintained by educators, mathemeticians, puzzle enthusiasts, and others who care about students' ability to think critically. Please visit any of the pages listed below. You can stop in just to get the problems, or you can compete against others around the world by submitting solutions. To submit solutions, you must have cookies enabled in your browser. Have fun! Public Problem Pages At The Problem Site The Maine Page The Maine Page is designed to help high school students from the state of Maine prepare for the Maine Association of Math Leagues math competitions.( visit this page Doug's Brain Food Brainteasers, riddles, and word games can be found here. A well rounded knowledge of many subject areas will help you do well with this hodgepodge of puzzles! ( visit this page MathHS: Graeme's Problem of the Month This problem page contains high school level math problems updated monthly.( visit this page Mr. T's Calculus Problems

69. Flooble :: Perplexus :: Logic Puzzles, Brainteasers, Riddles And Math Tricks To access this page on the new site, go here perplexus.info logic puzzles, brainteasers, riddles and math tricks (Your old login and password will still be http://www.flooble.com/perplexus/

All about flooble fun stuff Get a free chatterbox ... Avatars Notice: this site has moved to perplexus.info That's right - we now have our own new domain. These pages will eventually stop working, so please update your bookmarks! To access this page on the new site, go here: perplexus.info :: logic puzzles, brainteasers, riddles and math tricks (Your old login and password will still be valid on the new site) Home Welcome to perplexus.info , flooble's perplexing puzzle portal. Here, we collect all sorts of puzzles, from simple logic questions and word tricks to in-depth math problems like probability and geometry. Click around and see if your brain is up to the task! If you're new here, make sure you sign up so that you can leave comments and submit your own problems! Categories All Problem Categories Latest: Geosynchronous Orbit (in Science Rating: 3.00 A prominent politician recently proposed, as part of our SDI, to place a defensive satellite in geosynchronous orbit directly above Washington, D.C. What if anything is wrong with his suggestion?

70. Logicville Educational puzzles, brain teasers, mathematical recreations and word games. A resource for anagrams, cryptograms, alphametics, word puzzles, logic problems, doublets, tangrams, chess, and math quizzes. http://www.logicville.com/

L O G I C V I L L E List of Puzzles Cryptogram Quiz Bookstore Puzzle Categories ... Word Puzzles, Mathematical Recreations, Anagrams, Cryptograms, Doublets, Tangrams, Cryptarithms, Chess, and many more... Press control-D to bookmark this web site. Puzzle of the Week MAGIC WORD SQUARE A magic word square is a square array of letters such a valid word is found in every row and every column of the array. Form a magic word square by filling the 4x4 square array below using only the letters RED shown below. These letters may be used more than once. V E L B R O W This puzzle is INTERACTIVE in Java-enabled browsers. Select a letter by clicking on any red letter above, then Click on the cell that you want the selected letter placed. TRY THESE SPECIAL PUZZLE SERIES: DUAL CRYPTOGRAM CHALLENGE TANGRAM CHALLENGE CRYPTOGRAM CHALLENGE I CRYPTOGRAM CHALLENGE II ... Mathematical Puzzles Puzzle Categories: Mathematical Logic Anagrams Chess ... Tangrams Try our Doublet puzzles: BEAR BUSH CHAD GIVE ... Cryptogram Challenge II Which puzzle type interests you most?

71. The Math Goodies Puzzle Library math puzzle, click here, computer puzzle. Lessons. CD. About Us. Articles. For each Volume of our Interactive math Lessons, we have a corresponding set of puzzles. http://www.mathgoodies.com/puzzles/

math puzzle click here computer puzzle Lessons CD Forums Homework ... Newsletter numbers Advertise Recommend Puzzles About Us ... Articles We have 68 puzzle pages in this section including crosswords, word searches, and solutions for each. For each volume of Interactive Math Lessons , we have a corresponding set of puzzles. Additional themes are taken from various topics in Math and Computers. Instructions for printing are at the top of each page. Since our puzzles are created with images, printing may take a little longer than plain text. MATH THEMES CROSSWORD WORD SEARCH CIRCLE Puzzle Solution Puzzle Solution INTEGERS Puzzle Solution Puzzle Solution NUMBER THEORY Puzzle Solution Puzzle Solution PERCENT Puzzle Solution Puzzle Solution POLYGONS Puzzle Solution Puzzle Solution PRE-ALGEBRA Puzzle Solution Puzzle Solution PROBABILITY Puzzle Solution Puzzle Solution STATISTICS Puzzle Solution Puzzle Solution SPECIAL THEMES CROSSWORD WORD SEARCH GENETICS Puzzle Solution Puzzle Solution HISTORY OF MATH Puzzle Solution Puzzle Solution OCEAN MATH Puzzle Solution Puzzle Solution MATH AND ART Puzzle Solution Puzzle Solution COMPUTER THEMES CROSSWORD WORD SEARCH COMPUTER Puzzle Solution Puzzle Solution INTERNET Puzzle Solution Puzzle Solution POWER POINT Puzzle Solution Puzzle Solution SPREADSHEET Puzzle Solution Puzzle Solution WORD PROCESSING Puzzle Solution Puzzle Solution ... Recommend This Page!

72. Billy Beaver's Game Show! Arcade games, puzzles, mazes, word games, math games, tictac-toe, online coloring books, and jokes. http://blackdog.net/billy.html

document.write("") Advertising Banner Let's Have Some Fun! A note on the games and activities at BlackDog Choose your Game! Arcade Games Action Games Here! Protect your cities with Missile Command, escape the monsters in Centipedo, or save the world from alien invaders in UFO Attack. Play Catch Miss Kitty and Break-a-Brick, too. Oh - Don't miss Falling Stars, either! If you enjoy action games, here they are! If you're looking for Pixie Roundup or the Bridges Game , they've been moved here. Puzzles BlackDog's Puzzle-O-Rama! Daily Puzzles - A different puzzle every day of the year! Word Games BlackDog's Word Games At BlackDog, words dance, whirl, hide, mix themselves, encrypt themselves and get crossed up. Lots and lots of word games to play on and off-line. There are hangman games, word meister, and even a typing test! Kids: If you're looking for the Olympics, Lord of the Rings, Harry Potter and Pokemon word games, they're here, too. And don't miss BlackDog's Daily Word Search Game . A new word search game every day of the year. Fun! Need some practice with math? With BlackDog's Math Flash Cards you'll be a math wizard in no time. They're fun, too!

73. The Science Education Centre At Funda College, Soweto Provides innovative learning and teaching materials for physics, chemistry, biology and math. Includes sample exams, tutorials, puzzles, labs or experiments to do at home, and many photographs and diagrams to assist in understanding. http://www.sec.org.za/

74. Authorization Failure... Galleries, puzzles, and screen savers. Javascript and Java enabled browsers required. http://www.artbymath.com/

Access Denied! This Server Message is displayed for any one of these reasons... The Server has detected a BOT, Search-Engine or Agent that is not allowed to access the site. allowed without appropriate permissions from the site owner. http://www.Lynxis.com

75. Jonathan's Homepage Practical math problems and Tolkien resources. http://www.geocities.com/jonalexdeval/

76. Perplexus.info :: Logic Puzzles, Brainteasers, Riddles And Math Tricks Here, we collect all sorts of puzzles, from simple logic questions and word tricks to indepth math problems like probability and geometry. http://perplexus.info/

All about flooble fun stuff Get a free chatterbox ... Avatars perplexus dot info Home Welcome to perplexus.info , flooble's perplexing puzzle portal. Here, we collect all sorts of puzzles, from simple logic questions and word tricks to in-depth math problems like probability and geometry. Click around and see if your brain is up to the task! If you're new here, make sure you sign up so that you can leave comments and submit your own problems! Categories All Problem Categories Latest: Geosynchronous Orbit (in Science Rating: 3.00 A prominent politician recently proposed, as part of our SDI, to place a defensive satellite in geosynchronous orbit directly above Washington, D.C. What if anything is wrong with his suggestion? No Solution Yet, 4 Comments Submitted on 2004-06-05 by SilverKnight Bonus: The walkaround (in Tricks Rating: 2.58 Two men meet each other and one says to the other "I bet you I can walk around you three times, and before I walk around you the third time you will move your feet off of that spot you're standing on. On top of that i will do it without hitting or touching you in any physical way." The other man says "I bet you 20 bucks you can't." After saying this he stood still and was preparing for the man to circle around him.

77. Hypatia-phd's Math Page! Devoted to mathematics and mathematics education. Original lesson plans and class information for teachers; links to NCTM, MAA, lateral logic puzzles and other resources. http://www.geocities.com/hypatia-phd/Math.html

Hypatia-PhD's Math Page Mathematics Association of America Do Math! (from NCTM) National Council of Teachers of Mathematics Info about Hypatia RCML Problem Solving Activities Math 305 Classes Kayak-Themed Unit Plans Favorite Math Links Coming Soon! Back Home E-Mail Me Guestbook This site is a member of WebRing. To browse visit This Math Online International site owned by Hypatia Previous 5 Sites Previous Next ... List Sites

78. Halloween Theme Unit - Reading, Worksheets, And Puzzles! Includes math worksheets, word finds, crossword puzzles, scrambled words, and other printable materials. http://www.edhelper.com/halloween.htm

Return to edHelper.com October Theme Units and Daily Themes Halloween Worksheets! Math Worksheets, Word Finds, Crossword Puzzles, Halloween Scrambled Words, Halloween Vocabulary, Halloween Word Chop, ... Halloween Reading Comprehensions Halloween Poetry (Grades 5-7) Trick or Treat Sled Run Treats or Tricks No Fun Tonight ... Skeletal System - Healthy Bones Halloween Animal Reading Comprehensions Bats (Easy Version) Bats Spiders (Easy Version) Spiders ... Owls Halloween Logic Printable Halloween Logic Printable - Names, Costumes, and Pieces of Candy Halloween Math Worksheets Easy Halloween Addition and Subtraction Problems Halloween Money Problems Halloween Time Problems Halloween Multiplication and Division Problems ... Halloween Algebra Problems Metric System Word Stories Halloween Metric System Word Problems Fall Shapes Fall Shapes Halloween Coloring Owl Bat Pumpkin Treats ... Label the Skeleton Halloween Dot to dots Cat (Dot to Dot) Ghost (Dot to Dot) Haunted House (Dot to Dot) Owl (Dot to Dot) ... Treats (Dot to Dot) Halloween Puzzles Customize Printables - edit and save words and definitions edHelper.com subscribers

79. Nancy Casey math projects for notnecessarily-mathematical-people constitute my official WWW raison d that aren t in the official version of Megamath Some new puzzles; http://www.cs.uidaho.edu/~casey931/

Nancy Casey Math projects for not-necessarily-mathematical-people constitute my official WWW raison d'etre. Recently I have tried to explain what MegaMath , the most extensive of these projects, is all about. Here are some things that aren't in the official version of MegaMath:: Some new puzzles Improvements in the part about knot theory Simple-to-learn, but tricky games . If you study them carefully, though, you can always figure out how to win. (Provided your opponent hasn't studied them as carefully as you.) In other parts of my life, I make bread, write poems , spin, knit, and ride my bicycle. My children, Patrick and Elizabeth, are 13 and 11 years old respectively. Also, I like to go backpacking and camping, do yoga (I can stand on my hands!) and juggle. I am an organic gardener, planting more and more periennial flowers and bulbs every year. This year's seed order reflects that trend. I'm not sure where I'll find room for the vegetables this year. I try to eat chocolate at least once a day. November 1995, I took a trip to

80. Earth Day Theme Unit - Worksheets, Activities, Lesson Plans, Word Search, And Mo Earth day logic, math, word searches, crosswords, spelling, and vocabulary worksheets. http://www.edhelper.com/EarthDay.htm

Return to edHelper.com Science Units April Theme Units and Daily Themes Earth Day Theme Unit Reading Comprehension The Problem with Trash (Earth Day Theme) Hybrid Cars (Earth Day Theme) Animals in Danger! Good Clean Earth (Earth Day Theme - Grades 4-6) ... Pollution Management Earth Day Logic Worksheets How many cans and junk mail letters were recycled? What is the fuel economy of each car? Earth Day Math Worksheets Earth Day Math Stories (Grades 1-2) Earth Day Math Stories (Grades 3-4) Earth Day Math Stories (Grades 5-6) Earth Day Addition and Subtraction ... Earth Day Electricity Math Worksheet Earth Day Story Starters and Borders for edHelper.com subscribers Earth Day borders with Earth Day story starters Animals Animal Units Endangered Animals Theme Unit Rain Forests ... Theme Unit Earth Day Coloring Earth Day Coloring Page Earth Day Word Builder Puzzles Build Words from Earth Day Words Build Words from Earth Day Words (includes Word Search) Earth Day Printables Customize Printables - edit and save words and definitions edHelper.com subscribers Earth Day Spelling Maze Earth Day Word Search (10 Words) Earth Day Word Search (All Words) Earth Day Word Search (All Words - lowercase) ... Earth Day Word Search (Larger Word Search!)

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