101. Cool Math .com - Math Lessons, Math Games, Math Puzzles - Percentage Problems Ca navbar math Sites kids ages 13100 algeba teachers parents math science free online games and puzzles continuing teacher education http://www.coolmath.com/calculators/percentage.htm

What is % of Answer: Or... is what percent of Answer: Ask an Expert Web Hosting Services HELP SUPPORT COOLMATH link to us text link advertising about us safe surfing ... continuing teacher education Thanks for visiting Coolmath.com

102. Maths Puzzles And Quizzes math explained in easy language, plus puzzles, games, quizzes, worksheets and a forum. For K12 kids, teachers and parents. http://www.mathsisfun.com/puzzle.html

HOME A-Z Listing Maths Menus Handling Data Miscellaneous Puzzles Calculators TI Calculators Computer Programs Winlogo Programs Other Bits Math Forum Contact Us About Us Privacy Statement MathsIsFun.com Maths Puzzles and Quizzes Try the links below to find some puzzles for you to try We now have More Puzzles Make a Letter T Make a Square Apple Problem ... Pool Balls Problem Not all problems will have a solution on this site. But if you need help either press the help button at the bottom of the problem page or try these links below Letter T Solved Letter F Solved Letter H Solved Square Solved ... Puzzles Forum MM_preloadImages('images/footer-over_02.jpg','images/footer-over_03.jpg','images/footer-over_04.jpg');

103. Homepage Of Torsten Sillke At Univ. Bielefeld German Puzzle Links. math 4 u geometric and inequality problems (German); Jürgen Köller s mathematische Basteleien - (English and German) http://www.mathematik.uni-bielefeld.de/~sillke/

Torsten Sillke That's me in small. List of publications and CV equal surnames in Germany Address: Augustenburgstr. 14, D-60488 Frankfurt/Main, Germany Tel: +49-69-764428 (privat) +49-69-696-91314 (office) Please visit my friends Where I am working for: LH Systems Problems Mathematical Problems - List of several open problems Stable sets - The most wanted problem If you have any information about one of the problems, please let me know. Results Results in Tiling and Packing - polycube and polysphere packings Martin Gardner - Contents of his books. Some Puzzles My most wanted puzzle is: Crossing the bridge Animated If you know any references (older than 1980) or the origin of this puzzle, please let me know. Operations Research Puzzles Crossing the bridge - with a lamp ( Crossing the bridge (long) discrete optimization - and a C program Logic Puzzles Sum Product - The impossible Puzzle Logic Puzzle - How old are they? lias and truth tellers - who is the spy? power 10 Mastermind - Errate die Kombination (German) Probability Puzzles expectation - number of fixpoint of a random permutation Random cyclic polygons - expected number of points which contain the center expectation - number of occurences of a fixed pattern in a 0-1-matrix (Truchet-tile) Partition Probabilities - Probability of a Factor (CRUX 2000) Red Black Game - How Often Should You Beat Your Kids Occupation - Likelihood Approximation expectation - Problem collection using Linearity Waiting time - poisson process

104. Math Forum Internet Mathematics Library: New Location Cool math Web Sites Games puzzles Mistakes Calculator Problem Cool math web sites. math mistakes, math games, puzzles, quizzes, calculators, challenges, problem generators, and more. http://forum.swarthmore.edu/~steve/steve/mathpuzzles.html

The Forum Internet Resource Collection has become The Internet Mathematics Library Please change your links and bookmarks to: http://mathforum.org/library/ Library Home Full Table of Contents Suggest a Link ... Library Help We now offer many more categories, selected starting points, updated entries, and powerful search and browse functions. We hope you find this enhanced presentation helpful as you search for mathematics sites on the Internet. Please search and browse the new Library. Here are a few shortcuts: Mathematics Topics, from Algebra and Arithmetic to Statistics and Topology... Resource Types Lesson Plans and Activities Problems and Puzzles Mathematics Education Topics - Teaching Issues and Strategies, Research and Reform... About the Internet Mathematics Library We are now cataloguing only mathematics and math education sites. Home The Math Library Quick Reference Search ... Help http://mathforum.org/ webmaster@mathforum.org

105. ENC Online: ENC Features: Classroom Calendar: Math Puzzles (Grades K-12) Bring in a variety of puzzles, including math puzzles, puzzles that ask This is a model lesson on geometry and problem solving taken directly from http://www.enc.org/features/calendar/unit/0,1819,20,00.shtm

Skip Navigation You Are Here ENC Home ENC Features Classroom Calendar Search the Site More Options Don't lose access to ENC's web site! Beginning in August, goENC.com will showcase the best of ENC Online combined with useful new tools to save you time. Take action todaypurchase a school subscription through goENC.com Classroom Calendar By Category By Month ... Ask ENC Explore online lesson plans, student activities, and teacher learning tools. Find detailed information about thousands of materials for K-12 math and science. Read articles about inquiry, equity, and other key topics for educators and parents. Create your learning plan, read the standards, and find tips for getting grants. Math Puzzles (Grades K-12) November 21 Graphic: Andrew Ault National Game and Puzzle Week, November 20-26 Happy National Game and Puzzle Week! Celebrate the week by having students do some math-related puzzles. Although most of the puzzles here are for middle and high school students, there's something for everybody. Connections Puzzles provide a fun way for students to acquire and practice math skills such as problem solving, logic, recognizing patterns, and number sense. Here are a few ideas in celebration of puzzles:

106. Math Magic Problem of the Month Archive, math Magic is a web site devoted to original One of the bestknown recreational math puzzles of all time is finding a http://www.stetson.edu/~efriedma/mathmagic/

Problem of the Month Archive Math Magic is a web site devoted to original mathematical recreations. If you have a math puzzle, discovery, or observation, please e-mail me about it. You can also send answers to the problem of the month. Problem of the Month (September 2005) This month we consider 4 problems concerning squares. 1. Square Chain Tilings We say a tiling of a square by integer-sided squares is a square chain tiling if every square of side s>1 shares part of a side with a square of s-1. For each n, we are interested in finding the square chain tiling of a square of side n using the fewest number of squares. For example, the best known tilings for small squares are given below: Can you improve these tilings? What are the minimal square chain tilings for larger squares? In particular, what is the fewest number of squares you can find for a chain tiling of a square of side 100? What are the best chain tilings of rectangles by squares? How about equilateral triangle chain tilings? 2. Square Bridges

107. ElementaryEducation Resources-Math: Puzzles And Problem-solving Back to Elementary Ed. math Index. General puzzles and Problemsolving Resources About problem solving AIMS Puzzle-a-month page http://www.pitt.edu/~poole/eledmathPuzzles.html

Elementary Education Resources-Math: Puzzles and Problem-solving List of Contents (click on topic name for more links) General Puzzles and Problem-solving Resources (20) Back to Elementary Ed. Math Index General Puzzles and Problem-solving Resources About problem solving AIMS' Puzzle-a-month page Brainteasers Challenge yourself! Clever Games for Clever People Cool Math Dudes Math problems for middle school students Roller Coaster Madness design a Roller Coaster Figure this Math Challenges for families FunBrain.com providing teachers, parents, and kids with the tools they need to succeed Houghton-Mifflin Brain Teasers Full of mentally challenging and fun brain teasers How to solve problems Instant solutions to all types of math problems Interactive Math Puzzles Mathman Cookie Sharing Various cookie related problems for elementary grade students Mathman Fractions Fraction problems for elementary students Math Mystery MathsForFun.com free number puzzles to download and complete as well as a competition to enter every month. Challenging and fun Math Word Problems Methods to solve real world problems Puzzles with polyhedra and numbers print copies of polyhedron puzzles (for non-commercial purposes only) and read several mathematical articles on the subject Save the Solar System and learn Multiplication at the same time. As the pilot of a space ship far in the future, you must save the solar system from gravitational anomalies while learning and memorizing the multiplication table. This is a game Dan Perkins developed for his son to help him learn his tables.

108. LESSON PLANET - 30,000 Lessons And 1111 Web Sites For Math Puzzles LESSON PLANETSearch Results for keyword math puzzles. math Goodies Interactive math Lessons With A ProblemSolving Approach! http://www.lessonplanet.com/search/search?keywords=Math Puzzles&display=websites

109. EDUCATION PLANET - 1111 Web Sites For Math Puzzles DoYourmath.com * Entertaining math for all ages, math puzzles, Featured Games puzzles. click here to buy from Education Planet Store math Around The http://www.educationplanet.com/search/search/?keywords=Math Puzzles

110. ReferenceResources:MathandMathHelp mathematical Brain Teasers, mathematical Problem Solving, math Games, math Help. math puzzles Weekly math puzzles with solutions discussed at length http://www.kidinfo.com/Mathematics/Mathematics.html

Reference Resources: Mathematics Math Dictionary for Kids Math Dictionary An animated dictionary that explains over 400 math terms. Included are interactive activities, practice, and calculators Brain Teasers / Problem Solving/ Activities Brain Teasers Improve your problem solving skills with these brain teasers grade levels 3, 5-6, 7+ Brain Teasers and Puzzle Web Page Hundreds of brainteasers CyberKids Brain Teasers Graphic puzzles, memory games, word puzzles Interactive Mathematics Miscellany and Puzzles, Games Page A site devoted to mathematics, games, and puzzles Math Puzzles Weekly math puzzles with solutions discussed at length each following week;examples of past puzzles include: Chaos Tiles, Dissecting Convex Figures, Domino Games, Eternity Puzzle, Fair Dice, Diamonds, Leapers, Multistate Mazes, Parity, Pentagon Tiling, Philosopher Logic, Phonetic Alphabet and Word Play Geometry A Gallery of Interactive On-Line Geometry The activities will help you get a "hands-on" feel for some of the fundamental principles of geometry. Try them all to help understand theorems and proofs.

111. Math Puzzles Almost all puzzles were told to us by a computer/math genius Vlad Mitlin . This problem was recently published in MAA on line Crossing a Rickety Bridge http://www.math.utah.edu/~cherk/puzzles.html

Math puzzles Andrej's homepage Elena's homepage These puzzles do not require any mathematical knowledge, just logical reasoning. Check, how smart you are. If you cannot solve them, take it easy. Almost all puzzles were told to us by a computer/math genius Vlad Mitlin . Visit us again: we intend to place here new puzzles and the solutions. Please email us your comments and new puzzles: cherk@math.utah.edu. Enjoy! Andrej and Elena 1. Coins There are 12 coins. One of them is false; it weights differently. It is not known, if the false coin is heavier or lighter than the right coins. How to find the false coin by three weighs on a simple scale? Solution: Click here 2. Bridge crossing This problem was recently published in MAA on line: Crossing a Rickety Bridge at Night By Flashlight. A group of four people has to cross a bridge. It is dark, and they have to light the path with a flashlight. No more than two people can cross the bridge simultaneously, and the group has only one flashlight. It takes different time for the people in the group to cross the bridge: A nnie crosses the bridge in 1 minute

112. Ten Ways To Use Puzzles In Math Education After all, a puzzle is nothing but a problem that is fun to solve. Here are ten ways you can use puzzles in your math classrooms, with links to web http://www.scottkim.com/education/tenways.html

Ten Ways to Use Puzzles in Math Education Puzzles make math fun Chances are that you already use puzzles in your classroom. After all, a puzzle is nothing but a problem that is fun to solve. Primary level teachers commonly use puzzle manipulatives like tangrams to teach concepts like sahpe, fractions and area. Secondary and high school teachers often use puzzles to introduce concepts and spice up homework. College entrance exams and math competitions are mostly collections of puzzles. As a professional puzzle designer and math educator, I would like to see puzzles used more widely at all levels of math education. Here are ten ways you can use puzzles in your math classrooms, with links to web resources. Most of the products mentioned work with upper elementary through high school students. 1. Classroom Resource Rush Hour Hoppers , and Lunar Lockout from Binary Arts , each of which include a graded series of 40 puzzles. The Problem of the Week book and posters from Dale Seymour Publications (part of Pearson Learning) is a colorful collection of entertaining puzzles that you can hang on your wall. I plan to create similar puzzles on the web. Having students build puzzles themselves both saves money and involves them in a creative crafts activity.

113. PUZZLES. Can You Believe It? Hypnotic site for active minds and puzzle enthusiasts enjoy making and solving Geometric O power, SQuizzes online, math droodles, Geotemplet puzzle http://www.archimedes-lab.org/

Puzzling and Mental Activities Since 1997 Did you know!? Optical Illusions Custom Puzzles Teachers' Resource Curiosities ... Italiano TO OUR PUZZLE WEBSITE! Puzzles : problems or toys that are designed to test a person's knowledge or skill. Transl. rompicapo (it), (fr), rompecabezas (sp), Denksportaufgaben (ger), (por), breinbreker s (du), hlavolam (cz), ludi mathematici (lat). Dear visitor We believe that you came on this site because you love doing puzzles and brain teasers and that you enjoy wrestling with geometry problems we make up especially for you. You lucky folks, research says it's good for you; brain games and mental activities keep your brain young and active. Think about it: even though the brain comprises only about 2% of the total body weight, it receives 15-20% of the body's blood and oxygen supply. And that means a lot! The word 'Geometry' comes from Geometria (Greek , "earth" +

114. Millennium Prize Problems The seven problems proposed by the Clay Mathematics Institute P versus NP; Hodge Conjecture; Poincaré Conjecture; Riemann Hypothesis; YangMills Existence http://www.claymath.org/millennium/

Clay Mathematics Institute Dedicated to increasing and disseminating mathematical knowledge HOME ABOUT CMI PROGRAMS AWARDS ... PUBLICATIONS Millennium Problems In order to celebrate mathematics in the new millennium, The Clay Mathematics Institute of Cambridge, Massachusetts (CMI) has named seven Prize Problems . The Scientific Advisory Board of CMI selected these problems, focusing on important classic questions that have resisted solution over the years. The Board of Directors of CMI designated a $7 million prize fund for the solution to these problems, with $1 million allocated to each. During the Millennium Meeting The Importance of Mathematics , aimed for the general public, while John Tate and Michael Atiyah spoke on the problems. The CMI invited specialists to formulate each problem. One hundred years earlier, on August 8, 1900, David Hilbert delivered his famous lecture about open mathematical problems at the second International Congress of Mathematicians in Paris. This influenced our decision to announce the millennium problems as the central theme of a Paris meeting. The rules for the award of the prize have the endorsement of the CMI Scientific Advisory Board and the approval of the Directors. The members of these boards have the responsibility to preserve the nature, the integrity, and the spirit of this prize.

115. Missouri State University Problem Corner Links to Other Puzzle and Problem Pages Back to the math Department Homepage This page is maintained by Les Reid. Last updated 727-05. http://math.smsu.edu/~les/POTW.html

Missouri State University's Problem Corner Five Interlocking Tetrahedra, Welcome to the Missouri State University Department of Mathematics' Problem Corner. There are three levels of problems: High School, Advanced, and Challenge. A brief description of each follows; click on the link to go to the corresponding page. There are also archives of past problems. Problems are updated monthly (approximately). Solutions will appear approximately two months after the problems have been posted (to give everyone plenty of time to respond). HighSchool The problems on this page will be directed primarily towards high school students, although everyone is welcome to participate. Each month, the solution to the previous month's problem will be posted along with the names of those who have solved it. Archives Advanced This page will pose problems which assume some college-level mathematics, typically calculus, but occasionally higher-level courses. Solutions are solicited. Each month, the names of those solving the puzzle will be posted along with one of their solutions (assuming any are received). Archives Challenge This page does not presuppose a knowledge of calculus, but the problems posed tend to be of a more challenging nature. Solutions are solicited. Each month, the names of those solving the puzzle will be posted along with one of their solutions (assuming any are received).

116. Think Again! The puzzle consists in folding along the lines to make a 1x1 square where two of the three Axis leaders, Problem source Folding by Bryan Clair. http://simpler-solutions.net/pmachinefree/thinkagain/thinkagain.php

home welcome archive comments ... reflections Friday, 23 September, 2005 Overtaking safely You drive along a straight road with one car in front of you. You want to pass it, but in the distance you see an approaching car. Do you have enough time to make a safe overtaking? This math puzzle is solved daily by all drivers. Some solve it wrongly and end up hurting others and themselves. Which factors do you have to take into account? Do you have a rule of thumb or do you use your gut feeling based on experience? Make your assumptions and come up with a formula I can use next time I am on the road. Permalink Comments Trackbacks Pingbacks Quote My boyfriend keeps telling me I've got to own things. So, first I bought this car. And then he told me I oughta get a house. 'Why a house?' 'Well, you gotta have a place to park the car. - Julia Roberts Permalink Comments Trackbacks Pingbacks Thursday, 22 September, 2005 Green light means 'Go!' When was it decided that green means 'go' and red 'stop'? Can any reader enlighten me? A long row of cars are waiting for the light to turn green. When it does, how many can cross if the light stays green for 15 seconds? What about 30 seconds? Or, dare I ask, s seconds?

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