- thnik again! - Jan Nordgreen
"Silly mathematical dialogues aimed to confuse." Nordgreen's daily blog of brain teasers and quotes dates back to November, 2007.
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- Three Common Graphs - Math Forum, Ask Dr. Math Common Question
A selection of answers to questions about three common graphs: bar graphs, histograms, and pictograms.
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- Through the Glass Wall: Computer Games for Mathematical Empowerment (TERC) - Testbed for Collaboration, Eisenhower Regional Consortia
An NSF-funded research project that has spent two years looking at how girls and boys play mathematical computer games in order to consider and describe what makes a good mathematical and equitable computer game. The site provides descriptions of over
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- Time Engineers - Software Kids
A CD-ROM game of interactive, open-ended engineering problems to solve by using math and science skills, designed to help middle and high school students explore and apply some of the fundamental principles of engineering. Time Engineers encourages trial-and-error
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- Time Zonese - Math Forum, Ask Dr. Math Common Question
A selection of answers to questions about time zones, how they work, and why the former USSR have 11 time zones, while China has only one.
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- Toads And Frogs Puzzle - Interactive Mathematics Miscellany and Puzzles, Alexander Bogomolny
An interactive exploration of the Toads and Frogs puzzle, also known as Hares and Tortoise; Sheep and Goats; Hop, Skip, Jump; and Traffic Jam.
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- Tournament of Towns - Math Net, University of Toronto
A worldwide problem solving competition in mathematics. The contest attracts students of all mathematical interests and abilities with its inclusive rules and creative problems -- some as challenging as those of the International Mathematical Olympiad.
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- Tournament Scheduling - Math Forum, Ask Dr. Math Common Question
A selection of answers to questions about scheduling tournaments, from "Can you help me construct a schedule for a round robin style junior hockey tournament with two divisions using only four fields?" to "What are the odds of one person predicting the
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- Triangle Congruence - Math Forum, Ask Dr. Math Common Question
A selection of answers to questions about triangle congruences, such as "Why can't the SSA Theorem be used to prove congruence?" and "When should we use Congruent Parts Congruent Triangles Congruent (CPCTC), and how does it prove anything?"
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- Twos Complement - Math Forum, Ask Dr. Math Common Question
A selection of answers to questions about two's complement, a way to encode negative numbers into ordinary binary so that addition still works.
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- UBUYACAR - Maricopa Center for Learning and Instruction
An online problem-based learning manual for students that poses the question: "You are interested in purchasing a new vehicle. What should your annual salary be to afford the car you want?" Students move through a problem-solving process. A Tutor's Manual
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- Unit Conversions, Unit Cancellation - Math Forum, Ask Dr. Math Common Question
A selection of answers to questions about unit conversions and cancellations, from "Convert: 3.25 cm to millimeters...." to "If you can run 100 meters in 10 seconds, how long, in days, hours, and minutes, does it take you to run 12,800,000 meters?"
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- UVM High School Math Contest - Larry Kost, University of Vermont College of Engineering & Mathematics
Tests, with solutions, from contests dating back to the forty-fifth annual high school prize examination, of 2002. The tests consist of about forty questions encompassing number theory, algebra, and geometry. Also, lists of statewide and regional winners,
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- Vectors - Math Forum, Ask Dr. Math Common Question
A selection of answers to questions about vectors, sums of vectors, angles between vectors, and vector spaces, such as "A river flows westward at 8 m/s. A person wants to go directly across the river so that the resultant velocity is 12 m/s northward...."
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- Venn Diagrams - Math Forum, Ask Dr. Math Common Question
A selection of answers to questions about Venn diagrams and using them to model sets, intersections, and unions.
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- Villainy, Inc.: Thwarting World Supremacy through Mathematics - Maryland Public Television
To thwart the evil Dr. Wick, ID, middle grade students take on the role of an advisor to his company, Villainy, Inc. -- while secretly using their math skills to make sure Wick never succeeds. As undercover double agents for the Anti-Villainy Unit (the
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- The Virtual High School
The Virtual High School project is a collaborative of high schools from around the country. In exchange for contributing a small amount of teaching time, a school in the collaborative can offer its students web-based courses ranging from advanced academic
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- Volume of a Tank - Math Forum, Ask Dr. Math Common Question
A selection of answers to questions about finding the volume of cylinders, cones, oblate spheroids, and other tanks, such as "How can I calculate volume of liquid in a cylinder that's not full and lying horizontally?"
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- Was Math Invented or Discovered? - Math Forum, Ask Dr. Math Common Question
A selection of answers to questions about whether math was invented or discovered.
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- Weighing a Counterfeit Coin - Math Forum, Ask Dr. Math Common Question
A selection of answers to questions about using a balance beam to find a counterfeit coin, such as "If there are twelve coins in a bag, one of which is either lighter or heavier than the others, find the fake coin in exactly 3 weighings and determine
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- Weighted Averages - Math Forum, Ask Dr. Math Common Question
A selection of answers to questions about weighted averages, where some data have greater value than others, such as determining a final grade from three tests worth a total of 45% of the final grade, a final exam worth 25%, a project worth 15%, and three
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- The West Point Bridge Design Contest - United States Military Academy, West Point, New York
A challenge for U.S. students age 13 through grade 12. The purpose of the contest is to provide middle school and high school students with a realistic, engaging introduction to engineering. Learn about how engineers use the computer as a problem-solving
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- What Color Is My Hat? - Math Forum, Ask Dr. Math Common Question
A selection of answers to questions about which person wears which hat, such as "Three students close their eyes, and the teacher puts a hat on each of their heads (hiding the other two hats)...."
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- What is 1+1? - Math Forum, Ask Dr. Math Common Question
A selection of answers to questions about what 1+1 is in decimal and binary, how to prove it with Peanos Postulates, as well as a false proof that 1 + 1 = 1.
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- What is Mathematics? - Math Forum, Ask Dr. Math Common Question
A selection of answers to questions about what mathematics is, such as "Is math a science, an art, or some other anomaly?" and "Is there a difference between arithmetic and mathematics, and what is it?" and "Is math a science or an art?"
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- What is Mod? - Math Forum, Ask Dr. Math Common Question
A selection of answers to questions about modular arithmetic, including the method of casting out nines.
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- Which One Is Older? (Math Chat) - Frank Morgan, MAA Online
Creative solutions to the challenge: how can two people determine which is older without revealing their ages? Math videos available from the Mathematical Sciences Research Institute via the MAA. "Mathematics in Arcadia," "Fermat's Last Theorem," as seen
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- Wired Math - Dean Murray, Soo Go, Jamie Pearson; University of Waterloo (Canada)
A free website created for students and teachers by a teacher for the University of Waterloo. The online games, drills, "follow up exercises," and answers
address topics common to middle grades on every continent. Also availalble from http://www.wiredmath.ca/
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- Word Problems for Kids - St. Francis Xavier University; Canada's SchoolNet
Word problems by level for students in grades 5-12, which can help improve problem-solving skills. A hints link is available for difficult problems. Complete solutions are available upon request to teachers with e-mail addresses. From students, principals,
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- Working Together - Math Forum, a Classic Problem from the Ask Dr. Math FAQ
Jack can paint a house in 5 days, and Richard can paint the same house in 7 days. Working together, how long will it take them to finish the job?
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- Workshops - ActiveMath, Inc.
Full-day, hands-on workshops for teachers of grades 3-12, generally held on Saturdays in the Chicago area and designed to take math out of the classroom. Workshops include Math at the Field Museum, Math at the Art Institute of Chicago, Math & Gaming
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- The World of Trotter Math - Terry Trotter, Escuela Americana, San Salvador, El Salvador
A page of problems, problem sheets, and investigations, with links to image files of an in-class math newsletter, Trotter Math News. Of particular interest to the author are numbers: happy and dizzy numbers; palindromes; super squares; perfect, amicable,
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- Writing to Develop Understanding: The Math Forum @ Drexel's PoWs - Suzanne
What can we ask students about their problem solving that will help them the most? This article, originally published in the December, 2006, issue of the CMC ComMuniCator, journal of the California Mathematics Council, addresses that question by examining
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- www.GREGTANG.com - Greg Tang
Educational materials that combine problem-solving and arithmetic, and integrate math with language and art, from the author of The Grapes of Math, Math For All Seasons, The Best of Times, Math Appeal, Math-terpieces, Math Fables, and Math Potatoes. In
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- xyAlgebra - John C. Miller, The City College of The City University of New York
Download xyAlgebra for interactive instruction and practice in algebra, or xySolver for interactive instruction and practice in verbal problems. These two student programs include explanations of principles of basic algebra, step-by-step sample problems,
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