 The Syllogistic Machine  Johan Mårtensson
A JavaScript machine for checking the properties of Aristotelian syllogisms, with links to Mårtensson's OnLine Logic Book.
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 Symmetrier, monstre & tesselationer med The Geometer's Sketchpad  Allan Bergmann Jensen, Kalundborg, Denmark
GSP Symmetries, Patterns and Tessellations. Contains a gallery of wallpaper designs constructed using the Geometer's Sketchpad with JavaSketchpad versions to explore, an illustrated paper on "The Math About Symmetries" (in Danish), a GSP guide, a links
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 syzygymatrix: solutions for small problems in the classroom  Jeff LeMieux
Generate cryptograms, division worksheets, fraction worksheets, and proportion problems. Select the length of dividend, denominators specified by the Washington State Standards for Grade 7, number of problems, and more. The worksheet maker prints solutions.
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 Syzygy Shareware  Thomas C. Bretl
A source of math freeware for both Mac and PC, appropriate for grades K12. Includes games,
simulations, and skillbuilding programs. Explore, see in new ways, discover patterns, and solve
problems.
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 Table of numbers problem  Dario Alpern
Place the natural numbers between 1 and mn in a table of m rows by n columns, so that the sum of the addition of the products of the numbers that compose the rows plus the addition of the products of the numbers that compose the columns is as low as possible.
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 Taking 20 Percent Off  NASA Lewis Learning Technologies Project
If a $900 computer is on sale for 20 percent off, what is the sale price? A detailed answer is provided. From NASA's 9th Grade Math Proficiency Test.
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 Taking Games Seriously  Cut the Knot!, Alexander Bogomolny
In the twenty years since it first appeared, Winning Ways for Your Mathematical Plays had become a classic and a rarity. So did its companion book, On Numbers And Games, which was written in just about a week by one of the WW's authors and saw the light
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 Talking about Probability: A Study on Learning Probability Theory via a Dialogue System  Dr. Dietmar Janetzko
After an initial quiz, a "talking head" will present and discuss problems in probability theory. You don't
have to be an expert on probability theory to participate, though people with a background in that field may also enjoy asking questions of Dr.
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 Tangoes  Rex Games, Inc.
Based on the ancient Chinese Tangram puzzle, Tangoes is a learning tool that combines artistic and mathematical elements to enhance visual perception ability, develop problem solving skills, and encourage creative thinking capacity and teamwork. Tangoes
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 Tangrams  J. L. Read; Enchanted Mind
A tangram applet that allows you to rearrange the seven forms to exactly reproduce the given image. To move the pieces, drag them with the mouse. To rotate pieces, click with the right mouse button or (on the Mac with a onebutton mouse) click while holding
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 Taxicab Geometry/La Géométrie des Taxis  Pascal Tesson
A term project for a Pattern Recognition course given by Godfried Toussaint at McGill University. Other student projects from 1997, 1998 and from a Computational Geometry course are also available. Contents: What is Taxicab Geometry? Why Taxicab Geometry?
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 Teachers' Lab  Annenberg Media
Labs based on professional development series and workshops broadcast on the Annenberg/CPB Math and Science Project Channel. Each combines online activities with background information and interactive polls or worksheets for use in classrooms, with links
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 Teaching Introductory Statistics in the Social Sciences and Engineering (Mathematics Across the Curriculum)  Dartmouth College
A course that brings together faculty from many different departments who collaborate to produce instructional modules that can be used interchangeably in different introductory courses in statistics, and which integrate the most current technology available
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 Teaching Materials (Mathematics Archives)  University of Tennessee, Knoxville (UTK)
Links to collections of: Calculus Resources Online; Emerging Scholars Program; Graphing Calculators; JAVA and Other Interactive WWW Pages; Lessons, Tutorials and Lecture Notes; Mathematics and the Liberal Arts; Sites Dedicated to the Teaching of Collegiate
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 Teaching Pets  Andy Davis
See the math resources section of this collection of worksheets and related resources for the primary and middle grades teachers.
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 Teaching Resources Online  Bert G. Wachsmuth
Seton Hall University professor's syllabi, online handouts, sample programs, scripts and software to download, exams and answers, general information, and other teaching resources for his computer science and mathematics courses: Intro to Computer Science,
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 Teaching Time  Mark Cogan
A resource for teaching time. The site includes an interactive clock as well as online games and innovative worksheets.
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 TeachMeWell.com  TeachMeWell, Inc.
TeachMeWell.com provides online math help for children ages 5 to 10 or in grades 1, 2, 3, 4 or 5, covering basic math problems with an emphasis on speed and accuracy. Full details and pricing options are available on the site.
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 TeAchnology  Teachnology, Inc.
A portal for information about current and past practice in the field of education. Read math teaching "Ideas That Worked"; and tutorials ranging from teacher retirement planning and "What to Consider When Writing a Lesson Plan" to "How to Deal With Disruptive
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 Teach R Kids Math  Manri Systems
Math for elementary school children: online and offline math assignments and worksheets, ranging from simple counting for preschoolers to division and multiplication problems, and calendar and clock exercises for learning to tell time.
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 Team Umizoomi  Viacom International Inc.
Milli, Geo, and Bot solve everyday math problems with their "Umifriend" preschoolers. Get Mighty Math crafts, games, printables, and recipes. Download episodes of this animated liveaction series broadcast on Nickelodeon's Nick Jr. television show.
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 Technologies: Past and Future  Cut the Knot!, Alexander Bogomolny, with Don Greenwell
A discussion of the similarities in browsing through books and surfing the Internet, the serendipitous discoveries that can be made, fallacious geometric and other puzzles, and an interesting integer matrix, with recommendations of books to read and sites
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 Technology PoWs  Math Forum
Challenges modeled on the Forum's Problems of the Week (PoWs) that take advantage of interactive mathematics tools. Students are invited to follow the link to "Submit your answer" to share their solutions, and then "selfmentor" using specially designed
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 TenMarks  TenMarks Education Inc.
View math curricula "albums" by grade and state, with hints and video instructions on demand. Teachers may monitor, assign, and review their students' work.
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 Terry McConnell's Home Page  Terry McConnell, Mathematics Department, Syracuse University
Download PDFs of tests given in McConnell's introductory calculus, Math 295. "Stuff" ranges from a remark on average velocity and an expository paper showing the details of how to derive the second order correction to the period of a plane pendulum using
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 Tessellation Tutorials  Suzanne Alejandre
A series of tutorials that teach students how to tessellate (somewhat in the style of the art of M.C. Escher) using HyperCard for black and white and/or HyperStudio for color, ClarisWorks, LogoWriter, templates, or simple straightedge and compass. The
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 The Tesseract  Cut the Knot!, Alexander Bogomolny, with Don Greenwell
A hypercube is a multidimensional analogue of a 3dimensional cube in that each coordinate of a point in a hypercube is restricted to the same 1dimensional (line) segment. The Tesseract is a 4dimensional hypercube. With an applet designed to demonstrate
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 Testing Applets  Philippe B. Laval, Kennesaw State University
Applets categorized into regression, linear functions, quadratic functions, exponential functions, trigonometric functions, differentiation, integration, and graphing and other applets.
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 Test Prep Review  Testprepreview.com
As the title of this site indicates, there are materials to help users review in preparation to take a variety of tests, including the GRE, SAT, ACT, and Praxis. Under each of the free practice test areas, there are selfassessment modules with a set
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 TestTubeGames  Andy Hall
Apps, Flash games, and simulations by "an escaped physics grad turned educator.... following his dream to make abstract physics concrete. And draw dinosaurs." Explore special relativity with Velocity Raptor, orbits and chaos with Gravity Sim, particle
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 ThatQuiz  Andrew Lyczak
Practice integer and fraction arithmetic, inequalities, averages, exponents, factors, algebra, calculus, shapes, probability, place value, graphs, sets, trigonometry, and more. The site times and scores performance. Register for online administration
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 That's Mathematics!  Nate Eldredge
A mathematician's collection of "various sparetime projects." Blog posts of "diversions, distractions, and math," which date back to June, 2012, focus on Mathgen, Eldredge's perl program that uses contextfree grammar, LaTeX, and BibTeX to randomly generate
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 themathlab.com
Playful, interactive studentmade problems, games, drills, lesson ideas, tools, "magic," and more. Lessons include practice problems which, when solved correctly, generate passwords that grant access to "treasure rooms." Lesson ideas include Algebachee
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 TheMathPage: Skill in Arithmetic  Lawrence Spector; Borough of Manhattan Community College, CUNY
A complete course in arithmetic: reading and writing whole numbers and decimals; addition, subtraction, multiplication, and division. Features the verbal, nonalgebraic theory of ratio and proportion, leading to fractions and percent. The usual written
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 TheMathWebSite.com: aMath Teacher's Best Friend  TheMathWebSite.com
Provides high school math lesson examples, quizzes and tests complete with solution steps and final answers. Primarily for use as printable class sheets. Requires Internet Explorer, frames, Java, and JavaScript.
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 Theoretical Learning  Peter Moxhay
Information about a pilot project in Portland, Maine, public schools to adapt an approach developed in Russia for early math education (grades 13). Includes contact forms and request forms for Portland area parents to download trial math applets for
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 TheXorb  Jagan Deb
Online calculators for the slope and yintercept of linear equations; standard deviations; mean, mode, and range; the Pythagorean Theorem; and properties of geometric figures such as triangles, squares, circles (circumference given area; area given diameter;
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 A Thing In Common  Cut the Knot!, Alexander Bogomolny
Two applets, both of which use the Pythagorean theorem: a puzzle (Draw an {N/D} star polygon  a polygon whose N vertices are uniformly distributed on a circle, but each vertex is connected to its Dth neighbor. Regular polygons correspond to D = 1, and
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 Things I Made From Yarn  Alan Eliasen
Futureboy's online calculators include a blackjack strategy table, a model solar system calculator (create your own model solar system of any scale), a sun locator (find current position of the sun), a historical currency converter (find out "how much
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 Things Impossible  Interactive Mathematics Miscellany and Puzzles, Alexander Bogomolny
Essays on impossible things, including trisecting an angle, doubling a cube, squaring a circle, moving pegs five places in one direction (via checkerjumps), finding the center of a given circle with the straightedge alone, representing the square root
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 Thinkfinity  Verizon Foundation
Browse lesson plans by state or search them for keywords. Educational resources developed by Thinkfinity or by partners such as NCTM include interactive games, news, videos, webinars, worksheets, and calendars of birthdays and biographies.
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 ThinkFun  ThinkFun, Inc.
The makers of Spin Out and Rush Hour seek to "push [you] farther, probe deeper and think more creatively through game play." Brainteaser games include Math Dice, which challenges you to use addition, subtraction, multiplication, division, and exponents
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 Thinking Blocks  Colleen King, Math Advantage Learning Center
Thinking Blocks teaches students to visualize and model math word problems. The program features interactive exercises, video instruction, and independent practice, all online.
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 ThinkNum  Gregory Ugwi
A webbased financial data analysis engine. Use regression, curve trades, and other quantitative trading algorithms from scipy, numpy, and similar open source libraries to analyze economic information from hundreds of sources ranging from the ADO National
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 Thorleif's SOMA page  Thorleif Bundgard, Denmark
Over a thousand figures for these cubes: standard figures (176, all solved); McFarrens figure set (798, all possible); and more. An index of all figures is available. With some SOMA history and a link to a newsletter.
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 Three Dimensional Graphing Applet  James Goodenberger
A Java applet with which to graph first degree equations with three variables (planes) in three dimensions. The graph can be rotated and zoomed in or out of, but it won't graph a plane that passes through the origin.
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 The Three Jugs Problem  Cut the Knot!, Alexander Bogomolny
Two friends who have an eightquart jug of water wish to share it evenly. They also have two empty jars, one holding five quarts, the other three. How can they each measure exactly 4 quarts of water? ... The description of the 3 Jugs problem as a triple
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 Time4Learning  John Edelson, Founder
An online homebased learning system with multimedia lessons, interactive exercises, printable worksheets, assessments and quizzes for use in homeschool, tutoring, or summer programs. See, in particular, their Homeschool Math Curriculum. Sample lesson
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 Time Math  Education 4 Kids, Inc.
Time, at different levels of complexity (clock and calendar). You are presented with two times (in one of the formats selected) and asked to determine the difference between the two.
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 Time: Minutes and Hours  NASA Lewis Learning Technologies Project
Roberta left for her dancing class at 3:45 p.m. Her dancing school is a 15 minute walk from her house, and her class lasted one and one half hours. What time did she get home if she went straight home? A detailed answer is provided. From NASA's 9th Grade
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