 Tiling: A Java Program for Exploring Plane Tilings  Tom White
A Java application for experimenting with tilings and tessellations through scripting. Construct tilings interactively using a mouse  "like doing a jigsaw." Alhambra comes with many tile shapes already supplied; the site offers images created from the
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 Tiling Plane and Fancy  Steve Edwards
The 17 wallpaper groups identify the plane symmetry groups and link to background patterns illustrating them. Tiling Definitions define, with examples, the terms fundamental region, isohedral tiling (isohedral and nonisohedral), isogonal tiling, lattice,
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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 Engineers  Ray Shingler, Clay Schultz, and David Bielat
In this video game, middle and high school students explore and apply fundamental principles of engineering by traveling in a time machine to build pyramids, irrigate farm land, steer a submarine, raise and lower medieval drawbridges, operate radar, launch
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 Time Engineers  Software Kids
A CDROM game of interactive, openended 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 trialanderror
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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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 The TIME Project (Technology in Math Education)  Harding University
At this website, middle level and secondary mathematics teachers can locate lesson plans, activities, and a list of websites that can serve as resources for mathematics teachers and learners.
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 Time [sci.astro] (Astronomy Frequently Asked Questions)  Joseph Lazio
sci.astro is a newsgroup devoted to the discussion of the science of astronomy. This document summarize answers to questions that appear fairly regularly: Time, Calendars, and Terrestrial Phenomena; When is 02/01/04? or is there a standard way of writing
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 Time (SMILE)  Gracie Davenport, Spalding School
A lesson designed to teach physically Handicapped (EMH) students to tell time using a number chart; to demonstrate their ability to tell time by using a clock; and to use this skill to follow a daily schedule. From the Practical and Applied Math section
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 Times Tales  Trigger Memory Systems
Memorization system for the upper multiplication facts (6, 7, 8, 9 times tables). Uses visual mnemonics.
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 Time, The Fourth Dimension  Jim Loy
Because of Einstein, we often call time the fourth dimension. Special relativity shows that time behaves surprisingly like the three spatial dimensions... Pretend, for a moment, that there are more than three spatial dimensions. What is a four or fivedimensional
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 Time to Set the Hook  John Stevens
A site dedicated to helping other teachers "set the hook with technology. It might be a video that demonstrates your standard being applied in a real life setting. It might be a screencast of a stepbystep solution to a problem. It might be a blog that
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 Timez Attack  Big Brainz
An actionfilled educational video game that teaches multiplication facts using graphics, sound, and animation comparable to mainstream games. Download the base version free; demo the licensed version; take a video tour; read reviews and testimonials.
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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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 TI Middle Grades  Texas Instruments, Inc. (TI)
Online resources specifically for middle grades educators. Includes: classroomready math for your lesson plans; professional development and TI technology training opportunities; and tutorials for the TI73 Explorer and TI84 Plus family of graphing
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 Timothy Kasper
Screencast geometry lessons, most less than five minutes long, narrated by a seventh grade teacher in Indiana.
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 Tim's Interactive Puzzle Solution Center  Alex Sakharov
A growing collection of interactive online logic puzzles including Cannibals and Missionaries, Eight Queens, Gunport, and math puzzles of various difficulty levels.
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 TIMSS Brochure  Math Forum
Basic information about the Third International Mathematics and Science Study (TIMSS).
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 TIMSS Math and Science Challenge: Sample Test  EdInformatics.com
Several sample TIMSS Math Tests using original questions from the three released sets (Pop1,2,3). Tests are graded online and can be compared both to the international scores and to scores of other students who have taken the test online.
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 TIMSS Resource Center  Midcontinent Regional Educational Laboratory (McREL)
Articles, teleconferences, sites, and other materials about the Third International Mathematics and Science Study.
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 TIMSS United States: International Mathematics and Science Study  U.S. TIMSS National Research Center, Michigan State University
The Third International Mathematics and Science Study represents the most extensive investigation of mathematics and science education ever conducted. Approximately 50 countries participated in this comparative survey of education focusing upon 9yearold
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 Tim's Triangular Page  Alex Sakharov
Information, definitions, and illustrations of triangles, their parts, and congruency. Includes a few min/max problems relating to triangles at the end.
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 TinkerPlots™ Workshop Guide  Key Curriculum Press
TinkerPlots is software for dynamic data exploration and analysis which has been fieldtested with math classes grades 48. The free 72 page guide is meant to be used in a workshop setting, where participants can work together and a workshop leader can
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 Title III MSS Final Performance Report  Dana Lee Ling
Dana Lee Ling is a mathematics and science software specialist at the College of MicronesiaFSM. Articles document the College's attempts to increase the success of prealgebra and algebra students through "conceptual" and technologybased approaches.
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 TI Wizard  Andrew Munsell
News, software, and tutorials for Texas Instruments calculators. Download board games, roleplaying games (RPGs), racing and driving games, shooter games, games of strategy, platforms, shells, puzzles, and more. Stepbystep Flash tutorials include "Transferring
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 TLC  The Learning Company  Broderbund
Search for math to find product names (Reader Rabbit, Schoolhouse RockMath Rock, and more).
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 Toads And Frogs Puzzle in 2D  Interactive Mathematics Miscellany and Puzzles, Alexander Bogomolny
A 2dimensional Frogs and Toads puzzle that is not much more complicated than its 1dimensional analogue, provided, of course, the latter is fully understood. Java applet.
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 TODOS: Mathematics for All  Miriam Leiva, President
An organization designed to advocate for an equitable and highquality mathematics education for all students, in particular Latino/Hispanic students, by advancing the professional growth and equity awareness of educators. TODOS publishes Teaching for
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 Tom Snyder Productions
Software for teachers who love to teach. Company information, free demos, catalog; free CD sampler; product descriptions, online classroom activities, professional development (including public seminars and onsite workshops), Technology Newsletter, and
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 Tools for the Common Core Standards  Bill McCallum
News about tools that support implementation of the Common Core State Standards (CCSS). Posts, which date back to January, 2011, have included "Draft of progression on Number and Operations in Base Ten," "Task Writing Contest 5 for Illustrative Mathematics,"
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 Toothpick Puzzle: a Math Line Puzzle  Math Forum
Starting with the configuration shown, move exactly two toothpicks to form four 1x1 squares. You must use all the toothpicks, without any overlap. The final product will consist of exactly four squares, all the same size as the five in the original configuration.
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 Top 100 Mathematics Software  Adam Testad, Kuala Lumpur, Malaysia
A top 100 list of mathematics software: shareware, freeware, payware, some hardware, and some Web sites. A selection from over 24,000 products with references to download sites, suppliers page, and PC literature references.
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 Top Grade Tutoring  Steven Britton
Top Grade Tutoring provides maths tuition for students aged between 1116 in the Halesowen, Stourbridge, and Hagley areas of the West Midlands, UK.
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 Topics in Arithmetic and Elementary Mathematics  E. Lee Lady; University of Hawaii
Materials used in a university course for prospective elementary school teachers, to teach them how to be interested in mathematics. Materials are in PDF and DVI, and include: representing numbers in other bases, divisibility tests, periodic decimal expansions,
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 Topics in Mathematical Recreations
Arithmetic and geometric puzzles; polyhedra; fractals and chaos; board and positional puzzles; pi and its calculations, and tiling patterns, which can be thought of as making an infinite polyhedron. Includes a bibliography ranging from Abbott's Flatland
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 Topology and Geometry Software: Fun and Games  Jeff Weeks
Fun math toys for all ages, from the author of Exploring the Shape of Space (grades 610) and The Shape of Space (grades 1216). Applets and software for various platforms. Play with tictactoe, mazes, and the like, on a torus or Klein bottle. Draw
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 Topology (Geometry and the Imagination)  Conway, Doyle, Gilman, Thurston; The Geometry Center
Topology is the theory of shapes that are allowed to stretch, compress, flex and bend, but without tearing or gluing. For example, a square is topologically equivalent to a circle, since a square can be continously deformed into a circle. As another example,
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 TopSecretMath.org  Donald Endriss
Stepbystep JavaScript tutorials for learning how to factor several different kinds of trinomials using the CAB method.
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 Tostaky.Biz  Jerome Verstrynge
JavaScript utilities formatted for the smaller screens of tablets and smartphones: timer, stopwatch, world clocks, and other timekeeping tools; and unit converters for area, force, length, torque, weight, and more.
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 Totally Tessellated  Bhushan, Kay, & Williams
A comprehensive introduction to tessellations and tilings  the basic underlying mathematics and examples of tessellations in real life. The highly illustrated, printerfriendly site includes history (tessellations in mathematics and science, decorative
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Tour: M.C. Escher  Life and Work  National Gallery of Art, Washington, DC
A tour of four virtual rooms devoted to the art of M. C. Escher. For each graphic a larger picture with accompanying commentary is available by clicking on a small picture. The gallery has more than 400 works by Escher with many images available online.
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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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 A Tour of Fractions  Math Forum
The Web often seems more like a maze than an organized set of resources. To help you find what you need, the Math Forum presents a 'tour' of fractions, offering links to lessons, activities, and materials, questions and answers from Ask Dr. Math, and
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 Tous pour les mathématiques au collège  David Monbru
Courses mathématiques de niveaux sixième, cinquième, quatrième, et troisième. Exercises avec autovalidation incluent calculs avec ou sans parenthèses; calculs de fractions; opérations sur les nombres relatifs;
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 The Tower of Hanoi  Andrew Cumming
Interactive version of the famous logic puzzle, in html and VRML versions, with a separate page about solving it.
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 Tower of Hanoi  Math Forum, a Classic Problem from the Ask Dr. Math FAQ
There are three posts. Disks of different sizes are placed on the lefthand post, arranged by size with the smallest on top. You are to transfer all the disks to the righthand post in the fewest possible moves, without ever placing a larger disk on a smaller
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 Tower of Hanoi on the Web  Miroslav Kolar
The legend: A group of Eastern monks are the keepers of three towers on which sit 64 golden rings. Originally all 64 rings were stacked on one tower with each ring smaller than the one beneath. The monks are to move the rings from this first tower to
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 Tower of Hanoi (SMILE)  Paul Eubanks, Washington High School
A lesson for grades 612 designed to teach students to discover a pattern and to evaluate an exponential expression. From the Patterns and Logic section of a collection of almost 200 single concept lessons by the Science and Mathematics Initiative for
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 Toys from Trash  Arvind Gupta
Stepbystep photographic instructions for building elegantly simple, colorful "Math Magic" doityourself manipulatives: Abacus, Flexagon, Triangle Grid, Flat Flexagon, Slipper Insets, Folding Pentagon, Tangram, Paper Octagon, Cylinder and Cone, Area
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