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  1. 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. ...more>>

  2. 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 ...more>>

  3. 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. ...more>>

  4. Thinking Fountain - Science Museum of Minnesota
    Thinking Fountain offers surprising and personal connections to science. It's a living card file full of ideas and activities. Includes the opportunity to add your own projects. See Shapes Cluster: Shapes & Math: Shape Walk, I C Shapes, Bubble Geometry, ...more>>

  5. Thinking Fountain Shape Cluster - Science Museum of Minnesota
    Activities, images, and experiments relating science, math, and language arts. The shapes and math cluster features shape walk, I C shapes (finding circles, squares, and triangles in everyday objects), soap bubble geometry, pyramids and cubes (building ...more>>

  6. Thinking Mathematically - Mark Chubb
    Blog by a teacher and instructional coach in Canada. Posts, which date back to June, 2016, have included "Purposeful Practice: Happy Numbers"; "Concept vs Procedure: An anecdote about what it means to be good at math"; "Never Skip the Closing of the Lesson"; ...more>>

  7. Thinking Mathematics! - James Tanton
    Tanton writes wordless volumes of creative and surprising math puzzles, accessible approaches to calculus suitable for standardized test preparation, and curriculum "tidbits." Download his free guides to fractions and "to everything quadratic," and watch ...more>>

  8. Think Maths - Matt Parker
    This group of mathematics speakers visits schools to perform maths talks and workshops in the UK. Sessions present math in ways that "grab the attention of students and remind them that maths is something to be enjoyed." Free downloads include domino ...more>>

  9. ThinkNum - Gregory Ugwi
    A web-based 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 ...more>>

  10. ThinkQuest
    An international contest designed to encourage students from different schools and different backgrounds to work together in teams toward creating valuable educational tools on the Internet while enhancing their ability to communicate and cooperate in ...more>>

  11. ThinkThankThunk - Shawn Cornally
    Blog by an Iowa headmaster and teacher of science, technology, engineering, and math (STEM). See, in particular, Cornally's collection of posts on Standards-Based Grading (SBG) and ongoing series on Honors Calculus course lessons, titled "Calculus: A ...more>>

  12. Think Through Math - Imagine Learning Inc.
    Adaptive, differentiated curriculum to prepare students in third grade math through Algebra I classes prepare for the Common Core State Standards (CCSS). Watch Think Through Math (TTM) videos, request a demo, and more. ...more>>

  13. ThinkWave.com
    A free web community that provides secure internet-based communication for parents, students, and teachers: real-time information about attendance, assignments, grades, and school curriculum. ...more>>

  14. Third Apex to Fractovia - Juan Luis Martínez
    Several galleries, each with up to 18 fractal images, and discussions on fractals as art. Also an up-to-date list of freeware fractal generators, screen savers, and fractal music software, with links and reviews. ...more>>

  15. Third Grade (AAA Math) - John Banfill
    Interactive math exercises, lessons, and games covering basic math concepts and methods, for third grade. ...more>>

  16. Third International Mathematics and Science Study (TIMSS) - Initial Findings - National Center for Education Statistics (NCES)
    Highlights from TIMSS; videotape classroom study report and classroom study; responses; the Commissioner's speech; results at the fourth-, eighth-, and twelfth-grade levels; test items, an annotated TIMSS publication list, and more. See also the 1999 ...more>>

  17. Third International Mathematics and Science Study (TIMSS) - Math Forum
    The Math Forum's page of resources on the TIMSS study. Initial findings, NCTM response, and more. ...more>>

  18. This is MegaMathematics! (MegaMath) - Nancy Casey; Los Alamos National Laboratory
    The frontier of mathematics is an exciting place, where mathematicians experiment and play with creative and imaginative ideas, many of them accessible to young children; others (infinity is a good example) whose profound mathematical importance is not ...more>>

  19. This Is Statistics - American Statistical Association
    Why study statistics? For students as well as their parents, teachers, and counselors, the American Statistical Association (ASA) provides a host of motives: to make a difference, have fun, satisfy curiosity, and make money, among other reasons. "Which ...more>>

  20. thnik again! - Jan Nordgreen
    "Silly mathematical dialogues aimed to confuse." Nordgreen's daily blog of brain teasers and quotes dates back to November, 2007. ...more>>

  21. Thomas Harriot's manuscripts - MacTutor Math History Archives
    Linked essay: Thomas Harriot died in 1621. He had published no mathematical or astronomical works during his lifetime, but he left his papers in reasonably good order and set out his wishes in his will that they should be properly edited and published. ...more>>

  22. Thom's Fractals
    A collection of fractal creations: images and wallpaper tiles, and links. ...more>>

  23. 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. ...more>>

  24. Those Amazing Flying Mathematicians - Keith Devlin (Devlin's Angle)
    October is the month when those of us living in the United States see migrating birds moving south for the winter. How do they know which direction to fly?... Assuming that the average bird is not the mathematical equivalent of a college math major, how ...more>>

  25. ThoughtBox - ThoughtBox Limited
    Makers of Numerosity, the "gameful learning" arithmetic app for the iPad. Also available from thoughtbox.co and thoughtboxlearning.com. ...more>>

  26. 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. ...more>>

  27. Three-dimensional Geometry (The Geometry Junkyard) - David Eppstein, Theory Group, ICS, UC Irvine
    An extensive annotated list of links to material on three-dimensional geometry. ...more>>

  28. 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. ...more>>

  29. Three Door Puzzle - Sky Coyote
    In interactive page with an explanation of this classic, controversial problem, sometimes referred to as "Monty's Dilemma" or the "Game Show Problem." Links to a game simulation, the answer to problem, and an N-door generalization are provided. ...more>>

  30. Three for the Money: The Degree/Diameter Problem (MegaMath) - Nancy Casey; Los Alamos National Laboratory
    Students can understand and work on an unsolved problem in mathematics. There is a good chance that this problem can be solved by someone who spends enough time experimenting with it. The only skills required to work on it are the ability to draw dots ...more>>

  31. Three Houses, Three Utilities - Math Forum, a Classic Problem from the Ask Dr. Math FAQ
    You are to draw a line from each house to each utility, without the lines ever crossing. Can you connect the houses to the utilities? ...more>>

  32. The Three Jugs Problem - Cut the Knot!, Alexander Bogomolny
    Two friends who have an eight-quart 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 ...more>>

  33. Three Skills For Algebra - Alan Selby
    This book describes three skills key to the algebraic way of writing and thinking, offering a first image of mathematics beyond arithmetic. It also describes the first elements of logic or rule-based reason, needed in all disciplines for writing or a ...more>>

  34. Three Years Of Computing: Final Report on the Palindrome Quest - John Walker
    "Pick a number. Reverse its digits and add the resulting number to the original number. If the result isn't a palindrome, repeat the process. Do all numbers in base 10 eventually become palindromes through this process? Nobody knows." The story of a ...more>>

  35. Three Years of Computing: Final Report On The Palindrome Quest - John Walker
    A 1990 report on computations on the 196 problem: "Pick a number. Reverse its digits and add the resulting number to the original number. If the result isn't a palindrome, repeat the process. Do all numbers in base 10 eventually become palindromes through ...more>>

  36. Through Mazes to Mathematics - Tony Phillips; Dept. of Mathematics, SUNY-Stony Brook
    Material about a class of mazes that have a complete mathematical description. Includes building your own labyrinth, an activity suitable for 4th-graders and up. Explores the relationship between mazes and mathematics. Examples and calculations with Simple, ...more>>

  37. 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 ...more>>

  38. Thue Equations - Clemens Heuberger
    A special family of equations F(X,Y) = m, where F is an irreducible homogeneous form of degree n at least 3 and m is a nonzero integer. With a list of special cases that have been solved. ...more>>

  39. TI-83 / TI-84 Games and Programs - Bill Paetzke
    Bill Paetzke offers TI-83/TI-84 Plus programs to help students and teachers be more efficient in using their calculators. The programs are organized under these categories: Algebra, Finance, Geometry, Physics, Programs, Statistics, Trigonometry, and Tutorials. ...more>>

  40. TI84 Basic Programs
    Programs for the Ti84 or Ti83+. Available subjects include: limits, derivates, integrals, differential equations, vector plotting, vector calculating, complex numbers. Also for control systems: Nyquist diagrams and many programs for electrical engineering. ...more>>

  41. Ti 84 Plus Calculator
    Instructional videos include using the parametric function to construct a pentagram, hypothesis testing, sketching polynomial functions, finding critical points of a function, and using the TVM (Time Value of Money) Solver method. The site also offers ...more>>

  42. TI-85 Programs - John Lindsay Orr; Dept. of Mathematics & Statistics, Univ. of Nebraska-Lincoln
    Integration programs include Riem (calculates a numerical value for the Riemann sum approximation of the definite integral of a function), Circumscribe (calculates an approximation of the definite integral of a function using circumscribed or inscribed ...more>>

  43. TI-89 Calculus Calculator Programs
    TI-89 calculator programs for sale. Enter your variables and see answers worked out step by step: a and b vectors, acceleration, area of parallelogram, component of a direction u, cos(a and b), cross product, curl, derivative, divergence of vector field, ...more>>

  44. ti89.com - Mike Hillwood
    TI-89 and Voyage200 graphing calculator apps for purchase: number theory, geometry, conics, algebra, linear algebra, matrices and vectors, precalculus, trigonometry, calculus, differential equations, discrete mathematics (linear programming, Markov chains, ...more>>

  45. TI89Prog - Mickaël Nicotera
    A French database of programs for the TI-89, TI-92+ and V200 graphing calculators, organized into categories such as math, games, ebooks, pictures, and cours prépa. With an online discussion forum, links to other resources, and more. Available ...more>>

  46. ticalc.org
    The unofficial TI-calculator home page. A non-profit, collaborative effort geared toward fans of Texas Instruments' graphing calculators, acting as a headquarters for all available information on the subject. It is also the home of ZShell and Fargo, assembly ...more>>

  47. Tickling the Mind - Ivars Peterson (MathTrek)
    ... Different math teachers may use different styles and methods, and they may favor different topics. However, they all share the goal of building an appreciation of both the usefulness and the intellectual wonder of mathematics. Much of the current ...more>>

  48. Tides and Tide Prediction - Tony Phillips; Dept. of Mathematics, SUNY-Stony Brook
    General information about tides and tide prediction: Priming/Lagging: a calculus with calculators exercise demonstrating the priming and lagging of the tides at Stony Brook. Samples of current tide predictions from the National Ocean Service. TideSounds: ...more>>

  49. TierneyLab Puzzles - John Tierney
    Challenging word problems that "put ideas in science to the test," from The New York Times' science columnist. Solve and comment on the puzzles and their extra credit extensions. See also Tierney's blog entries on mathematics. ...more>>

  50. Tiesforteachers
    A company in the UK selling neckties specifically with the school curriculum in mind. The growing collection includes ties for teachers of maths, science, English, music, ICT and other general-purpose school subjects. ...more>>

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