 The Surface Area of a Cylinder (Version 2.0) (SMILE)  Edwina R. Justice, Gunsaulus Academy
A grade 8 group activity that uses a phenomenological approach, teaching students to apply concepts to a problemsolving situation. From the Geometry and Measurement section of a collection of almost 200 single concept lessons by the Science and Mathematics
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 TagMath  Cody Taggart
Blog by a Wisconsinite now teaching at the United Nations International School in Hanoi (Vietnam). Weekly updates, 48hour challenges, and other posts addressed to Taggart's students date back to February, 2012; and have included "Dublox," "Reviewing
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 Taking a Workshop or Course  Annenberg Media
Workshops and courses appropriate for preservice and inservice teachers, administrators, reformers, and policymakers. Supplemental video programs called teaching practices libraries are also availablethey give a "flyonthewall" view of real teachers
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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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 Tap Into Teen Minds  Kyle Pearce
"Transforming mathematics education in an iPad paperless classroom." Posts, which date back to September, 2011, have included "Apple TV In The Classroom – The New Smart Board," "OAME Tap Into Teen Minds Educational Technology Presentation," "Problem Solving
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 Tareasgratis.com, GetaPlus.com
Ayuda gratuita para las matematicas y las ciencias. Free homework help in math and science for students around the world. A site in English and Spanish (see also http://www.tareasgratis.com/ and http://www.getaplus.com/ or http://www.mystudysite.com/).
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 Tarrou's Chalk Talk  Rob Tarrou
Hundreds of instructional videos, most less than thirty minutes long: geometry, matrices, factoring polynomials, trigonometry, precalculus, calculus, AP Statistics, TINspire calculators, and more. Tarrou, who has taught math at St. Petersburg (FL) High
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 Teacher Exchange  the Math Forum
Web units, lessons, and activities organized by NCTM Standards and grade band level. Created by Math Forum staff members, educators, and collaborations between the two. Teachers may contribute their own lessons and ideas as well.
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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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 Teachers TryScience
Free lessons, teaching strategies, and resources to spark students' interest in science, technology, engineering and math (STEM). The Teachers TryScience site features collaboration tools for discussing and sharing effective instructional practices. Teachers
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 Teacher Support for the Problems of the Week  Suzanne Alejandre
Teacher support for the Math Forum's Problems of the Week in Math Fundamentals, PreAlgebra, Algebra, and Geometry. Information on the pages includes alignment to the NCTM Standards and links to resources from Ask Dr. Math, Teacher2Teacher, and the Teacher
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 Teacher Ties
A site where you can buy a necktie with a math or engineering motif.
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 Teaching Contemporary Mathematics Conference  North Carolina School of Science and Mathematics (NCSSM)
Papers and talks presented at the conference. Download PDF files of Geometry and Programming: The Forgotten and the Avoided; Student Investigations in Algebra 2 and Precalculus; The Mantid: An Extended Data Problem; Errors and Power in Significance Tests;
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 Teaching Geometry with Google SketchUp  Bonnie Roskes
3DVinci's resources for teaching geometry with this 3D modeling application include projects of the month, videos, teacher resources and guide, 2D and 3D project books, a blog, geometry tips and projects, and much more. Google originally created SketchUp
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 Teaching Mathematics  Daniel Pearcy
Pearcy has used this blog, subtitled "Questions, Ideas and Reflections on the Teaching of Mathematics," as a "journal of ideas, lessons, resources and reflections." Posts, which date back to October, 2011, have included "New Sunflower Applet: Fibonacci
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 Teaching Math to Visually Impaired Students  Susan Osterhaus, Texas School for the Blind and Visually Impaired (TSVBI)
Questions and answers offering teaching strategies for improving the mathematical
understanding of visually impaired students. Challenges include solving quadratic equations; geometric constructions; transformations, line symmetry, and tessellations;
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 Teaching  Peter Alfeld, University of Utah
A page of teaching resources intended primarily for Alfeld's University of Utah students, but useful to others as well. Includes a passage from Richard Feynman on teaching; Understanding mathematics  a study guide; current and past courses (Analysis
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 Teaching Resources: Mathematics  McGrawHill School Division
Activities and lesson plans for grades 16, linked to McGrawHill's program Math in my World; also MathTalk  conversations about key issues and teaching strategies (e.g. cultural diversity; manipulatives; technology; problem solving); and "Ask CyberScout!"
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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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 teachmathematics.net  Noble, Jim; Wade, Richard; and Bowles, Oliver
Collections of activities, movies, virtual manipulatives, presentations, simulations, screencasts, and other resources for math "lessons to look forward to." See also the mathematical experience, a discussion in response to the question "What makes a
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 Teach Math for Free  Akshay Kaushik
Blog of basics concepts on geometry, tricks for faster arithmetic calculations, and more. Posts, which date back to November, 2014, have included "Short cut for Multiplication tables from (1119)," "Cubing a number  Simplified," "Basics of Circles 
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 Teachoo
Downloadable slides of topics from the maths section of the CBSE (Central Board of Secondary Education), with solutions of all NCERT chapters.
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 TEAMS Distance Learning for K12 Educators  Los Angeles County Office of Education (LACOE)
Information about TEAMS (elementary distance learning provider); TEAMS classroom projects; and discussion groups for TEAMS participants. Also numerous links to
resources for math, science, social sciences, language arts, art and more; lesson plans; K12
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 Tech Adventures in a Middle School Math Class  Caryn Trautz
Blog by a special education middle school math teacher and Certified Google Educator. Posts, which date back to June, 2013, have included "My First Year with iPads," "QR Code Scavenger Hunt," "Appsmashing with Desmos," "PD on Plickers," "Fraction Review
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 Technology in the Geometry Classroom  Math 5337, The Geometry Center
Course materials developed at the Geometry Center and used for teaching pre and inservice teachers of high school geometry interested in using technology in their classrooms (see the Summer 1996 syllabus ). Four selfcontained parts: Internet Skills,
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 Technology 'Nformation forTeachers (T'NT)  Lesson Plans
Units of Lesson Plans: directories of lesson plans that form a curriculum unit or theme. Lesson Plans: abstract and complete versions of the T'NT Lesson Plans. Search by grade level or subject, or search all lesson plans.
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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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 Termesphere Gallery  Dick Termes
Spherical paintings that use a six point perspective. View images of the paintings and read about the artist. Products and services include workshops, lectures, books, and models of the Platonic solids, as well as the painted spheres.
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 Tetrakys
Interlooping equilateral, isosceles, and scalene triangles for building two and threedimensional geometric objects, exploring area and volume, and visualizing fractions and arithmetic operations. The foam composition of these colorful manipulatives
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 Tágoras  Luis Roche
Colección de ejercicios de matemáticas resueltos con detalle de principio a fin para alumnos y alumnas de Secundaria, Bachillerato y Ciclos. Temas incluyen derivadas, estadística, inecuaciones, límite de funciones, operaciones,
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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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 Theatrix (SWMC)
Sanctuary Woods Multimedia Corporation has joined with Theatrix Interactive to provide educational digital media experiences for kids. Currently offers Shockwave games, CDRom educational programs, and contests. CDRoms work with both Windows and Macs;
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 TheGeometryTeacher  Andrew Shauver
Shauver, who teaches at a Michigan public high school in a onetoone laptop program, blogs to "describe his own independent learning and to reinspire the natural curiosity sometimes absent from the typical high school classroom." Posts, which date back
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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: Plane Geometry  Lawrence Spector; Borough of Manhattan Community College, CUNY
A complete course based on Book I of Euclid's Elements, culminating in the Pythagorean theorem. Includes questions for checking understanding, with solutions.
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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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 Think3d!  Allyson Hutton, Director
Inspired by an architect's visit to a 4th grade classroom, this elementary school curriculum develops spatial reasoning and visuospatial thinking through 2D to 3D transformation challenges in origami and popup paper engineering. Collaboration with
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 Think & Derive  Chris Long
Monthly mathematical columns from May 1994 through April 1996 written for Central New Jersey Mensa's Forvm. Problems and puzzles, many with solutions.
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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 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
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 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";
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 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
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 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
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 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.
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 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 rulebased reason, needed in all disciplines for writing or a
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 Through the Glass Wall: Computer Games for Mathematical Empowerment (TERC)  Testbed for Collaboration, Eisenhower Regional Consortia
An NSFfunded 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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 TI83 / TI84 Games and Programs  Bill Paetzke
Bill Paetzke offers TI83/TI84 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.
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 ti89.com  Mike Hillwood
TI89 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,
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 Tiling and Packing results  Torsten Sillke
Packing problems, mostly, in English, with some in German. Packing Polycubes and Polyspheres; Tilings with Matching Conditions; links.
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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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