 Teachers Helping Teachers: Math Lessons  Scott Mandel
A nonprofit service providing teachers with ideas that can be immediately implemented in the classroom, tips, and lessons for K12 math classes.
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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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 Teaching Math to Young Children  Rick Garlikov
One of a series of webpages to help students understand math, and to help parents teach their children math  especially to help children have a good foundation. (These are not pages to teach the mere recipes or algorithms for solving problems.)
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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 to the Beat of a Different Drummer  Brian Stockus
Blog by a lead curriculum specialist for elementary mathematics in Texas who taught elementary school and led content developers in the design of digital math lessons. Posts, which date back to August, 2012, have included "To question, how to question,
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 Teach Kids Math With Model Method  Zach
Tutorials for parents or teachers, of the Model Method, widely used in Singapore Math by Singaporean teachers, tutors, and parents. Covers the method for basic operations, fractions, decimals, percents, averages, and ratio.
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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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 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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 Technische Universität München School of Education
Research, publications, teaching portfolios, and more about the Technische Universität München (TUM) School of Education, which trains teachers for vocational schools and upper secondary schools (Gymnasien) in Germany. See, in particular, the
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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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 Teri Daniels Books  Teri Daniels
Daniels is the author of the picture book Math Man (Scholastic Books), an IRA/CBC Children's Choice selection. The site contains information on the book, enrichment activites related to the book, and a list of math picture books the author recommends.
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 Test and Worksheet Generators for Math Teachers  Kuta Software
Free printable prealgebra and algebra worksheets in PDF format with answer keys provided; free trials of the worksheet generator software. Purchase online. Windowsbased.
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 Test Banks  Ask Away Ltd.
Data banks of test questions prepared by classroom teachers for use in assorted disciplines in Canada and the U.S., including mathematics grades 7, 8, and 9. Sample questions are available on the site.
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 TestPrep Mathematics Table of Contents  Pamela Cohen, Walter Antoniotti
Free practice problems worksheets in whole numbers; fractions; decimals, ratios, rates, proportions, and percentages; exponents, roots, algebra, and geometry; using formulas to solve problems; multistep word problems; and graphs, signed numbers, statistics,
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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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 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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 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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 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
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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 Third Grade (AAA Math)  John Banfill
Interactive math exercises, lessons, and games covering basic math concepts and methods, for third grade.
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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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 Tiggly  Kidtellect Inc.
"Feel what you learn." Apps to develop toddlers' and preschoolers' spatial reasoning, motor skills, language, and creativity have included Tiggly Christmas, Tiggle Addventure, Tiggly Safari, Tiggle Cardtoons, and Tiggly Counts, which features five lightweight
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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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 Timesavers for Teachers  Stevan Krajnjan
Readytouse, oftenused forms, checklists, masters, timesaving ideas, reference materials, resources and other reproducible worksheets for classroom use. Purchase books for immediate download and printing.
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 Times Table Rhymes  Benita BuchholzSchafer
Times table rhyme stories offer fun reading practice along with one hundred large colorful pictures. For elementary/primary school age. On CD.
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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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 Tim Stirrup  Tim Stirrup
Blog on mathematics education and technology. Posts, which date back to November, 2014, have included "On textbooks, marking and feedback"; "Ideas from Shanghai — using technology to teach mathematics"; "Growth mindset, mathematics and a problem";
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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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 TouchMath: Multisensory Math Supplements  Innovative Learning Concepts, Inc.
The TouchMath Method is a multisensory approach to teaching basic number concepts, addition, subtraction, multiplication and division. TouchMath integrates digits 1 through 9 with a corresponding number of "touchpoints." Students physically touch each
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 Toupty.com: Jeux Éducatifs en Ligne
In French or English: free educational children's games, some involving simple mathematical concepts.
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 Trachtenberg Speed Math  Alpha Centauri Software
Software that teaches Jakow Trachtenberg's speed system of basic mathematics that he invented while imprisoned by Hitler during WWII. For Windows only. Demo version available.
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 Traditionalist Becoming NonTraditional  Christy Sutton
"It wasn't until I was already a teacher and took some math courses for Professional Learning that my rule following math approach was tested. Once I began my Masters Degree in K8 Math Ed from the UGA campus in Griffin my math world was really shaken
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 Transum  John Tranter
Activities, puzzles, problems, investigations, "starters of the day," "shine + write" prompts to project on a whiteboard for students to then write on as part of a whole class exposition, Flash games, and more.
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 TriMathlon: A Workout Beyond the School Curriculum  A. K. Peters, Ltd.
Companion site to the book TriMathlon: A Workout Beyond the School
Curriculum, by Judith and Paul Sally. Discuss math, the book, or the site with members of the Trimathlon community; explore the current "Periodic Puzzler"; or play one of the Shockwave
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 True Learning  Jinhee and Joseph Kim, TrueLearning LLC
Early learning curriculum, worksheets and lesson plans. The True Math activities provide an advanced foundation in math for your child with visually intuitive and engaging exercises. Free samples.
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 Tumblehome Learning
Makers of educational products such as Lost in Tangrams and  through a partnership with TERC, with funding from the National Science Foundation (NSF)  Mixing in Math (MiM) cards, gameboards, and books.
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 TutaPoint.com  TutaPoint.com
Tutapoint.com provides online math, science, and language tutoring. Math subjects include basic math and high school topics.
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 The Tutor House: math  Adrianne Meldrum
Tutoring elementary and middle school students, Meldrum would often "hunt the Internet for tips and helps on teaching concepts to my students. I find great stuff, but I wanted somewhere central that other tutors like me could find them...." Every Wednesday
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 Tutorial World  Strategic Thinking Business P/L Singapore
Provides two sample printable worksheets covering a variety of topics for
preschool and primary grades from 1 to 6. Registered users (approximately
US $11.10) have access to more worksheets and also answer sheets.
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 Tutor Pace  Tutorpace Inc.
Online homework help tutoring. Free math resources include descriptions of and primers for prealgebra, algebra, geometry, trigonometry, statistics, and calculus.
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 TutorTeddy.com
Online tutoring sessions across grades in arithmetic, algebra, statistics, probability, calculus, geometry, and trigonometry. The TutorTeddy.com site also freely offers more than a hundred chalkboard video lectures and worked problems.
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 TutorVista  TutorVista.com
Interactive lessons, worksheets, and homework help for math students grades 312 from this online education company.
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 Tutor World Online
This online tutoring service sells homework help and SAT preparation packages. The Tutor World Online journal posts free primers in math.
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 UBUYACAR  Maricopa Center for Learning and Instruction
An online problembased 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 problemsolving process. A Tutor's Manual
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 Understanding 'Rate' Word Problems  Rick Garlikov
A conceptual explanation of doing various kinds of math "rate" problems (e.g., "distance/speed/time" problems, problems involving combining work done by different agents working at different rates of speed, quantity/proportion problems, etc.).
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 Under the Dome  Mike Wiernicki
Blog by a math coach and a consultant for Learner's Advantage. Posts, which date back to October, 2013, have included "A Number Talks Reflection — A Look Back Over the Past 3 Years ...," "Relevant Decimals Lesson," "The Penny Cube," and "Are Your
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