 Society of Young Mathematicians  SYMs
A UK organization that motivates and encourages "all young people who enjoy mathematics." SYMS publishes articles, news, "things to do," calculator hints, book reviews, games, puzzles, and competitions in its newsletter, SymmetryPlus, and termly journal,
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 SolvingMathProblems
Type up your math questions for free help or see stepbystep instructions on solving problems that involve sets, equations, exponents, roots, or real numbers, such using the number line to compare two decimals or using direct comparison (equivalence)
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 Soroban in Various Number Systems  Interactive Mathematics Miscellany and Puzzles, Alexander Bogomolny
A Java simulation of Sorobanthe Japanese analogue of the traditional abacus and the Chinese Suan Pan. This is the most economical tool of the three.
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 Square Wheel (MatheMUSEments!)  Ivars Peterson (Math Muse for Kids)
A square wheel may be the ultimate flat tire. There's no way it can roll over a flat, smooth road without jolting the rider again and again. Stan Wagon, a mathematician at Macalester College in St. Paul, Minnesota, has a bicycle with square wheels. It's
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 STEM Sheets
Makers of printable flash cards. Choose number ranges, and whether or not to include answers, before freely downloading PDFs of addition, subtraction, multiplication, or division problems.
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 StudyJams!  Scholastic Inc.
An online service that complements the school math and science curriculum for grades 3  6. Aligned with state curriculum standards, StudyJams! takes math and science problems and presents them using relevant, realworld examples students can easily understand.
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 studymaths.co.uk  Jonathan Hall
Free help on your maths questions. See also the bank of autoscoring GCSE maths questions, games, and resources such as revision notes, interactive formulae, and glossary of terms.
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 Suan Pan in Various Number Systems  Interactive Mathematics Miscellany and Puzzles, Alexander Bogomolny
A Java simulation of the Chinese Sorobana far eastern analogue of the traditional abacus. By splitting the field into two partsthe earth and the heavenSoroban cleverly reduces the number of items that represent a single digit. The simulation enforces
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 subtangent.com  Duncan Keith
With Flash, explore interactive investigations such as Number Stairs and Diagonal Differences. Play Mathionaire, based on the popular TV game, but with maths questions. Quizzes include Function Machines, Number Properties, Pythagoras, and Quadratics 1.
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 Sudoku  Pappocom, aka Wayne Gould
Finish filling in the 9x9 grid so that every row, every column, and each of the nine 3x3 boxes contains the digits 1 through 9. Different from a magic square, this puzzle requires no arithmetic, only reasoning and logic to deduce which digit to put where.
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 Sumdog  Peter Beckham, Crocodile Clips Ltd.
Free multiplayer maths games designed to improve numeracy for students aged
913. Players compete either against the computer or other students around the world. The one hundred available games, which adapt to the skill level of each student, range
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 SuperKids Math Worksheet Creator  SuperKids Educational Software Review
Make your own math drill worksheets: select the type of problem (addition, subtractions, multiplication, division, fractions, greater/less than), the maximum and minimum numbers to be used in the problems, click on the button, and a worksheet will be
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 Surface Distance Between Two Points of Latitude and Longitude  John A. Byers, United States Department of Agriculture  Agricultural Research Service
Enter the latitude and longitude of two points on Earth, and this JavaScript program returns the distance between the locations in kilometers, miles, and nautical miles. Similarly, calculate the great circle distances between over 300 cities. Download
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 Symmetry  Rick Engel
A lesson on the symmetry of the Platonic and Archimedean solids using Polymorf, a math manipulative product. Demonstrates inscription, truncation, sectioning, and space filling with polyhedra.
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 TableTrainer
A Windows 95/98 maths program to purchase, designed to be used once a day for about 10 minutes to assist in learning multiplication tables. The program allows you to practice and test multiplication tables from 1 to 12, selecting which tables you practice
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 Taking America's Measure  National Institute of Standards and Technology (NIST)
Resources on this site for children include: Metric Pyramid (a pattern that can be printed, cut out, folded, and taped in the shape of a pyramid); Metric Fast Facts for Sports; Metric in the Kitchen; All You Will Need to Know About Metric; Metric Conversion
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 Tangram Page  S. T. Han
All about tangrams, an ancient Oriental toy that has 7 pieces: 5 triangles in different sizes, 1 square, and 1 parallelogram. The object of the game is to form a given shape using all 7 pieces. Introduction, Puzzle of the Month, PC/Mac Software, Articles
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 Tangrams  Tom Scavo
Tangrams, a puzzle that helps develop spatialvisualization skills, may also be used to introduce or reinforce geometric concepts such as congruence, similarity, symmetry, etc. This unit for grades 4 through 6 uses tangrams to compute the area of polygons
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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 K8 IdeaSite
A monthly professional magazine for kindergarten through eighth grade teachers. The IdeaSite highlights articles in the current issue and provides new ideas and resources spanning the curriculum. Search for math to find relevant matches, or browse Educator
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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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 TeachingTools.com  TeachingTools
Create math practice worksheets: multiplication tables with exercises, whole numbers, decimal and fraction operations, matching exercises for math terms, geometry terms, and 'story problems' clue words, an identifying geometry shapes exercise, and an
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 TeachPi.org
This "onestop Pi Day shop for teachers and number lovers" offers stories, biographies, book recommendations, and other topical resources to celebrate March 14th. Brief descriptions of some of the activities come with extensions and short anecdotes from
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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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 Temperature (SMILE)  Patricia A. Calloway, Spencer Math and Science Academy
A lesson designed to teach students to read temperature on a Celsius thermometer; and to read and interpret bar graphs. From the Practical and Applied Math section of a collection of almost 200 single concept lessons by the Science and Mathematics Initiative
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 Ten Marks  Ten Marks
Intended as a program enabling students to practice and master math concepts through intelligent,
personalized worksheets, 3 minute videos, practice and hints, all at their own pace. This structured program is mapped to state standards for grades 3 through
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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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 TerryStickels.com  Terry Stickels
Puzzle website by author and syndicated columnist Terry Stickels. Visual puzzles, slideshows, and an online store for books, games, and other materials.
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 Tesseracts: Cubes Get Hyper (MatheMUSEments!)  Ivars Peterson (Math Muse for Kids)
Madeleine L'Engle, who wrote A Wrinkle in Time, used tesseract to mean a shortcut through space and time. In her story, spacetime wrinkles, or folds onto itself, creating new paths that allow characters to tesser, or travel from one end of the galaxy
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 Test Professor.com  Test Professor, Inc.
Test Professor offers online diagnostic tests, student assessments, tutorials, math help, testprep, and practice tests. Choose a country, province, or state to see its standards, objectives, targets, skills, department of education, and example problems
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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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 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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 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 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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 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 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 twelfthgrade levels; test items, an annotated TIMSS publication list, and more. See also the 1999
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 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
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 Times Table Triangle  Brenda Batten, White Birch Educational Tools
An interactive, visual math manipulative that helps students memorize multiplication tables. The student inserts a pencil through the hole that corresponds with a multiplier, then turns the Triangle over to find the answer.
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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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 Times to Remember  Clockstone
With this multisensory method of memorizing multiplication facts, learners say, sing or rap the illustrated rhymes, then trace, color, and review the accompanying activity sheets. Published by Joyful Learning Publications, LLC.
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 Time Table Rhyme  Jane Hague
Help teach children the multiplication times tables using visual and auditory memory techniques. Equations include colorful illustrations and simple rhymes to create a picture in the child's imagination, enabling quick learning and random recall. Includes
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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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 Timez Tables  David Villegas
Timez Tables poses random multiplication problems for you to solve in 30 seconds. Similar to a speed round of flash cards, this free app works on iPhone, iPad, and iPod touch.
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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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 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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 Tony's Tiger BITES (SMILE)  Maudestine McLeary, John Hope School
A lesson designed to teach students to make equivalent fractions, follow
directions and complete a recipe for marshmallowcereal bars. From the "Miscellaneous" section of a collection of almost 200 single concept lessons by the Science and Mathematics
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 Tools for Building Math Concepts  the Math Forum @ Drexel
An online workshop for exploring how technology can help students develop fundamental concepts of multiplication, fractions, division and area through the process of generating data and examining patterns. New cohorts are started as they fill, so register
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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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