 Student's T Distribution  Balasubramanian Narasimhan
The t distributions were discovered in 1908 by William S. Gosset, a statistician employed by the Guinness brewing company, which had stipulated that he not publish under his own name. He therefore wrote under the pen name "Student." This page discusses
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 studio:ludens  Wouter Walmink and Alexander Rulkens
Free online tools that "let you play with your own creativity," designed by two Dutch industrial and interaction designers in Eindhoven. Create your own patterns with Repper; your own tessellating coasters with Epa:kato; your own fractals and other complex
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 Studying Mandelbrot Fractals  Suzanne Alejandre
What is a fractal? A definition and a Java applet to help in exploring the Mandelbrot set, redrawing small areas to fill the fractal screen and noticing how the images compare. Also links to other sites with fractal information for middleschoolers.
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 Studying Polyhedra  Suzanne Alejandre
What is a polyhedron? A definition and a Java applet to help in exploring the five regular polyhedra to find how many faces and vertices each has, and what polygons make up the faces. Also links to a page of information about buckyballs, stories written
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 Study Island
Internetbased standardsmastery products, based on state standards. Subscriptions are available for single classes through districts, with individual subscriptions available for GED products.
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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
Flashbased game: enter a 9x9 grid so that every column, every row and each of the nine 3x3 segement contains the numbers 1 to 9. The game provides hints when you are stuck and has different levels.
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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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 Sudoku  PedagoNet
Sudoku online. New puzzles generated regularly; archive of past puzzles.
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 Sudoku Shuffle  ridiculopathy.com
Play a Flash version of Sudoku online or print out one of these logic puzzles. Choose a level of difficulty and whether to play with number tiles or letter tiles.
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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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 Sum of squares  Dario Alpern
An applet that decomposes any integer number up to 1000 digits long into a sum of four or less perfect squares.
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 SUMS Online Mathematics  SUMS ONLINE Limited
Eighty core activities in handling data, shape and space, calculations, and numbers. Trial sample activities in the playground: Fraction Monkeys, Bracket Basics, Fruit Picker (angle rotation), Place Value Darts, Hidden Craft (grid positioning), Division
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 Suntex First in Math  Suntex International Inc.
Play sample games of 24 online for free, or purchase a site subscription and register for access to a full range of interactive 24 games. Learn more about First in Math classroom kits, school kits, and the McDonald's restaurants First in Math League.
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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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 Superliminal  Daniel Green
Use the Tyler applet to create polygons of various sizes and attach them to edges of other polygons. Read about deltahedra, flexible polyhedra, and infinite polyhedra  figures made of an infinite number of polygons which would then fill all of space
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 Super Maths World  P. and R. May
Topicbased multiple choice assessment with a videogame feel. Yearlong subscriptions available for schools/districts, with a reduced rate for small schools and individual customers. Some activities are free to guests.
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 Surface Area of a Cone  NASA Lewis Learning Technologies Project
What is the approximate surface area of a cone whose slant height is 6 inches and whose radius is 3 inches? A detailed answer is provided. From NASA's 9th Grade Math Proficiency Test.
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 Surface Area of a Rectangular Solid  NASA Lewis Learning Technologies Project
What is the surface area of a rectangular solid whose length is 6 centimeters, depth is 5 centimeters, and height is 4 centimeters? A detailed answer is provided. From NASA's 9th Grade Math Proficiency Test.
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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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 Surface Plotter  Yanto Suryono
A Java applet that plots surfaces defined by explicit twovariable mathematical functions (i.e: z = f(x,y)). Surfaces thus plotted may be rotated in any direction.
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 Surfin' Sinefeld: Flash Animations for Precalculus, Calculus and Statistics  Ralph Irons
Animated graphing calculators for exponential, logarithmic, sinusoidal and
power functions and their derivatives; animated histogram for 5 data sets;
quizzes; Derivative Pong.
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 SURFSTAT australia  Keith Dear; National Centre for Epidemiology and Population Health, The Australian National University
An online text in introductory Statistics from the University of Newcastle. Contents: Summarizing and Presenting Data (Types of Variate; Presenting Discrete and Continuous Data; Charactistics of a Distribution; Measures of Central Tendency and Variability;
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 The Syllogistic Machine  Johan Mårtensson
A JavaScript machine for checking the properties of Aristotelian syllogisms, with links to Mårtensson's OnLine Logic Book.
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 Symmetrier, monstre & tesselationer med The Geometer's Sketchpad  Allan Bergmann Jensen, Kalundborg, Denmark
GSP Symmetries, Patterns and Tessellations. Contains a gallery of wallpaper designs constructed using the Geometer's Sketchpad with JavaSketchpad versions to explore, an illustrated paper on "The Math About Symmetries" (in Danish), a GSP guide, a links
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 syzygymatrix: solutions for small problems in the classroom  Jeff LeMieux
Generate cryptograms, division worksheets, fraction worksheets, and proportion problems. Select the length of dividend, denominators specified by the Washington State Standards for Grade 7, number of problems, and more. The worksheet maker prints solutions.
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 Syzygy Shareware  Thomas C. Bretl
A source of math freeware for both Mac and PC, appropriate for grades K12. Includes games,
simulations, and skillbuilding programs. Explore, see in new ways, discover patterns, and solve
problems.
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 Table of numbers problem  Dario Alpern
Place the natural numbers between 1 and mn in a table of m rows by n columns, so that the sum of the addition of the products of the numbers that compose the rows plus the addition of the products of the numbers that compose the columns is as low as possible.
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 Taking 20 Percent Off  NASA Lewis Learning Technologies Project
If a $900 computer is on sale for 20 percent off, what is the sale price? A detailed answer is provided. From NASA's 9th Grade Math Proficiency Test.
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 Taking Games Seriously  Cut the Knot!, Alexander Bogomolny
In the twenty years since it first appeared, Winning Ways for Your Mathematical Plays had become a classic and a rarity. So did its companion book, On Numbers And Games, which was written in just about a week by one of the WW's authors and saw the light
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 Talking about Probability: A Study on Learning Probability Theory via a Dialogue System  Dr. Dietmar Janetzko
After an initial quiz, a "talking head" will present and discuss problems in probability theory. You don't
have to be an expert on probability theory to participate, though people with a background in that field may also enjoy asking questions of Dr.
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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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 Tangrams  J. L. Read; Enchanted Mind
A tangram applet that allows you to rearrange the seven forms to exactly reproduce the given image. To move the pieces, drag them with the mouse. To rotate pieces, click with the right mouse button or (on the Mac with a onebutton mouse) click while holding
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 Taxicab Geometry/La Géométrie des Taxis  Pascal Tesson
A term project for a Pattern Recognition course given by Godfried Toussaint at McGill University. Other student projects from 1997, 1998 and from a Computational Geometry course are also available. Contents: What is Taxicab Geometry? Why Taxicab Geometry?
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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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 Teaching Introductory Statistics in the Social Sciences and Engineering (Mathematics Across the Curriculum)  Dartmouth College
A course that brings together faculty from many different departments who collaborate to produce instructional modules that can be used interchangeably in different introductory courses in statistics, and which integrate the most current technology available
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 Teaching Materials (Mathematics Archives)  University of Tennessee, Knoxville (UTK)
Links to collections of: Calculus Resources Online; Emerging Scholars Program; Graphing Calculators; JAVA and Other Interactive WWW Pages; Lessons, Tutorials and Lecture Notes; Mathematics and the Liberal Arts; Sites Dedicated to the Teaching of Collegiate
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 Teaching Pets  Andy Davis
See the math resources section of this collection of worksheets and related resources for the primary and middle grades teachers.
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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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 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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 TeachMeWell.com  TeachMeWell, Inc.
TeachMeWell.com provides online math help for children ages 5 to 10 or in grades 1, 2, 3, 4 or 5, covering basic math problems with an emphasis on speed and accuracy. Full details and pricing options are available on the site.
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 TeAchnology  Teachnology, Inc.
A portal for information about current and past practice in the field of education. Read math teaching "Ideas That Worked"; and tutorials ranging from teacher retirement planning and "What to Consider When Writing a Lesson Plan" to "How to Deal With Disruptive
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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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 Team Umizoomi  Viacom International Inc.
Milli, Geo, and Bot solve everyday math problems with their "Umifriend" preschoolers. Get Mighty Math crafts, games, printables, and recipes. Download episodes of this animated liveaction series broadcast on Nickelodeon's Nick Jr. television show.
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 Technologies: Past and Future  Cut the Knot!, Alexander Bogomolny, with Don Greenwell
A discussion of the similarities in browsing through books and surfing the Internet, the serendipitous discoveries that can be made, fallacious geometric and other puzzles, and an interesting integer matrix, with recommendations of books to read and sites
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 Technology PoWs  Math Forum
Challenges modeled on the Forum's Problems of the Week (PoWs) that take advantage of interactive mathematics tools. Students are invited to follow the link to "Submit your answer" to share their solutions, and then "selfmentor" using specially designed
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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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