 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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 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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 Stupid Calculations  Josh Orter
Repository "where practical facts get rendered into utterly useless ones." Posts, which date back to May, 2013, have included "Monophone," musing on the size of the screen made from ripping the displays out of every iPhone ever sold and combining them
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 Style Line: Wheel Trim and Simulators for the 21st Century
Wheel covers to investigate for reflectional and/or rotational symmetry.
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 Subject:Mathematics  Wikibooks
This Wikimedia project for collaboratively writing opencontent textbooks also produces, under its Wikijunior project, ageappropriate nonfiction children's books illustrated with photographs, diagrams, sketches, and original drawings.
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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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 Subtle Logic, Winning Game  Ivars Peterson (MathTrek)
Seemingly simple games can serve as thoughtprovoking exercises in mathematical logic. They can provide deep insights into subtle issues that confront logicians who are interested in the foundations of mathematics. Socalled Ehrenfeucht games have proved
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 Succeed in: Math! Assessment and Remediation Software
Selfpaced software designed to assess student math skills, identify weaknesses and create a customized tutorial based on each student's needs. The program incorporates animation, text and bilingual narration (English/Spanish) with interactive practice
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 Success for All
Curriculum driven by cooperative learning that focuses on individual pupil accountability, common goals, and recognition of team success, all with the aim of getting learners "to engage in discussing and explaining their ideas, challenging and teaching
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 Successful STEM Education  EDC, Inc.
Information, events, and resources that highlight promising practices and tools in support of effective K12 science, technology, engineering, and mathematics (STEM) education in schools and programs. Resources of this National Science Foundation (NSF)
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 SuccessMaker mathematics courses  Pearson Education, Inc.
A learning environment combining a management system, assessment, and curriculum resources to provide administrators, teachers, and students with tools to improve academic performance. Also available from http://www.pearsonschool.com/index.cfm?locator=PSZk99.
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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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 A Su Doku solver
Solvers for sudoku puzzles, with documentation, source code, and binaries. Frequently asked questions about this numeric puzzle include "Su Doku" or "Sudoku"? How does the solver work? How do I compose a Su Doku problem? How few cells could appear on
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 Sudoku Widget  Brian DeBoer
Macintosh OS X users familiar with Dashboard use its miniapplications to perform common tasks and get fast access to information. The Sudoku Widget by Brian DeBoer generates random puzzles with four different levels of difficulty, has the option to show
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 Suffolkmaths.co.uk  Mark Greenaway
Greenaway hosts a select collection of thirdparty resources in the public domain, many drawn from the UK's Department for Education (DfEs): teaching materials for Great Britain's different grade levels; problem solving documents on problemsolving strategies,
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 SUMaC  Math Camp  Stanford University
A residential summer camp for mathematically talented high schoolers, especially students who are in academic environments that do not offer the framework to excel in mathematics beyond the usual school curriculum.
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 Sumizdat Home Page  Sumizdat
Website of the publisher "Sumizdat", currently featuring the English translation of a classical Russian geometry textbook: Kiselev's Geometry/Book I. Planimetry, Kiselev's Geometry/Book II. Stereometry, and Arithmetic for Parents, translated from the
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 SUMMA: Strengthening Underrepresented Minority Mathematics Achievement  Mathematical Association of America (MAA)
A program intended to increase the representation of minorities in the fields of mathematics, science and engineering and improve the education of minorities. Information about the program, its contributors and projects. Includes a database of biographies
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 Summer Calculus Institute  The Calculus Consortium for Higher Education (CCHE)
A three day institute held at Catholic University (Washington, DC) that disseminated to secondary schoolteachers the pedagogy and resource materials necessary to implement the philosophy of reform calculus in their own classrooms. Within a workshop environment,
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 Summer Math Camps and Programs for High School Students (AMS)  American Mathematical Society
A listing of titles, locations, and links of summer programs that provide high school students experience in the world of mathematics research.
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 SummerMath  Charlene and James Morrow, Mount Holyoke College
SummerMath is a fourweek residential program for girls in the eighth through twelfth grades. Through the classes Fundamental Mathematical Concepts, SuperLogo, and Workshops, students discover how math is applied to everyday life.
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 Summer Workshops for Math Teachers  Henri Picciotto
Information on workshops to come and links to previous syllabi, with handouts.
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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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 Super Bowls and Stock Markets  Ivars Peterson (MathTrek)
The Super Bowl "theory" links U.S. stock market performance to the results of the championship football game held each January since 1967. It holds that if a team from the original National Football League wins the title, the stock market
increases
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 SuperKids Educational Software Review  Knowledge Share LLC
Reviews of educational software in many categories, including math (see Math Software For Young Students and Math Software II). Reviews are comprehensive, including information about price and product support as well as general usability issues. A Math
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 SuperKids Review of Educational Algebra Software  Knowledge Share LLC
Reviews of the educational algebra programs: Astro Algebra, Grade Builder Algebra 1, Math Blaster Algebra, and Mathpert Algebra Assistant. Ratings based on educational value, kid appeal, ease of use, hardware requirements, and a buyer's guide (price comparison).
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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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 Supermarket Math  Keith Devlin (Devlin's Angle)
Is it really possible to acquire skills  mathematical or otherwise  in a decontextualized fashion in a classroom setting, then make use of those skills in any reallife situation that may require them? The assumption that this is indeed possible is
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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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 Supporting ELLs in Mathematics  Stanford University
Materials that illustrate how Common Corealigned math tasks can support math instruction and language development for English Language Learners (ELLs) in elementary, middle, and high school. Learn about the development of this material from Stanford
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 Supporting SenseMaking and Perseverance  Suzanne Alejandre
Article about how the Math Forum's noticing and wondering not only values each learner, it "also works to engage all learners in finding their mathematical voice." Originally published in the March, 2013, issue of the CMC ComMuniCator, journal of the
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 Suresh Lala's Math Quizzes  Suresh M. Lala
This quiz blog contains questions in algebra, geometry and arithmetic, to test and reinforce math skills and applications.
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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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 Surfaces Beyond the Third Dimension  Thomas Banchoff
A site that documents an art exhibit hosted by the Providence, Rhode Island Art Club in 1996, featuring computergenerated artwork designed by Tom Banchoff in collaboration with Davide Cervone (now at Union College) and student associates at Brown University.
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 Surfaces (Geometry and the Imagination)  Conway, Doyle, Gilman, Thurston; The Geometry Center
A surface, or 2manifold, is a shape any small enough neighborhood of which is topologically equivalent to a neighborhood of a point in the plane. For instance, a the surface of a cube is a surface topologically equivalent to the surface of a sphere.
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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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 Survey of the Classes of 1997 Concerning Their High School Math Programs and How Well These Programs Prepared Them for College Math  Gregory F. Bachelis
A Bloomfield Hills School District (BHSD; Oakland County, Michigan) survey comparing the college performances of high school students with differing high school math programs, particularly in response to the the advent of the CorePlus Mathematics Project
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 A Survey of Venn Diagrams  Frank Ruskey; Dept. of Computer Science, Univ. of Victoria, B.C., Canada
Facts and figures about Venn diagrams, particularly as they relate to combinatorial properties of the diagrams: Who was John Venn? What is a Venn diagram? Formal definition of Venn diagrams; General constructions of Venn diagrams. Also Graphs associated
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 Suspension Rates at U.S. Schools  Regents of the University of California
Bar graphs of suspension rates at the nation's schools, based on data from the U.S. Department of Education's Office for Civil Rights Data Collection. Select grades, state, and district(s) to see public school disciplinary information according to race,
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 sxpmaths  Stuart Price
Blog, subtitled "education, maths, procrastination," by an Alevel Maths and Further Maths teacher in southern England "always exploring ideas." Posts, which date back to August, 2013, have included "AS Maths and Mathematical Thinking"; "Reading, Reliability
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 Sybilla Beckmann Kazez
Biography, books, projects, papers, and presentations of the Josiah Meigs Distinguished Teaching Professor of Mathematics at the University of Georgia (UGA). Originally researching arithmetic geometry, Beckmann now considers the mathematical education
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