 Soap Films and Grid Walks  Ivars Peterson (MathLand)
A simple, physical demonstration of a mathematical truth can produce a lasting impression  one that inspires new questions and speculations. For Christopher C. Chang, a student at Henry M. Gunn Senior High School in Palo Alto, Calif., and one of 40 finalists
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 SoftSchools.com  Mani Gudavalli
Free math worksheets and interactive online games for practicing times tables, adding, subtracting, telling time, and more. Organized into prek, kindergarten, grades 12, grades 34, grade 5, measurement, and fun games.
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 Software  Bill White
These Flash apps provide online practice deriving some unknown property of a figure given its other measures. Find the area of a trapezoid given its two base lengths and height; find one of its bases given its area and height; find its height given its
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 Solutions to Heinemann AS/A Level text books  George Ierotheou
To provide ample examples of how to apply the key methods and techniques used at AS/A level.
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 Solve for n  NASA Lewis Learning Technologies Project
Solve for n: 3/n = 7/12. A detailed answer is provided. From NASA's 9th Grade Math Proficiency Test.
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 Solve for y  NASA Lewis Learning Technologies Project
Solve the following for y: 12y  16 = 20y. A detailed answer is provided. From NASA's 9th Grade Math Proficiency Test.
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 Solve My Math  Solvemymath
Online math integrals calculator, derivative calculator, function grapher, math formulas and facts, math quizzes and puzzles.
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 Solve This!  ThinkQuest 2003
Information about eight famous mathematicians, with interactive quizzes, static problems and games.
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 Solving Equations  Don Cohen (The Mathman)
Make equations or open sentences true by guessing. Equations with X's on both sides; quadratic equations (11 ways to solve a quadratic equation); using balance pictures to solve equations. Sample problems with some answers from Chapter 8 of Don Cohen's
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 Solving Inequalities with One Operation  Internet Academy (IA)
Stepbystep instructions for learning how to solve and graph inequalities, with problems and solutions.
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 Solving Math Word Problems  Hal Schneider
A selfhelp tutor for grades 612, remedial math (all levels); and adults. Chapter titles: Elementary Math Rules; Working with "ONE"; Working with Fractions; The ' Word/Fraction' Technique; Elementary Algebra, Factoring & Ratios; Common Forms of Equations;
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 Solving On Line problems of Inventory Control  G.B. Rubalsky
Online solver for special optimization problems, plus samples of problems, solution methods, algorithms and programs, which might be of interest to those involved in operations research, numeric optimization and stochastic processes.
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 Solving Quadratic Equations  Prakash Sukhu
Introduces the general form of the quadratic equation, and shows how to solve the quadratic equation step by step. Includes methods of factorisation and completing the square, questions to test your knowledge, and an online equation solver with which
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 Solving the Rubik's Cube  Matthew Monroe
Instructions, popularized by Minh Thai, the National Champion cube solver, for solving a 3x3x3 Rubik's Cube. Also, instructions for how to solve a cube when it has oriented pictures on each face. Directions for solving a 2x2x2 Rubik's mini cube, the professor
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 Solving Word Problems: Applications of Exponential and Logarithmic Functions (S.O.S. Mathematics)  Dept. of Mathematical Sciences, Univ. of Texas at El Paso
To solve an exponential or logarithmic word problem, convert the narrative to
an equation and solve the equation. Includes discussions of problems dealing with interest rates, mortgages, population, radioactive decay, and earthquakes.
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 The Soma Cube Puzzle  Modvix
Purchase the Soma Cube. Piet Hein, a Danish poet and inventor, visualized the set of all irregular shapes formed by no more than 4 cubes, each of the same size, and realized that the seven simplest irregular combinations of cubes can form a larger Soma
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 Some Problems in Matroid Theory  Thomas Zaslavsky
Sources of problems compiled by Zaslavsky, and problems he's found interesting: Bonin's Projective Bound; Maximum rFlat; Covering And Packing by Flats. For general sources of information on matroid theory, see Matroid Miscellany.
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 Some Problems & Puzzles  Nancy Casey
Problems inspired by math books (Instant insanity; Penrose rhombs) and friends Larry Copes and Mike Fellows (BikePed, Idaho  also known as Muddy City).
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 Some (Unsolved) Mathematical Problems  Jörg Winkelmann
A collection of some analysis questions the author encountered in the context of his own research.
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 Some Variations on the Theme of Polyominos  Recmath
Patterns that illustrate how the squares of polyominos are connected to each other. Examples of polyominos with a grid superimposed to illustrate the individual squares; with a line that joins the midpoint of two adjacent square if the squares are connected.
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 Sources in the history of algebra: arithmetical and recreational problems  Albrecht Heeffer
A comprehensive database of arithmetical and algebraical problems from sources before the 18th century, for research and educational use.
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 The Southwest Center for Arithmetic Geometry  Romyar Sharifi, Principal Investigator
In this intensive fivedaylong school, advanced graduate students work closely with senior faculty and postdoctoral fellows — not as individual researchers presenting their work in relative isolation, but in highly participatory, extended courses
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 Space Educators' Handbook  Jerry Woodfill, NASA Johnson Space Center
For Mac or PC: programs that include more than 2000 files interactively linked for ease of learning about NASA, space science, space history, and space technology. Many well designed and extensively educational files are available from this Web site,
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 Space Math  Dr. Sten Odenwald
NASA offers realworld problems about astronomy and space science, for students in grades 68 and 912. The problems are in PDF format, and searchable. They are often based on press releases and cover topics from black holes to space weather and the search
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 Spinning to a Rolling Stop  Ivars Peterson (MathTrek)
The underlying mathematics of spinning disks. Spin a coin on a tabletop. As it loses energy and tips toward the surface, the coin begins to roll on its rim, wobbling faster and faster. Toward the end, the coin generates a characteristic rattling sound
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 Spirals of Primes  Bryan Clair, University of Chicago
This page will generate a spiral of numbers, with the primes marked as stars, and the composites as dots. The center of the spiral is marked with an 'X'. Specify the number at the center of the spiral below, and the width (and therefore also the height)
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 Spreading Memes  Cut the Knot!, Alexander Bogomolny
First of a series of interactive columns for MAA Online that use Java applets to simulate a puzzle or mathematical problem, one not stated directly since the applets are intended to be such that the right answer to an as yet unstated problem should be
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 Statbag  Worth Swearingen
A blog repository for statistics educators: "... each teacher should have a bag of tricks. Teachers spend years developing their own favorites. While acknowledging that experience is the best teacher, one purpose of this site is to help teachers develop
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 Statistical Rules of Thumb  Gerald van Belle
This companion website to Statistical Rules of Thumb, published by John Wiley & Sons, Inc., offers free PDFs of chapter two ("Sample Size") and more than a dozen "monthly rules of thumb," such as "Use Text for a Few Numbers, Tables for Many Numbers,
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 STATISTICS.COM
A source for information about statistics software (major packages like SAS, SPSS and SPLUS, shareware, and smaller packages), as well as about statistics analysis, data analysis, and short courses in statistics  messy data, design and analysis of experiments,
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 Statistics, Measurement Uncertainty, and the Number of Galaxies in the Universe Lab  Dennis Zaritsky; Univ. of California at Santa Cruz
From a course in observational astronomy, a lab for exploring some basic issues regarding statistics in astronomy and measurement uncertainties, and finally
produceing an estimate of the number of galaxies in the Universe (with its associated uncertainty).
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 StatsMonkey  Jason Molesky
Notes and resources to assist Advanced Placement Statistics teachers and students. "TPS Resources" include packets, handouts, worksheets, activities, vocabulary crossword puzzles, and Jeopardy! PowerPoint Reviews to accompany The Practice of Statistics,
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 Stat Trek
Free, online tutorial covers basic statistics, probability, distributions, sampling, estimation, and hypothesis testing. Includes online calculators, sample problems with solutions, and glossary of statistical terms.
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 Stayorswitch.com  Jeremy Jones
Game simulation and animated explanation videos of the Monty Hall problem. A blog by Jones, who teaches high school math, dates back to February, 2014, with other probability puzzles.
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 The Steiner Tree Page  Joe Ganley
The Steiner tree problem is a minimum interconnection problem. The most basic
version is in a graph: given a weighted graph in which a subset of vertices are identified as terminals, find a minimumweight connected subgraph that includes all the terminals.
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 Stella's Stunners  Rudd Crawford
More than 600 nonroutine mathematics problems named in honor of the Dutch baroness Ecaterina Elizabeth van Heemsvloet tot Schattenberg. Each collection in the Stella Library contains five subsets, one for each course of PreAlgebra, Algebra I, Geometry,
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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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 Steve Fulling's Home Page  Stephen A. Fulling
Courses in Foundation Coalition Freshman Calculus, linearity, and other subjects offer objectives, assignments, solutions and reports, exams, and supporting documentation such as books (.pdf, .ps, and .dvi formats). The site also includes access to the
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 Steve Mayer's Web Pages  Steve Mayer
Intended for Mayer's students at Bournemouth & Poole College: syllabi, student web pages, assignments, homework, module notes, review material for the A Level Pure Mathematics curriculum, and more, including resources for the Norwegian students he
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 Stochastic Programming FTP Archive  Cambridge University
The Judge Institute: Research: Working papers and resources: Finance: FTP Archive. A set of WATSON pension fund management test problems, with random coefficients generated according to two different procedures  independent scenario generation and conditional
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 The Stony Brook Algorithm Repository  Steven S. Skiena; Dept. of Computer Science, SUNYStony Brook
A comprehensive collection of algorithm implementations for over seventy of the most fundamental problems in combinatorial algorithms. The problem taxonomy, implementations, and supporting material are drawn from Skiena's book The Algorithm Design Manual.
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 The Storybook of Geometry  ThinkQuest 1996
Learn the basics of geometry and see how they relate to real world situations. Explore and read stories that help to uncover the mysteries of geometry. Story problems (with answers): The Great Space Ace; The Pharoah's Pyramid; The Ice Cream Cone; Filling
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 Stroh MathPage  Eric Stroh; Northern High School, Owings, MD
Algebra help for students: explanations, examples, practice problems, and hints for all topics covered in a high school Algebra I and Algebra II course. With pictures from Stroh's class and links to other relevant sites on the Web.
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 Stuck on Homework  Royle, Helen; and Watts, Teresa
Sample selftest exam questions and maths video tutorials presented by an experienced maths teacher. Subscribe for full access to hundreds more, as well as a digital whiteboard and other tools.
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 Student Explorations in Mathematics  National Council of Teachers of Mathematics (NCTM)
An official journal of the NCTM, Student Explorations in Mathematics publishes resources for teachers and teacher educators at grades 510. Each issue develops a single mathematical theme or concept in such a way that fifth grade students can understand
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 Studies In Mathematics: Web Discussion  Breindel, Clair; University of Chicago
The University of Chicago's alternative course to calculus. The first quarter is number theory, and the second quarter is geometry and symmetry. When Bryan Clair taught the courses, he covered the history of number systems, different base number systems
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 Study Guide for the Advanced Placement Calculus AB Examination  Elaine Cheong
A study guide written to assist students in preparing for the Advanced Placement Calculus AB Exam. Introduction explains the scoring of grades on a scale of 1 to 5. Topics of study include elementary functions, limits, differential calculus, and integral
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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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 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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