 Some Puzzles I've Solved  Sidney Cadot
Notes and observations on the games Peg Solitaire, the Bedlam Cube, the Bart Salters Puzzle, a dominolike puzzle by Rubik. Also, a text list of solutions to the 24 Game.
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 Some Solid (Threedimensional) Geometrical Facts about the Golden Section  Ron Knott
Phi and threedimensional geometry  Dice Shapes; Coordinates and other statistics of the 5 Platonic Solids; The Greeks and the platonic solids; Quasicrystals and Phi; Footnotes on Plato and Euclid, and on shapes for fair dice.
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 Some Thoughts on Measurement  Harold Brochmann
All measurements inherently have limited precision; it isn't sensible to give credence to measurements if you are dealing with a piece of ordinary paper and an ordinary wooden or plastic ruler, no matter how careful the person measuring has been. This
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 Songs for Teaching  S. Ruth Harris, LLC
Lyrics to music that teaches or reinforces math facts and concepts, including addition, subtraction, multiplication, division, algebra, and geometry. Some songs have links to sound files as well.
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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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 Sorting and Analyzing (SMILE)  Vickie Townsend, Crown Fine Arts Community Academy
A K12 lesson designed to teach students to sort, compare, and analyze through exploring, observing, and examining concrete objects, and to recognize a bar graph. From the Patterns and Logic section of a collection of almost 200 single concept lessons
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 The Source of UK Facts and Figures  Government Statistical Service, Office for National Statistics, UK
The information you need to access UK statistics. Links to: The Campion Fellowship in Official Statistics; Population Trends 98  reference and report tables; Quarterly Civil Service Staff in Post; UK in Figures 1999; Scottish Statistics Publications;
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 Source Panel Integrals / Java Matrix Solver  Marc Gerritsma, Jamie Grier
The source panel integrals Javascript can be used to calculate the integrals and the matrix elements of the source panel method (see sec 3.17 of Fundamentals of Aerodynamics, 2nd edition, by J.D. Anderson, jr.). The Java matrix solver can be used to solve
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 Southeast Regional Climate Center  Water Resources Division, South Carolina Department of Natural Resources
Home site for CIRRUS, the Climate Interactive Rapid Retrieval System, an educational medium that provides economically and environmentally important climatic information. The system gives students the opportunity to observe and analyze the weather on
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 Southwest Educational Development Laboratory (SEDL)
The regional education laboratory serving Arkansas, Louisiana, New Mexico, Oklahoma, and Texas. Conducts applied research and development, delivers training, and provides technical assistance to K12 educators and decision makers. Topics: Improving Classroom
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 Sovel PreAlgebra Class  Barry Sovel
In mathematics, we can use the term 'rule', but in reality, there are no rules, only proofs; therefore, we must be able to demonstrate and prove each mathematical statement and expression before we can apply the tag 'rule' to it. Five such demonstrations
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 The Space Between the Numbers  Breedeen Murray
Blog by a math teacher and writer "about how these two aspects are inextricably linked together in my own person, and maybe in yours, too." Posts, which date back to June, 2010, have included "PinkSlip to Private School," "SBG, Hold the G," "A Different
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 SpaceBric
Tetrahedral linking blocks and design software using that shape. Download trial versions of the software or get the fullyfeatured versions with a registration key. Blocks may be purchased on line as well. SpaceBric also offers school fundraising and
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 Space Day 2003  Celebrating the Future of Flight
Space Day 2003 honors the past 100 years of aviation and aerospace accomplishments. On May 1, 2003, teachers, students and space enthusiasts around the world can participate in Cyber Space Day, an interactive Webcast entirely devoted to science, space
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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 Figures and Basic Solids  Mark Motyka, Math League Multimedia
Definitions and illustrations of "space figures" and information on crosssection, volume and surface area for the following: cube, cylinder, sphere, cone, pyramid, tetrahedron, and prism.
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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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 SpaceShape  Matt Storz
SpaceShape is a Windows95 program that allows various 3D shapes to be created and then flattened so that a pattern can be printed to make a model of the 3D shape. Various 3D shapes are supplied with the program (octahedron, dodecahedron, icosahedron,
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 SpaceTime  Chris and Stephen DeSalvo
SpaceTime develops mathematics software for personal digital assistants (PDAs) and other mobile devices such as Pocket PCs, Palm Pilots, and smartphones. Play JavaScript and Flash games in the arcade: ArithmeTick, Math Scramble, Math Mountain, Snake,
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 Spark! Learning Lab  Putnam Museum
This permanent exhibit at Davenport's science museum features a gravity wall, Bernoulli blower, SMARTboard technologies, and other handson exhibits for exploring the science, technology, engineering and mathematics (STEM) of electrical circuits, construction
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 SPA Software
A U.K.based software company, makers of educational software in several subjects including mathematics.
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 Spatial Geometry  Nima Bigdely; NIMA Software Group
3D display software, designed to help students visualize spatial geometry. Shareware for Win95/98/ME/2000/NT/XP. Download available online.
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 Spatial Intelligence and Learning Center
The Spatial Intelligence and Learning Center (SILC) researches spatial learning and develops educational programs and technologies. Every month, the SILC showcase highlights research by different members, who include cognitive scientists, psychologists,
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 Special Interest Groups: American Educational Research Association (AERA)  College of Education, Arizona State University
Index and complete list of AERA SIGs, which provide a forum within AERA for the involvement of individuals drawn together by a common interest in a field of study, teaching, or research when the existing divisional structure may not directly facilitate
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 Specialized Learning Modules  Sherry Ellers; Educational Strategies
A selfstudy correspondence program for special needs students in grades 68, with teaching help available via mail, phone, fax, or email. Middle Level Learning Modules cover language arts, math, reading, science, social studies, and study skills. Modules
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 Speed Math Trainer  Jimmy Ruska
Flashbased, very tiny file size, speed math program including a Google video tutorial. Watching the video tutorial is highly recommended as the program can be tricky to use. Free for redistribution and potentially useful for anyone wishing to increase
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 Sphere Formulas (Ask Dr. Math FAQ)  Math Forum
Formulas for finding the surface area and volume of a sphere, sphere sector, spherical cap, and segment, zone, and lune of a sphere.
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 Spirograph  Anu Garg
A Spirograph is formed by rolling a circle inside or outside of another circle. The pen is placed at any point on the rolling circle. This applet has changeable colors as well.
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 Spliddit  Procaccia, Ariel; Goldman, Jonathan
Provably fair solutions to the everyday dilemmas of splitting rent, dividing goods, and sharing credit. Spliddit's algorithms account for individual rationality, efficiency, maximin share, proportionality, the highest feasibility level of fairness, impartiality,
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 Sport Science  ESPN Internet Ventures
ESPN videos that "uncover sports' biggest myths and mysteries by using cuttingedge technology to measure momentum, friction and the laws of gravity." Also available from http://espnrise.com/sportscience.
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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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 Spreadsheet Basics  Jan Garner
Finding your way around spreadsheets; entering data; graphing with spreadsheets.
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 Spreadsheet Math  Sustainablearning, Inc.
Spreadsheets as laboratories where students can "become a scientist who poses a question, builds a model, collects data, and asks 'What if ...?'" Freely downloadable Excel files that emphasize student choice, challenge, and creativity range from place
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 SpreadsheetZONE  Pagos, Inc.
This repository of Microsoft Excel spreadsheet templates contains a category of math learning tools that covers topics such as base system conversion, exponential functions, logarithmic functions, Cartesian coordinates, derivatives, goodness of fit, polar
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 Springing a Physical Surprise  Ivars Peterson (MathTrek)
Consider a weight hanging from a spring, which in turn is suspended by a piece of string from an identical spring attached to the ceiling. Cutting the connecting string would send the weight and the lower spring plummeting to the floor. Now add two "safety"
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 Spy Guys: Online Elementary Mathematics Resource  Mathematics 6  LearnAlberta.ca
This Flash 5 site includes lessons (Decimals; Improper Fractions and Mixed Numbers; Ratio; Percent; Solving Problems with Decimals; Understanding Integers; Factors, Multiples, and Prime Factorization; Summarizing and Extending Patterns; Rounding Numbers;
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 Square/Cube Roots without a Calculator  Math Forum, Ask Dr. Math FAQ
How do you find the square root of a number by hand? How about cube roots?
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 Square Root Calculator  Chris Misenheimer
This interactive square root calculator calculates the square root of positive, negative, imaginary, and complex numbers, rounded to seven decimal places. Short articles include "Square roots and area," "Square roots without a calculator," and "What does
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 Square Root Calculator  Mimi Stern
Free JavaScript and apps calculators of square and cube roots of positive integers.
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 Square Roots without a Calculator  Math Forum, Ask Dr. Math Common Question
A selection of answers to questions about square roots without a calculator, from the divideandaverage technique to Newton's method to the continued fraction algorithm (CFA).
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 Squares in a Checkerboard  Math Forum, Ask Dr. Math Common Question
A selection of answers to questions about how many squares or rectangles there are in a checkerboard or in an NxN square.
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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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 Squaring the Circle  MacTutor Math History Archives
Linked essay covering the problem of squaring the circle in the form which we think of it today, which originated in Greek mathematics: given a circle, construct geometrically a square equal in area to the given circle. This article discusses the history
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 SR Education Associates, LLC  Steven Rasmussen
Consulting services in educational publishing, mathematics curriculum development, educational technology design and development, educational marketing, professional development for mathematics teachers, advocacy for mathematics and STEM education, and
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 Srinivasa Ramanujan Aiyangar  S.Prasad
A short biography of Ramanujan, with links to related Web pages.
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 SsgtMath  Ricardo Sinclair
Ten to fifteen minutelong whiteboard introductions to Common Core State Standards (CCSS) ideas, geometry constructions, proofs, precollege algebra, college algebra, and more.
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 Standard Deviation, Part 1  Barbara Christopher
Can the standard deviation pick the most consistent set of numbers? or Which city's temperatures vary the least, San Diego or San Francisco? An interactive project in which students use the Internet to find statistical data for the mean, standard deviation,
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 Standard Deviation, Part 2  Barbara Christopher
Do cities closer to the ocean have more consistent temperatures? A followup to Standard Deviation, Part 1. Students use the Internet to gather temperature data from 3 cities; calculate the standard deviation and percentage error of the gathered temperatures;
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 Standards for School Science and Mathematics: Background, Purposes, Goals, Principles  Lynn Arthur Steen, St. Olaf College
A "sidebar" on background of the standards movement in science and mathematics
education prepared for the National Science Foundation's "Indicators" study for 1995. In 1994 Indicators of Science and Mathematics Education. Washington, DC: National Science
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 Standup Mathematician  Matt Parker
Parker uses funny presentations and handson activities to "make people more excited about maths." Watch videos of his comedy routines, including "Skills for bills," in which he introduces the notion of "standard meal units" for calculating each person's
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