 SAT Math Pro  Colleen King
Interactive video lessons, timed quizzes, and other instruction for SAT math preparation, categorized into assess, practice, and strategies.
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 SAT Prep Plan  Wendlink
Free SAT study content including streaming video, a custom study plan creator, and many practice problems.
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 SAT Test Prep  Ivy West
An online interactive SAT course, with animation, sound, live tutor help, and learning games.
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 SCalculate  Sookshma Chetas Softwares Pvt. Ltd.
Key values into the boxes to expand algebra expressions, calculate geometry areas and volumes, and convert weights, distances, time, memory, and other units.
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 The Scale of the Universe 2  Cary and Michael Huang
Use the scroll bar or computer mouse wheel to zoom in and out  from quantum foam to charm quarks to "smallest thing visible to an optical microscope" to the thickness of paper all the way up to Cruithne, the depth of the Mariana Trench, Minecraft World,
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 Schoolhouse Flash  Screenic Digital
Addition, subtraction, multiplication and division flash card sets online. Animated math fact equations in Level One for kids to count. Practice cards in Level Two reveal the answer upon a mouse click. Level Three offers a choice of 3 or 5 seconds to
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 SchoolTrainer.com  SchoolTrainer.com Ltd.
SchoolTrainer.com provides a wide range of academic coaching services including online tutoring for Math, Algebra, Geometry, Calculus, Trigonometry for all grades. Free homework help and online study materials are provided as well. Flexible rate plans.
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 School Wiz Tutoring  School Wiz
Australian computerbased maths & English tutoring with live support.
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 Science and More  PublicLiterature.org
This site has a section on applied mathematics educational resources. Topics include projectile motion, differential equation solving, collisions, unit conversion, and prime number generation. Most software is
open source.
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 Science Education at Jefferson Lab  Thomas Jefferson National Accelerator Facility (Jefferson Lab)
Educational resources for students (homework help links; programs and events; games and puzzles; internships) and teachers (summer programs; reference links; distance learning programs; activities, worksheets, and games). See, in particular, Jefferson
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 Science vs Magic  Nico Disseldorp
JavaScript by Disseldorp, who "likes it when simplicity makes complexity": tessellation kit, for kaleidoscopic drawing; fractal machine, for investigating seven axes of self similarity; logic grid, for exploring recursion; and elementary cellular automata.
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 The Secret Garden of Maths  Micky Bullock
Blog by a secondary school maths teacher (Forest School, London, UK) that aims to provide "maths to the masses," with a preference for illustrations via GeoGebra. Bullock describes his "paranoia [as] rooted in the average person's contemptible indifference
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 The Secret Lives of Numbers
A Java applet histogram exploring the relative popularity and cultural associations of every integer between 0 and one million. Numbers such as 212, 486, 911, 1040, 1492, 1776, 68040, and 90210, for example, occur more frequently than their neighbors
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 Secret Millionaires Club  A Squared Entertainment LLC
Lessons, webisodes, and prime time specials that use reallife situations to teach young people how to succeed in life and in business. See, in particular, the free financial literacy classroom materials available through the Learn and Earn promotion.
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 Seeing Math Secondary: Interactives  the Concord Consortium
Seeing Math has developed interactive software Java tools to clarify key mathematical ideas in middle and high school mathematics. Each interactive provides a realtime connection between representations of the mathematics (symbolic, graphical, etc.),
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 Seeing Statistics  Gary McClelland; Duxbury Press
A browserbased statistics textbook that uses interactive Java applets to help students vizualize statistical principles. Registration is required; instructors may request an examination copy, and an introductory tour of a limited edition is available.
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 The SELECT Math Project  Boston Public Schools
The SELECT (Supporting Engaged Learning by Enhancing Curriculum with Technology) Math Project is a Boston Public Schools resource that features over 200 links to webbased virtual manipulatives and resources that directly support the mathematics curriculum
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 SelfInstructional Mathematics Tutorials  Center for Support of Teaching and Learning, Syracuse University
Selfinstructional material for university students of chemistry, economics, political science and/or psychology. Math topics include fractions, decimals, percents, ratios and proportions, tables, bar graphs, circle graphs, the visual display of information,
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 Sense and Dollars  Maryland Public Television
The Sense and Dollars project helps middle and high school students learn about and practice effective ways of earning, spending, saving, and investing money in a safe, interactive environment. Activities include: Earning Money (All About the Benjamins,
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 SEOSL/MathSoL  HPC Software Inc.
Access this Science and Engineering Online Solution Library with username mathsol and password guest. SEOSL contains 2000 JavaScriptbased science and engineering solution functions. It can be used interactively on Web to compute geometry, basic math
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 Septangle  Paul Nahay
Play the game, Septangle, online! Septangle is copyrighted by Dr. Paul Nahay, (DMA, Stanford University 1983).
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 Serendip  Bryn Mawr College
An expanding forum and a continually developing set of resources for exploring and supporting intellectual and social change in education, social organization, and for making sense of life, organized into: Brain and Behavior, Complex Systems, Biology,
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 Serf Distance Education Environment  Hofstetter, Univ. of Delaware
Serf stands for serverside educational records facilitator, a Webbased distance education environment that makes it possible to create and deliver courses in a selfpaced multimedia learning environment, enabling students to navigate a syllabus, access
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 Series Simulator  Doug Ensley, Shippensburg University
A program that allows you to use a random number generator to simulate a series
with parameters specified by you.
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 The Set Game Company  Set Enterprises Inc.
SetGame is a family game of visual perception. Take the Java tutorial; learn the math behind the game (create a 3x3 magic square with SET cards, learn why the largest possible "no set" contains 20 cards, explore set theory and set operations involved
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 SGBox  Singapore's Best Selection (TM)
Offers Singapore Math books, Singapore Math help, free games and resources
on education.
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 Shady Puzzles  LambdaMu Pte Ltd
A logic and elimination (disjunctive syllogism) puzzle: the column and row headers identify the number and spacing of shaded squares within a gridplace shaded squares where they belong according to those guides. The site includes a history of the puzzles,
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 Shape and Space in Geometry (Teachers' Lab)  Annenberg Media
This lab, based on the professional development series and workshops broadcast on the Annenberg/CPB Math and Science Project Channel, explores the properties of objects (angles, surfaces) and the consequences of how these objects are positioned (where
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 ShapeGame  Architectronics, Inc.
Drag shapes on, drag shapes off: triangles, squares, hexagons, rhombuses, and trapezoids. Also, change their color, orientations, and more.
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 SHAPES  XOX Corporation
Providing advanced C/C++ libraries and applets for application developers in GeoScience, CAE, CAD, Medicine, and other industries that require geometry and topology. Their primary product is Shapes®, a geometry system. Site offers contact and product
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 ShareMath  Scolab Inc.
Create, share, and remix mathematical equations on the web. ShareMath offers menus for layout, table, calculus, trigonometry, set theory, symbols, relation, and Greek letters. From the makers of AlfredEq, Alfred's Equation Editor.
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 Shedding Light on the Subject: Function Models of Light Decay (iMath Investigations)  Illuminations; National Council of Teachers of Mathematics (NCTM)
An online, interactive, multimedia math investigation in which students develop and analyze exponential models for the behavior of light passing through water. Accompanying video clips show the iMath in action in real classrooms.
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 The Shikaku Room  Paul Hutchinson
Given a few numbered squares in a larger grid, block out rectangular and square sections so that each component piece contains the one number that represents its area. Randomly generate or create your own grids — from 4 × 4 up to 20 ×
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 Shmuzzle Puzzle  Sam Savage
Inspired by M.C. Escher's famous tessellation drawings, these salamanders interlock in multiple ways. Physical and online puzzles, a contest, history of the shmuzzle, resources for teachers, and other shmuzzle products.
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 A Short Course in Trigonometry  David Joyce; Dept. of Mathematics & Computer Science, Clark University
An introduction and a guide to trigonometry, with hints and answers to exercises, and Java applets as illustrations. Contents include applications of trigonometry, angle measurement, chords, sines, cosines, tangents and slope, the trigonometry of right
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 Show N Tell Multiplication Table Tutor  Sheela Belur
Audiovisual practice in the multiplication tables. For Internet Explorer on Windows only.
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 ShowTheMath.org  Alan Degener
Enter an algebra equation and then solve it, step by step  manually: use the pulldown menu to describe steps as combining like terms, distributing, expanding, factoring, adding to both sides, subtracting from both sides, dividing both sides, multiplying
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 Sierpinski Shapes  Rick and Donna Joi
An interactive Java applet that allows you to create hundreds of fractal shapes using a variation of the Sierpinski triangle algorithm. Includes a page that provides a nontechnical explanation (with pictures) of the fractal math.
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 Sieve of Eratosthenes  Interactive mathematics Miscellany and Puzzles, Alexander Bogomolny
Sieve of Eratosthenes with an interactive Java illustration. A slight
modification of the Eratosthenes' algorithm leads to a different sieve
that leaves out square numbers. The latter is also accompanied by a Java
illustration.
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 Signing Apps  Vcom3D
Illustrated, interactive 3D sign language dictionaries and pictionaries. Vcom3D developed the Signing Math Dictionary (SMD), Signing Math Pictionary (SMP), and other apps for Deaf or HardofHearing students who use American Sign Language (ASL) or Signed
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 Simeon's World of Magic  Bob Fay
Interactive card tricks on the Web. Pick a card; whisper it out loud; Simeon will always remove it on the next page.
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 Simple Online Tools  Solvid
Unit and currency converters, calculators, a random number generator, and more.
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 Simplex Place  Moshe Sniedovich; Dept. of Mathematics & Statistics, Univ. of Melbourne
An introductory discussion of the Simplex Method used in linear programming problems, with a JavaScript "Simplex Machine" for you to experiment or solve a problem with. Also check out the DP Virtual Studio for a variety of wellknown dynamic programming
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 Simulating Probability Situations Using Box Models (iMath Investigations)  Illuminations; National Council of Teachers of Mathematics (NCTM)
An online, interactive, multimedia math investigation. Investigations that allow students to explore the relationship between theoretical and experimental probabilities are important in the study of probability and statistics. A "box model" can help students
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 Simulations & Demos  Rice Virtual Lab in Statistics
An integrated set of simulations, demonstrations, and case studies from the Data Analysis Lab (choose statistical analyses: Descriptive; Histogram; Boxplot; Stem and Leaf; ttests; Correlation and regression; ANOVA). Simulations include Java applets that
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 SISA: Simple Interactive Statistical Analysis  Daan Uitenbroek
SISA is a collection of procedures for performing simple statistical calculations online, using HTML Forms. SISA's statistical tools include statistical procedures: (sequential probability, ratios, ttest, Fisher exact, two by two table, ordinal tests,
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 SketchAndCalc™
On interactive graph paper, sketch straight lines by clicking the pencil icon — or curved ones by selecting the fountain pen nib — then login to calculate the area and perimeter of the shapes constructed. The gear icon in the upperright corner
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 Skillswise  BBC Online
Factsheets, worksheets, quizzes, and Flash games on whole numbers; measures, shape and space; fractions, decimals and percentages; and handling data. Resources for tutors include lesson plans, printable tracking sheets, a newsletter, and an expert column
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 Skimming A Century of Calculus  Cut the Knot!, Alexander Bogomolny
A comprehensive effort is under way to modernize instruction in undergraduate mathematics. In the November issue of the FOCUS newsletter, MAA has announced a twoyear $900,000 grant from the NSF to construct the Mathematical Sciences Digital Library (MATHDL).
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 Sliders  Cut the Knot!, Alexander Bogomolny, with Don Greenwell
A variation of the Fifteen puzzle invented by Sam Loyd in the early 1870's: puzzles on graphs, including a proof independent of Wilson's theorem that all Lucky 7 permutations are possible; and variations of Sliders, a Fifteenlike puzzle that can be played
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