 SmartTutor.com  SmartTutor.com
SmartTutor.com offers online K5th grade reading and math lessons. Math instruction includes number sense and operations, measurement, and geometry. The program begins with an evaluation of the child's skills followed by an individualized curriculum developed
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 SmartZoid
SmartZoid provides online math evaluation and tutoring with a comprehensive free assessment for grades K9.
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 SMath Studio
SMath Studio is a free software application with a WYSIWYG interface similar to MathCAD. Also available in Russian.
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 SMILE Program Mathematics Index  Science and Mathematics Initiatives for Learning Enhancement
Over 200 singleconcept lesson plans in the following categories: Geometry and Measurement, Patterns and Logic, Probability and Statistics, Recreational and Creative Math, Practical and Applied Math, Arithmetic, Graphs and Visuals, Algebra and Trigonometry,
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 Séminaire Lotharingien de Combinatoire
An electronic journal on combinatorics. Abstracts of the papers are available online, and the full articles can be downloaded.
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 Séminaire Lotharingien de Combinatoire  Institut für Mathematik, Universität Wien, Vienna, Austria
A joint seminar in Combinatorics for the Universities of Bayreuth, Erlangen and Strasbourg, as well as the other Universities along the Lotharingian boundaries. The Seminar hosts an international electronic journal carrying the same name, with abstracts
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 Smithsonian Institution
An independent trust instrumentality of the United States holding some 140 million artifacts and specimens in its trust for "the increase and diffusion of knowledge," and a center for research dedicated to public education, national service, and scholarship
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 Smithsonian Institution Traveling Exhibition Service (SITES)
"The Smithsonian in your state." Each year, millions of people in more than 250 venues beyond Washington, D.C. visit SITES exhibitions on view in local museums, libraries, science centers, historical societies, aquariums, community centers, and schools.
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 Smith's Stuff: Resources  Mark Smith
Mark Smith shares resources that he has created as a high school teacher: games, mnemonics, activities, sketches, and more. Sign up for a free account if you'd like to share activities here as well.
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 Snap Math  John and Eva McKendrick; Teilhard
A version of the children's game, but to win the cards, you have to do the math. Click on the pack at the left to start; when your card matches the computer's card, you are set a series of math problems. If you answer correctly, you win the cards.
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 Snow Activities  The Teel Family
A site that includes snow science (how to study snow crystals) and snow art (cutting sixsided paper snowflakes and a "selfsticking" snowflake).
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 Snow Day Calculator  David Sukhin
Enter a ZIP code and number of school days already canceled there due to inclement weather, and the Snow Day Calculator predicts the probability of an early dismissal or no school the following day. Sukhin originally developed his predictive calculator
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 Snowdays  Popular Front
Make your own snowflakes online: point and click to cut anywhere around or inside the folded piece of virtual paper. Preview the unfolded results in real time; when ready, save your design to the searchable gallery, where you may view and download plans
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 The Snowflake Curve, Perimeter and Area  Don Cohen (The Mathman)
Young children start with an equilateral triangle, then go 1/3 of the way along each side, then add a smaller equilateral triangle, protruding out from every side to get the next figure. A sample problem with answers from Chapter 4 of Don Cohen's worksheet
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 Snowflakes and Stars  Ignacio Dayrit
Graphic images of snowflakes with folding instructions to make from paper.
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 Snowflakes  Kenneth G. Libbrecht
"Your online guide to snowflakes, snow crystals, and other ice phenomena." Snow activities include instructions for using everday objects and dry ice to make your own snowflakes; for using glue to make plastic snowflake replicas ("snowflake fossils")
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 SNOW Kids  Centre for Academic Technologies, University of Toronto
Special Needs Opportunity Windows (SNOW) is a pilot project aimed at developing ways for children with special needs to access curriculum materials electronically. The Library has children's books and magazines in English and French, a video room, and
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 Soap Bubbles  Ron Hipschman; The Exploratorium
Why does a bubble form a sphere? Why not a cube, tetrahedron, or other geometrical figure? This site from San Francisco's Exploratorium provides information on the shape of bubbles and what happens when bubbles meet, with formulas for longlife bubble
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 Soap Film Models (SMILE)  Joan Pintozzi, Curie Metro. High School
A lesson designed to encourage students to conjecture, introducing the concept of minimum path and minimum surface area and practicing measurement of line segments and angles. From the Geometry and Measurement section of a collection of almost 200 single
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 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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 Social Actuary  Social Actuary
The Social Actuary community allows actuaries to: create a user profile; connect with other actuaries around the world to discuss exams, study habits, careers and much more via the Forums; display exam and destination progress via user profile; create
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 Social and Historical Aspects of Mathematics  Thompson, Wilkinson; Univ. of Wolverhampton (UK)
Math history: the development of counting systems and notations (includes Egyptian, Sumerian, Babylonian, and HinduArabic numerals); of notation and concepts in algebra; Changing systems of geometry from Euclid to Klein's programme (includes New Geometries,
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 Sociedade Portuguesa de Matemática (SPM)
Portuguese Mathematical Society. Periodicals, monographs, events, membership information.
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 Societat Catalana de Matemàtiques  L'Institut d'Estudis Catalans
The Catalan Mathematical Society. Barcelona 2000, the Third European Congress of Mathematics, and World Mathematical Year 2000.
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 Society for Advancement of Chicanos and Native Americans in Science (SACNAS)
The mission of SACNAS is to encourage Chicano/Latino and Native American students to pursue graduate education and obtain the advanced degrees necessary for research careers and science teaching professions at all levels. Their Biography Project, for
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 Society for Chaos Theory in Psychology & Life Sciences
An association of researchers and practitioners interested in applying dynamical systems, chaos, and complexity theory to psychology and the life sciences. Joining the society; contents and submission information for the journal Nonlinear Dynamics, Psychology,
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 Society for Industrial and Applied Mathematics (SIAM)
SIAM was founded in 1951 to advance the application of mathematics to science and industry, promote mathematical research that could lead to effective new methods and techniques for science and industry, and to provide media for the exchange of information
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 Society for Mathematical Biology
A forum for discussion of research in biology, mathematical biology, and mathematics applied to or motivated by biology  interdisciplinary research such as biophysics, computational biology, and many other similar realms. Information on membership and
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 Society for Nonlinear Dynamics and Econometrics  Bruce Mizrach
The Society seeks to promote the use of nonlinear methods in economics and finance from both a theoretical and empirical perspective. Call for papers; programs of past symposia; Journal (Studies in Nonlinear Dynamics and Econometrics  abstracts and bibliographies
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 Society for Risk Analysis (SRA)
A multidisciplineary, international open forum for those interested in risk analysis, broadly defined to include risk assessment, characterization, communication, management, and policy. Interests include risks to human health and the environment, both
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 Society for Special Functions and their Applications (SSFA)  S. Ahmad Ali
A group based in India which exclusively caters to and coordinates research activities in this branch of analysis. The Society has interaction with the SIAM Activity Group  SIAM OPSF. Under the agreement the permission has been granted to SSFA, India
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 Society for Special Functions & their Applications, India
Publications, links, and conferences of the society. The main objectives of the Society are: to promote basic research in the field of Special Functions and their application in other areas of mathematics and in Science and industry; to encourage and
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 Society of Actuaries
Actuaries are professionals trained in mathematics, statistics, and economic techniques that allow them to put a financial value on future events. This skill is of great value to insurance companies, investment firms, employee benefits consulting firms,
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 Society of Manufacturing Engineers (SME)
The premier source of learning and knowledge for the manufacturing community. An international professional society dedicated to serving its members and the manufacturing community through the advancement of professionalism, knowledge, and learning. Founded
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 Society of Young Mathematicians  SYMs
A UK organization that motivates and encourages "all young people who enjoy mathematics." SYMS publishes articles, news, "things to do," calculator hints, book reviews, games, puzzles, and competitions in its newsletter, SymmetryPlus, and termly journal,
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 Sociological Foundations Supporting the Study of Cultural Diversity  Hugh Mehan, Univ. of California at San Diego
In order to understand the barriers to educational equality faced by lowincome cultural and linguistic minority youth, we need to understand the ways in which social class and ethnicity interact with language and culture. This paper examines various
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 The Socratic Method: Teaching by Asking Instead of by Telling  Rick Garlikov
An example and explanation of how to use students' (including young children's) inherent reasoning abiltiy to guide them gently and easily into an understanding of difficult ideas.
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 Soddy's Formula  Pat Ballew
Descartes' Circle Theorem, an example of giving the credit to the wrong person. The formula is about the relation of the radii of four mutually tangent circles and is sometimes called the Kissing Circles Theorem: if four circles are all tangent to each
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 Sofist India  Sofist India
A software company that specializes in developing offtheshelf products and components (assemblies) using Microsoft .NET technology. The company also develops and maintains software packages and develops web sites. Its expertise lies in the fields of
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 Soft Mathematics: The Mathematics of People  Keith Devlin
Keith Devlin describes the blending of mathematics with other disciplines, an approach that is increasingly being adopted in the study of people and their actions.
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 Softmath  Neven Jurkovic
Developers of Algebrator, an automated tutor based on Maxima CAS that provides stepbystep solutions to algebra, trigonometry, and statistics problems, and exports answers to MathML. Demo and purchase Algebrator; use Softmath's free online software to
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 Softronics Inc.: An Educational Software Company
MMLogic: A MultiMedia Logic Design System (free fully functional trial version available); MSWLogo: A free Educational programming language that brings Windows and Logo together, now supporting 3dimensional geometry.
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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 and Animations (The Geometry Junkyard)  David Eppstein, Theory Group, ICS, UC Irvine
An extensive annotated list of pointers to specialized software, Java applets, video sequences, and other forms of interactive or animated geometry.
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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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 Software by Al Jarnow  ProtoZone Interactives
Webbased interactive software excerpted from pattern exhibits at the Long
Island Children's Museum, the National Museum of Science and Industry (London),
and the Brooklyn Childrens's Museum. Introductions to art and math with many patternmaking
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 Software Carpentry  Software Carpentry
Basic computing skills for scientists through selfpaced online instruction or short, intensive workshops ("boot camps" at universities and research facilities in the US, UK, and Canada). See, in particular, the free outlines and video lectures on MATLAB,
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 Software Development  Dept. of Mathematics, University of Arizona
A page with links to mathematical and graphics packages developed within the University of Arizona Mathematics Department. Researchrelated and instructional software, with packages related to computer algebra and raster graphics; vector graphics and
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 Software for Algebra and Geometry Experimentation  William Stein et al.
Free and open software for researching and teaching algebra, geometry, number theory, cryptography, and more. SAGE performs group theory and combinatorics (using GAP), symbolic computation and calculus (Maxima), commutative algebra (Singular), number
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 Software for Graphics and Data Analysis  S. Baum; Dept. of Oceanography, Texas A&M University
Links to software with descriptions, features, and where to find it, in (mostly) the following categories (or check out the complete alphabetical list): mostly graphics; mostly numerical analysis and number crunching; mostly data formats; commercial packages;
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