 Significant Figures/Digits  Math Forum, Ask Dr. Math Common Question
A selection of answers to questions about scientific figures and scientific digits, such as "When are zeros significant and when are they not significant?"
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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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 Signing Science  National Technical Institute for the Deaf, TERC, Vcom3D
Along with the animated sign translator Sign Smith Player, SigningAvatar signs text in American Sign Language (ASL) or Signed English (SE). This research project plans to evaluate the extent to which the addition of signing promotes achievement of specific
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 SI Guide  James R. Frysinger
SI (International System) measurements and quantities, with pages for: a basic starter set of units and prefixes; the unit compendium (a more complete list); the prefix compendium (a complete list); rules on usage (spelling, capitalization, spacing, plurals,
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 SimCalc Curriculum  James J. Kaput, Principal Investigator; Simulations for Calculus Learning
The SimCalc Project aims to democratize access to the Mathematics of Change for mainstream students. How the math of change can contextualize and organize many other important ideas already in the curriculum, moving to a strands structure that allows
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 SimCalc Library  James J. Kaput, Principal Investigator; Simulations for Calculus Learning
Papers and other writings on the SimCalc Project, which aims to democratize access to the Mathematics of Change for mainstream students: "Learning the Basics with Calculus"; "An introduction to the profound potential of connected algebra activities:issues
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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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 Simtel.Net  Digital River, Inc
A distribution network for shareware, freeware, and public domain software. Browse or search for programs running on the platforms of Windows 95/98, DOS, or Windows 3.x. Windows 95/98 mathrelated programs range from abacus instructional packages to an
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 Sine of the Times: Dividing the Universe by Zero  Colin Graham
A collection of thoughts on math by an "eternal student" with an "eclectic educational background." Posts, which date back to June, 2010, have included "Creative ways of integrating more water in the body," "My first online manipulative  virtual origami,"
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 The Singapore Math Coach  Tricia Salerno
Problems of the week based on the Singapore math approach. Students with correct answers can see their names on the web. Site includes some program information as well.
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 SingaporeMath.com Inc.
Formerly "Family Things," this family business located in Oregon, USA provides information, sample pages, and ordering information for the Singapore mathematics and science curricula, with sample placement tests for the New Elementary Math Series, sample
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 Singapore Math  Yan Kow Cheong
News and updates on Singapore Math from Cheong, a math coach, writer, editor, and life member of the Singapore Mathematical Society (SMS) and the Association of Mathematics Educators (AME) whose author credits include "Mathematical Quickies & Trickies."
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 singingbanana.com  James Grime
YouTube videos, "lazy microblog," and social networking hub of Enigma Project Officer James Grime, who "hopes to explain to kids and general audiences why he love his maths so much, to challenge some of the public's misconceptions, and to explain why
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 SINUS transfer  University of Bayreuth
Spurred by the outcome of the Trends in International Mathematics and Science Study (TIMSS), Germany launched a nationwide "model programme for increasing efficiency in mathematics and science education." Between 1998 and 2007, more than 1800 of the
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 Sites with Problems Administered by Others  Math Forum
Problems of the week or month: a page of annotated links to weekly/monthly problem challenges and archives hosted at the Math Forum but administered by others, and to problems and archives elsewhere on the Web, colorcoded for the level(s) of the problems
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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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 Sketch Exchange  Key Curriculum Press
Share Sketchpad activities, tips, questions, and ideas in this online community dedicated to the dynamic geometry software. Browse sketches by grade level, topic, or tags.
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 SketchMad  Nathalie Sinclair
An archived resource, not currently updated: A resource center devoted to using The Geometer's Sketchpad in the classroom. Includes tips, strategies, lesson plans, and sketches for beginning and intermediate Sketchpad teachers, stories from the classroom
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 Sketchpad for Little Ones  Geri AndersonNielsen; Georgetown Day School
The Geometer's Sketchpad (GSP) is a powerful tool for discovering geometric properties. The program contains a ruler, a protractor, a calculator, and a simple word processor, in addition to graphing possibilities for the Cartesian plane. The activities
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 Skills and Competencies Needed to Succeed in Today's Workplace  NCREL: North Central Regional Educational Laboratory; Learning Point Associates
Because the world of work is changing, the U.S. Departments of Labor and Education formed the Secretary's Commission on Achieving Necessary Skills (SCANS) to study the kinds of competencies and skills that workers must have to succeed in today's workplace.
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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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 Slates, Slide Rules, and Software: Teaching Math in America  Smithsonian National Museum of American History, Behring Center
An exhibit on mathematics teaching devices from the Smithsonian's National Museum of American History, focusing on innovations in mathematics teaching from the blackboard to graphing calculators and computer software.
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 SlideARound Math Manipulatives  Jim Franklin
These manipulatives feature movable, interchangeable slides for learning how to round whole numbers, decimals, and money; to identify equivalent fractions; to calculate elapsed time, and more. Manufactured in the U.S. of recycled plastic with steel reinforcement,
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 Slinky Science  National Engineers Week Committee
Classroom activities include Racing Slinkys, which describes how inertia, gravity, potential energy, kinetic energy, and longitudinal waves are demonstrated when the Slinky "walks" down stairs or an incline; Slinky Waves, which outlines how Slinkys exhibit
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 Sloan Digital Sky Survey
The astronomical surveys of the Sloan Digital Sky Survey (SDSS) have "obtained deep, multicolor images covering more than a quarter of the sky and created 3dimensional maps containing more than 930,000 galaxies and more than 120,000 quasars." SDSS's
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 Small Group Interactions (Learning and Mathematics)  Susan Bobbitt Nolen; Math Forum
In this 1991 article, "Smallgroup interactions as a source of learning opportunities in secondgrade mathematics," Yackel, Cobb, and Wood, of Purdue University Calumet, Vanderbilt University, and Purdue University, respectively, describe an experiment
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 SMARTBoard MiniMovies  Jamie Tubbs
Enhance your SMARTBoard Notebook presentations with these minimovies, which are simple Flash animations. Minimovie topics include: Alphabet Geometry (angles, similar figures, symmetry, transformations, tessellations), Everything Geometry (geometry basics,
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 SmartBoardWiki  Tangient LLC and wiki participants
SmartBoardWiki is a venue where teachers can read, discuss, and increase their experience with SmartBoard technology. Sections include: Hardware FAQs, PD Materials, SMART Use Checklist, Lesson Creation, Advanced Integration, Teacher Notebook Lessons,
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 SMART Catalog  Science and Math Advancement and Resources for Teachers (SMART)
A searchable list of professional development and resource providers for mathematics, science, and technology, organized alphabetically or according to the California Math and Science Frameworks. Articles spotlight professional challenges and successes.
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 Smartkiddies Mathematics  Andy Hobeika
Free interactive lessons, number challenge exercises, worksheets  and visual reporting for instant feedback. To begin, select a year (one through seven, corresponding to Australia's curriculum), then a module, ranging from whole number to position &
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 Smartkiddies Mathematics  Smartkiddies Mathematics
Video lessons, interactive activities, maths games, number challenge drills, worksheets, assessments. Developed by experienced Australian teachersall content is based on the Australian curriculum. Free to all schools and teachers during school hours;
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 SMART: Science and Mathematics Advancement and Resources for Teachers  Los Angeles Educational Partnership
A program designed to help teachers in Los Angeles County (California, USA) develop their professional teaching skills and content knowledge. Links for Teachers, Students, Businesses and Institutions, Parents, and Community Members. Includes the SMART
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 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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 Só Matemática  Só Matemática
Material para ensino fundamental, médio e superior, além de provas online, biografias de matemáticos, trabalhos de alunos, um acervo de softwares matemáticos, artigos, jogos, curiosidades, histórias, fóruns de
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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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 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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 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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 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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 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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