 Sudoku  Pappocom, aka Wayne Gould
Finish filling in the 9x9 grid so that every row, every column, and each of the nine 3x3 boxes contains the digits 1 through 9. Different from a magic square, this puzzle requires no arithmetic, only reasoning and logic to deduce which digit to put where.
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 Sudoku  PedagoNet
Sudoku online. New puzzles generated regularly; archive of past puzzles.
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 Sudoku Shuffle  ridiculopathy.com
Play a Flash version of Sudoku online or print out one of these logic puzzles. Choose a level of difficulty and whether to play with number tiles or letter tiles.
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 A Su Doku solver
Solvers for sudoku puzzles, with documentation, source code, and binaries. Frequently asked questions about this numeric puzzle include "Su Doku" or "Sudoku"? How does the solver work? How do I compose a Su Doku problem? How few cells could appear on
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 Sudoku Squares and Chromatic Polynomials [PDF file]  Agnes M. Herzberg and M. Ram Murty
"Have you ever been trying to solve a Sudoku puzzle and been gripped by a sinking feeling that maybe you were stuck with a lemon? That maybe the puzzle you are struggling with actually has no solution at all? And, if you do find a solution, how can you
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 Sudoku Widget  Brian DeBoer
Macintosh OS X users familiar with Dashboard use its miniapplications to perform common tasks and get fast access to information. The Sudoku Widget by Brian DeBoer generates random puzzles with four different levels of difficulty, has the option to show
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 Suffolkmaths.co.uk  Mark Greenaway
Greenaway hosts a select collection of thirdparty resources in the public domain, many drawn from the UK's Department for Education (DfEs): teaching materials for Great Britain's different grade levels; problem solving documents on problemsolving strategies,
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 SUMaC  Math Camp  Stanford University
A residential summer camp for mathematically talented high schoolers, especially students who are in academic environments that do not offer the framework to excel in mathematics beyond the usual school curriculum.
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 SumBlox  Dave Skaggs and Kelly Threadgill
"The higher the number, the taller the block." The height of these wooden building blocks for each of the integers 110 represents their value. Vertically stacking different numbers to identical heights reveals the equivalence of number families; piling
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 Sumdog  Peter Beckham, Crocodile Clips Ltd.
Free multiplayer maths games designed to improve numeracy for students aged
913. Players compete either against the computer or other students around the world. The one hundred available games, which adapt to the skill level of each student, range
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 Sumizdat Home Page  Sumizdat
Website of the publisher "Sumizdat", currently featuring the English translation of a classical Russian geometry textbook: Kiselev's Geometry/Book I. Planimetry, Kiselev's Geometry/Book II. Stereometry, and Arithmetic for Parents, translated from the
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 SUMMA: Strengthening Underrepresented Minority Mathematics Achievement  Mathematical Association of America (MAA)
A program intended to increase the representation of minorities in the fields of mathematics, science and engineering and improve the education of minorities. Information about the program, its contributors and projects. Includes a database of biographies
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 Summer Calculus Institute  The Calculus Consortium for Higher Education (CCHE)
A three day institute held at Catholic University (Washington, DC) that disseminated to secondary schoolteachers the pedagogy and resource materials necessary to implement the philosophy of reform calculus in their own classrooms. Within a workshop environment,
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 Summer Institute in Mathematics for Undergraduates (SIMU)  University of Puerto Rico  Humacao
A sixweek research program in the mathematical sciences for undergraduate sophomores, juniors and seniors from across the U.S. and Puerto Rico. SIMU is designed for Chicano/Latino and Native American undergraduates, the populations served by the Society
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 Summer Math Camps and Programs for High School Students (AMS)  American Mathematical Society
A listing of titles, locations, and links of summer programs that provide high school students experience in the world of mathematics research.
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 Summer Mathematics Program for Women Undergraduates  Carleton/St. Olaf Colleges
An NSF/NSA funded program to encourage and support women in their study of mathematics. Goals include: introducing students to new areas of mathematics; honing students' mathematical reasoning, proof writing, problem solving, and presentation skills;
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 Summer Program for Women in Mathematics  Dept. of Mathematics, The George Washington University
A fiveweek intensive program for mathematicallytalented undergraduate women who are completing their junior year and may be contemplating graduate study in the mathematical sciences. Goals of this program are to communicate an enthusiasm for mathematics,
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 SummerSchoolMath
Math computation resources for children to practice math facts either as a school year supplement or summer "mathloss" preventer. Onepage, 100problem addition, subtraction, multiplication, and division worksheets utilize "the timetested principle
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 Summer Workshops for Math Teachers  Henri Picciotto
Information on workshops to come and links to previous syllabi, with handouts.
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 Sum of squares  Dario Alpern
An applet that decomposes any integer number up to 1000 digits long into a sum of four or less perfect squares.
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 SUMS Online Mathematics  SUMS ONLINE Limited
Eighty core activities in handling data, shape and space, calculations, and numbers. Trial sample activities in the playground: Fraction Monkeys, Bracket Basics, Fruit Picker (angle rotation), Place Value Darts, Hidden Craft (grid positioning), Division
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 SumTree Order of Operations Calculator  Martin Bradley
SumTree is a shareware program designed for parents and teachers as an educational tool which will interest children in arithmetic and illustrate the correct order to work out sums.
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 Sundry Algebraic Geometry and Commutative Algebra Sites  B. Harbourne
A list of links to personal home pages of mathematicians working in algebraic geometry.
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 Suntex First in Math  Suntex International Inc.
Play sample games of 24 online for free, or purchase a site subscription and register for access to a full range of interactive 24 games. Learn more about First in Math classroom kits, school kits, and the McDonald's restaurants First in Math League.
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 Super Bowls and Stock Markets  Ivars Peterson (MathTrek)
The Super Bowl "theory" links U.S. stock market performance to the results of the championship football game held each January since 1967. It holds that if a team from the original National Football League wins the title, the stock market
increases
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 SuperKids Educational Software Review  Knowledge Share LLC
Reviews of educational software in many categories, including math (see Math Software For Young Students and Math Software II). Reviews are comprehensive, including information about price and product support as well as general usability issues. A Math
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 SuperKids Math Worksheet Creator  SuperKids Educational Software Review
Make your own math drill worksheets: select the type of problem (addition, subtractions, multiplication, division, fractions, greater/less than), the maximum and minimum numbers to be used in the problems, click on the button, and a worksheet will be
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 SuperKids Review of Educational Algebra Software  Knowledge Share LLC
Reviews of the educational algebra programs: Astro Algebra, Grade Builder Algebra 1, Math Blaster Algebra, and Mathpert Algebra Assistant. Ratings based on educational value, kid appeal, ease of use, hardware requirements, and a buyer's guide (price comparison).
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 Superliminal  Daniel Green
Use the Tyler applet to create polygons of various sizes and attach them to edges of other polygons. Read about deltahedra, flexible polyhedra, and infinite polyhedra  figures made of an infinite number of polygons which would then fill all of space
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 Supermarket Math  Keith Devlin (Devlin's Angle)
Is it really possible to acquire skills  mathematical or otherwise  in a decontextualized fashion in a classroom setting, then make use of those skills in any reallife situation that may require them? The assumption that this is indeed possible is
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 Super Maths World  P. and R. May
Topicbased multiple choice assessment with a videogame feel. Yearlong subscriptions available for schools/districts, with a reduced rate for small schools and individual customers. Some activities are free to guests.
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 The Superstring Theory  Paul Hoiland
A site that gives a broad background from a mathematical point of view on general relativity, quantum mechanics, supersymmetry, and string theory. It also contains the concepts and math behind a registered modification to MTheory that is nonperturbative.
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 Supporting Cyber Students Over the Web  Philip Uys
Publications of Phillip Uys whose interests include open learning and distance education via the Internet and intranets ie networked education and its application. Papers include: "Supporting Cyber Students Over The Web: The Online Campus of Massey University
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 Supporting ELLs in Mathematics  Stanford University
Materials that illustrate how Common Corealigned math tasks can support math instruction and language development for English Language Learners (ELLs) in elementary, middle, and high school. Learn about the development of this material from Stanford
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 Supporting SenseMaking and Perseverance  Suzanne Alejandre
Article about how the Math Forum's noticing and wondering not only values each learner, it "also works to engage all learners in finding their mathematical voice." Originally published in the March, 2013, issue of the CMC ComMuniCator, journal of the
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 Suresh Lala's Math Quizzes  Suresh M. Lala
This quiz blog contains questions in algebra, geometry and arithmetic, to test and reinforce math skills and applications.
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 Surface Area of a Cone  NASA Lewis Learning Technologies Project
What is the approximate surface area of a cone whose slant height is 6 inches and whose radius is 3 inches? A detailed answer is provided. From NASA's 9th Grade Math Proficiency Test.
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 The Surface Area of a Cylinder (SMILE)  Edwina R. Justice, Gunsaulus Academy
A lesson designed to teach students to relate the areas of one rectangle and two circles to the total surface area of a cylinder; relate the circumference of a circle to the base of the rectangular section of a cylinder; and to review the area of a circle.
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 The Surface Area of a Cylinder (Version 2.0) (SMILE)  Edwina R. Justice, Gunsaulus Academy
A grade 8 group activity that uses a phenomenological approach, teaching students to apply concepts to a problemsolving situation. From the Geometry and Measurement section of a collection of almost 200 single concept lessons by the Science and Mathematics
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 Surface Area of a Rectangular Solid  NASA Lewis Learning Technologies Project
What is the surface area of a rectangular solid whose length is 6 centimeters, depth is 5 centimeters, and height is 4 centimeters? A detailed answer is provided. From NASA's 9th Grade Math Proficiency Test.
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 Surface Distance Between Two Points of Latitude and Longitude  John A. Byers, United States Department of Agriculture  Agricultural Research Service
Enter the latitude and longitude of two points on Earth, and this JavaScript program returns the distance between the locations in kilometers, miles, and nautical miles. Similarly, calculate the great circle distances between over 300 cities. Download
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 Surface Plotter  Yanto Suryono
A Java applet that plots surfaces defined by explicit twovariable mathematical functions (i.e: z = f(x,y)). Surfaces thus plotted may be rotated in any direction.
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 Surfaces Beyond the Third Dimension  Thomas Banchoff
A site that documents an art exhibit hosted by the Providence, Rhode Island Art Club in 1996, featuring computergenerated artwork designed by Tom Banchoff in collaboration with Davide Cervone (now at Union College) and student associates at Brown University.
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 Surfaces (Geometry and the Imagination)  Conway, Doyle, Gilman, Thurston; The Geometry Center
A surface, or 2manifold, is a shape any small enough neighborhood of which is topologically equivalent to a neighborhood of a point in the plane. For instance, a the surface of a cube is a surface topologically equivalent to the surface of a sphere.
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 Surfing The Net with Kids: Math  Barbara J. Feldman
The author is a newspaper columnist who collects, reviews, and rates, and sorts by subject internet sites for kids. The site is searchable, and includes various subject areas, a weekly email newsletter, and items for parents and teachers.
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 Surfin' Sinefeld: Flash Animations for Precalculus, Calculus and Statistics  Ralph Irons
Animated graphing calculators for exponential, logarithmic, sinusoidal and
power functions and their derivatives; animated histogram for 5 data sets;
quizzes; Derivative Pong.
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 SURFSTAT australia  Keith Dear; National Centre for Epidemiology and Population Health, The Australian National University
An online text in introductory Statistics from the University of Newcastle. Contents: Summarizing and Presenting Data (Types of Variate; Presenting Discrete and Continuous Data; Charactistics of a Distribution; Measures of Central Tendency and Variability;
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 Survey of the Classes of 1997 Concerning Their High School Math Programs and How Well These Programs Prepared Them for College Math  Gregory F. Bachelis
A Bloomfield Hills School District (BHSD; Oakland County, Michigan) survey comparing the college performances of high school students with differing high school math programs, particularly in response to the the advent of the CorePlus Mathematics Project
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 A Survey of Venn Diagrams  Frank Ruskey; Dept. of Computer Science, Univ. of Victoria, B.C., Canada
Facts and figures about Venn diagrams, particularly as they relate to combinatorial properties of the diagrams: Who was John Venn? What is a Venn diagram? Formal definition of Venn diagrams; General constructions of Venn diagrams. Also Graphs associated
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 Surviving College Algebra  Eric Saunders
A book intended to simplify college algebra for struggling students.
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