 National Institute of Standards and Technology (NIST)  U.S. Department of Commerce
Working with industry to develop and apply technology, measurement, and standards. Links to a site guide; Measurement and Standards Laboratories; Advanced Technology Program; Manufacturing Extension Partnership; Baldridge Quality Program. Events, publications,
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 The National Numeracy Strategy  Department for Education and Employment, United Kingdom
The Standards Site: Numeracy. Frameworks for teaching mathematics from Reception through Year 7, key elements of the training materials that will support the U.K.'s Numeracy Strategy. Assessment in and planning the National Numeracy Strategy, schools
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 Newton, Sir Isaac (Funk & Wagnalls Multimedia Encyclopedia)  Lycos Zone: Mathematics
A short biography of Sir Isaac Newton (16431727), focusing on The Fluxional Method, Optics, and The Principia.
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 Number Glossary  Math Forum, Ask Dr. Math FAQ
What are abundant, amicable, deficient, figurate, happy, narcissistic, palindromic, perfect, polygonal, proper divisors, semiperfect, sociable, square, tetrahedral, triangular, and weird numbers?
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 Numbers from 1 to 10 in Over 4000 Languages  Mark Rosenfelder
Click on the map to move to the languages for that area, or select from: IndoEuropean, Dravidian, and minor European languages; AfroAsiatic, Caucasian, NiloSaharan, Kordofanian, and Khoisan languages; NigerCongo languages; Uralic, Altaic, Tai, AustroAsiatic
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 Numericana.com  Gérard P. Michon
The online companion of Numericana, this site contains excerpts from Michon's book, including the entire glossary of scientific terms. Browse an index with pithy summaries, browse by popularity, or search nearly two hundred of his "final answers" of readers'
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 Online Dictionary of Combinatorics  Joe Fields
An online dictionary of combinatorics by a doctoral student at the University of Chicago. The dictionary is navigable by letters of the alphabet, and contains a few illustrations. Entries range from Abelian to Zorn's Lemma, and include several resources
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 OnLine Encyclopedia of Integer Sequences  The OEIS Foundation Inc.
Before publishing that new sequence you have just found, you might want to check here to see if it's already been discovered. Directions for how to look up a sequence in the table, abbreviations used, sending in a new sequence; how to look up a reference
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 Online Math Courses  Internet Academy (IA)
Distance learning for high school students, who pay a fee and can obtain credit. Uses Academic Systems software (PC only, no Macs). See the Algebra III Index of Lessons. Includes a Glossary.
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 Online Math Help for All  Ramachandran Seerangan
Primers and problems, a math dictionary, worksheets organized by grade and concept, and more. See in particular Seerangan's YouTube channel, where he posts narrated whiteboard videos of stepbystep solutions to specific problems.
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 Oscience.info  Subash Chandra
Introductions to limits and continuity, derivatives and antiderivatives, functions and graphs, matrices and determinants, properties of triangles, set theory, basic trigonometric formulae, and trigonometric functions and identities. See also Oscience's
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 Phyllotaxis  Pau Atela, Chris Golé; Smith College
An interactive site for the mathematical study of plant pattern formation. Sections of the site include: Introduction to Phyllotaxis (classification, Fibonacci/golden angle, microscope, mathematical model, and lattices); history; glossary; references;
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 Platonic Solids  Buckley; Metropolitan School District of Pike Township, Indianapolis, IN
A demonstration of the construction of the five Platonic Solids from Book 13 of Euclid's Elements. Contents include: Prop 13  pyramid; Prop 14  octahedron; Prop 15  cube; Prop 16  icosahedron; Prop 17 dodecahedron; and a Glossary Of Terms.
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 Practical Money Skills for Life  VISA
For educators, parents and students to practice better money management for life. Available online or in a binder format, the free classroom curriculum consists of a teacher's guide, student worksheets and quizzes. Teacher's Guide lessons cover topics
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 The Precalculus Weblet  Dynamic Educational Materials
A partially online precalculus course with the following centers: Instruction (extending the instructional opportunities beyond the textbook; see Explore the Concepts and Starred Exercises), Reference (technology, glossary, history, sites that complement
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 The Prime Glossary  Chris Caldwell; Dept. of Mathematics & Computer Science, Univ. of Tennessee at Martin
A guide to the terminology of prime numbers, and links to other pages with fuller definitions and information, written on two levels: for schoolteachers and students to define the basic words of elementary prime number theory and list the unusual or curious
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 Project Interactivate  Shodor Education Foundation, Inc.
Interactive middle school lessons on number and operations, geometry and measurement, functions and algebra, and probability and statistics. They feature: online activities (illustrative Java applets including: Venn diagrams; clock arithmetic; Pythagorean
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 Properties Glossary  Math Forum, Ask Dr. Math FAQ
What is an operation? What is an identity? What are the associative, commutative, and distributive properties? What is the property of closure? What is the inverse of something?
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 Quadralay's Cryptography Archive  Quadralay Corporation
Encryption standards, frequently asked questions (FAQs), and newsgroups. Clipper, Digital Telephony, History of Cryptology, Internet Security, Kerberos, PGP, RIPEM, and a glossary.
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 Qu'estce qu'un nombre? Edoc Mathématiques  Service du Film de Recherche Scientifique (SFRS)
Site basé sur le livre de S. Houzel, qui retrace l'histoire du nombre depuis l'Antiquité. In French. Site based on the book by S. Houzel, retracing the history numbers.
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 Resource Room (Math Central)  University of Regina, Regina, Saskatchewan, Canada
French version: Centre de ressources. A service of Math Central that allows mathematics educators to share resources having to do with math teaching. Submissions are stored in a database that can be browsed by educational level and curriculum strand,
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 RSA Laboratories' Frequently Asked Questions About Today's Cryptography  RSA Laboratories
Cryptography FAQs organized into eight chapters: introduction, cryptography, techniques in cryptography, applications of cryptography, cryptography in the real world, laws concerning cryptography, miscellaneous topic, and further reading. With appendices
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 SACNAS Biography Project  Society for the Advancement of Chicanos and Native Americans in Science
Highlights of the life stories and professional contributions of Native American, Chicano and Latino scientists, mathematicians, and engineers. The Project was created so that K12 students could see themselves reflected in the stories of the lives that
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 SadlierOxford  William H. Sadlier, Inc.
From the publishers of the textbooks Progress in Mathematics and Math Alive at Home in Spanish, activities and vocabulary, a primary glossary, and an intermediate glossary.
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 Sciences exactes / Mathématiques  Encyclopédie Hachette Multimédia En Ligne
Recherche Mathématiques par thème: Mathématiciens et logiciens; Mathématiques générales; Logique; Algèbre; Topologie; Analyse; Géométrie; Cinématique; Statistiques; Probabilités;
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 SciPhilately: A Selective History of Science on Stamps  Maiken Naylor; Science and Engineering Library, Univ. at Buffalo, Buffalo, NY
Stamps from the personal collection of the author, Maiken Naylor, in the following categories: Astronomy and Cosmology; Instruments and Measurements; Mathematics and Computation; Chemistry; Evolution and the Fossil Record; Biology; Heredity and the Genetic
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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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 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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 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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 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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 State Institute of Statistics (SIS)  Republic of Turkey
The agency in charge of collecting statistics for the country of Turkey. Includes tables and charts of key social, economic, and environmental statistics and a dictionary of important statistics and economics terms arranged by subject. Some articles
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 Statistical Education through Problem Solving (STEPS)  STEPS TLTP Consortium
The STEPS consortium in the U.K. has developed problembased modules to support the teaching of Statistics in Biology, Business, Geography, (Windows) and Psychology (Windows and Mac). The software is freely available to educational institutions, and can
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 Statistics by Jim  Jim Frost
Statistics blog that dates back to February, 2017, with posts such as "The Monty Hall Problem: A Statistical Illusion"; "Statistics, Exoplanets, and the Search for Earthlike Planets"; "Statistical Analysis of the Republican Establishment Split"; "How
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 Statistics & Probability (Funk & Wagnalls Multimedia Encyclopedia)  Lycos Zone: Mathematics
Short articles on probability and statistics, covering: average, Babson, demography, mode, Neumann, probability, queuing theory, statitics, and vital statistics.
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 Stellated Icosahedra  Roman Maeder
An excerpt of an article published in Mathematica in Education. There are 59 stellations of the icosahedron; these pages contain various images of them, ordered by increasing circumradius, and some background information. The metric properties and graphics
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 Stephen's Guide to Logical Fallacies  Stephen Downes
Lists all known logical fallacies, with definitions, examples, and the steps needed to prove that the fallacy is committed. Site also includes links to logic references and resources.
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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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 TeacherNet  Highlights for Children
A network of K12 educational materials vendors and teachers: Teachers' Lounge (with email list and online bulletin board); Teaching K8 (a monthly publication with articles available online); ZanerBloser (handwriting, spelling, reading and vocabulary,
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 Teaching and Learning About Decimals  Steinle, Stacey and Chambers; Univ. of Melbourne, Australia
A resource for teachers that explains the mathematical, psychological and pedagogical ideas needed to teach students to work confidently with decimal numbers. Contents include: Background (main ideas, what learners find hard); Case Studies (video interviews
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 Teaching Ideas for Primary Teachers: Maths
Math activities for ages 511 include a puzzle display, shapes worksheets, ideas for making a maths dictionary, a questioning technique, and many more games, worksheets, and activities for the classroom.
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 themathlab.com
Playful, interactive studentmade problems, games, drills, lesson ideas, tools, "magic," and more. Lessons include practice problems which, when solved correctly, generate passwords that grant access to "treasure rooms." Lesson ideas include Algebachee
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 Tiling Plane and Fancy  Steve Edwards
The 17 wallpaper groups identify the plane symmetry groups and link to background patterns illustrating them. Tiling Definitions define, with examples, the terms fundamental region, isohedral tiling (isohedral and nonisohedral), isogonal tiling, lattice,
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 Tim's Triangular Page  Alex Sakharov
Information, definitions, and illustrations of triangles, their parts, and congruency. Includes a few min/max problems relating to triangles at the end.
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 Topological Space: Definition and Basic Theorems  Michal Wojcik
This page contains the definitions of the following concepts: topological space, open set, closed set, interior, closure. Contains the most basic theorems about these concepts together with an easytoread proof which is slightly informal in some places.
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 The Topological Zoo  The Geometry Center
For mathematicians and educators: a visual dictionary of surfaces and other mathematical objects, consisting primarily of movies, still images and interactive pictures. Can be used to complement classroom presentations, research papers and talks. Each
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 Topology Atlas  Shakhmatov and Watson; York University, Toronto, Ontario, Canada
A multipurpose center for electronic distribution of information related to topology, the mathematical study of surfaces, sometimes called "rubber sheet geometry" because topologists consider geometric figures as though they were drawn on infinitely
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 Totally Tessellated  Bhushan, Kay, & Williams
A comprehensive introduction to tessellations and tilings  the basic underlying mathematics and examples of tessellations in real life. The highly illustrated, printerfriendly site includes history (tessellations in mathematics and science, decorative
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 The Uniform Polyhedra  Roman Maeder
A shortened version of the notebook Polyhedra.ma from Illustrated Mathematics [Gloor/Amrhein/Maeder95]. Uniform polyhedra have regular faces and congruent vertices. Allowing for nonconvex faces and vertex figures, there are 75 such polyhedra, as well
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 VIAS Encyclopedia  Hans Lohninger, Virtual Institute of Applied Science
An online encyclopedia of science topics, with a Mathematics section as well as a German/English dictionary.
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 Views of the Solar System  Calvin J. Hamilton
A multimedia exploration of the Sun, planets, moons, comets, asteroids, meteorites, and more. Study the latest scientific information or the history of space exploration, rocketry, early astronauts, space missions, and spacecraft through an archive of
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