 Juniorszone
A provider of online primary school education offering literacy, numeracy keystage2 strategy based on the UK national curriculum. Areas include e learning, educational games, interactive learning, brain teasers, homework help, and free online tutorials.
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 Just a Usual Day at Unusual School (MegaMath)  Nancy Casey; Los Alamos National Laboratory
Students perform a play that takes place in a school where some of the students always lie and the rest always tell the truth. Terry, the protagonist, is trying to find out which students are which, but at the beginning, there is no way of knowing whom
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 JustMaths  Seager, Christian; Khawaja, Faisal; Muldowney, Melanie
Video tutorials, practice exam questions, and other intervention resources created by three teachers practicing in the UK Midlands. Free resources include "trumps" and exam questions in algebra, data handling, geometry and measure, number, and more. Blog
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 Just Math Tutoring  Patrick Jones
Supplemental math education for the areas of Austin, TX and Nashville, TN. Covering algebra through collegiate math topics, including test preparation.
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 Just Tell Me the Answer  "Never!"  Matt Owen
Blog by an algebra and physics teacher who believes students "have a real chance at understanding if I'm just willing to let them struggle." Posts, which date back to August, 2012, have included "Answering 'the Question,'" "Flipclass Reflections So Far,"
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 Just What I Asked For
A kidsafe site designed to make it easy to find highquality resources on
the Web. Look for math under Education.
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 K12ASSESSL Mailing List
The goal of K12ASSESSL is to provide educators with a fast, convenient, and topical electronic discussion forum focusing on issues related to educational assessment in grades K12. It is hoped that K12ASSESSL will become the place for local assessment
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 k12.ed.math  Math Forum
A moderated discussion forum for K12 mathematics issues such as curriculum, assessment, classroom practices, suggested assignments, help on particular problems, grading practices, requests for advice, history of mathematics, etc. Messages are reviewed
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 K12 Educational Outreach Activities  National Optical Astronomy Observatories (NOAO)
Program highlights include The Use of Astronomy in Research Based Science Education, a proposed teacher workshop on using data in the classroom; products include Frequently Asked Questions about Being an Astronomer (a Spanish version of this FAQ is also
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 K12 Geometry  Math Forum
Links to some of the best Internet resources for geometry: classroom materials, software, interactive materials, Internet projects, and public forums for discussion.
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 K12 Internet Algebra Resources  Math Forum
Classroom materials, algebra software online, Internet projects, and discussion groups where mathematicians, teachers, and students trade ideas about algebra.
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 K12 Math  BTRware.com
Math concepts, subjects, exercises, and examples for grades K through 12.
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 K12 Mathematics Curriculum Center (MCC)  Education Development Center, Inc. (EDC)
This NSFfunded K12 Mathematics Curriculum Center assists school districts as they select and implement standardsbased mathematics curricula. It provides a series of seminars, resource guides, cases and other written material, referrals, and phone consultations
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 K12 Math Problems, Puzzles, Tips & Tricks  Math Forum
Links to calculation tips (Beat the Calculator, Divisibility Rules, Multiplication Tips), Math Problem sets, and math number and line puzzles.
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 K12 Multimedia Math Education  Sparkle Productions
Software and research: reports and articles are available, with print and web references and resources, in the Motivation and Learning Center, which provides suggestions for parents on increasing their child's intrinsic desire to learn. Their math materials
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 K12OPPS Mailing List Archive  Global SchoolNet Foundation (GSN)
An archive of a moderated mailing list with announcements about contests, conferences, educational WWWeb sites and other opportunities geared towards the K12 community. Browse by month, or search.
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 K12 Practitioners' Circle  National Center for Education Statistics (NCES)
New content: a site designed to make the search for NCES and selected U.S. Department of Education K12 resources fast, easy, and productive. NCES offers a wealth of information for K12 practitioners, which this site attempts to put within easy reach.
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 K12 School Supplies: Math  K12 School Supplies LLC
Teaching aids, activities, and school supplies.
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 K12 Teaching Materials (Mathematics Archives)  University of Tennessee, Knoxville (UTK)
An extensive list of Internet sites with significant collections of materials that can be used in the teaching of mathematics at the K12 level. Organized into categories: lesson plans, schools, software and other K12 Internet math sites.
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 K12th Grade Mathematics Textbook Analysis  Jim Kelly
An analysis of a number of elementary and secondary school mathematics textbook series, using 1000 commonly used conceptual, operational and notational terms, intended to help education professionals match curriculum needs to existing materials. Also
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 K3DSurf  Abderrahman Taha
Download a program for visualizing and manipulating mathematical models in three, four, five and six dimensions. K3DSurf features interactive visualization with mouse events, real time animation and morph, and mesh file generation.
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 Kagan Publishing and Professional Development
Publications and teacher training to provide children with the situations in which they behave most cooperatively. In addition to greater cooperation, Kagan's "structures" aim for greater academic achievement, improved ethnic relations, enhanced selfesteem,
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 Kakuro Puzzles  JAKRO Soft LLC
Free printable crossword puzzles that use sums instead of spellings, offered at difficulty levels of easy, medium, hard, and "evil." See also JAKRO's apps and page of tips for solving kakuro.
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 The Kaleidoscope Collector: How Kaleidoscopes Work  Hand of the Craftsman
Graphics from The Kaleidoscope Collector show the basis of and the dramatically different images produced by the three mirror, two mirror, twin mirror, and four mirror scope. Includes a brief kaleidoscope history.
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 KaleidoTile  The Geometry Center
A downloadable program for the Macintosh based on the Geometry Center's tiling program on display at the St. Paul Science Museum. You can use KaleidoTile to create and manipulate tessellations of the sphere, Euclidean plane and hyperbolic plane, and to
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 Kali  Jeff Weeks
Kali lets you draw symmetrical patterns based on any of the 17 tiling groups. It was written for a broad audience. Even the youngest children enjoy Kali. In particular, Kali does not assume the user knows how to read. For older students, Kali lets students
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 Kamanaga  Madhusudhan Nagarajan
Addition, subtraction, multiplication, and division worksheets to print out or to solve online interactively. Choose adding problems with or without "carrying," subtracting questions with or without "borrowing," and practice dividing with or without remainders.
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 KAMASUMA  KamaSuma
In this game, place the numbers so that the sums of each shape's vertices are equal. Often there is more than one correct solutionearn more points for each extra solution.
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 kanakku  Kumaresh Rajan
A JavaScriptpowered spreadsheet that performs arithmetic, trigonometric, statistical, and conversion functions. This free web application lets users cut, copy, and paste cell data; and save files to their desktops as .csv documents. Help video and tutorial
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 Kangaroo Maths  Kangaroo Maths Ltd
Free maths resources to download in number, algebra, shape and space, and data handling. Assessments include homework sheets and "make the grade" tests; games and puzzles offer World Cup spreadsheet simulations. Kangaroo Maths also hosts Microsoft Word
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 Kansas Association of Teachers of Mathematics
Bulletins, advocacy, resources, and more from the Kansas Association of Teachers of Mathematics (KATM). See, in particular, KATM's FlipBooks of of research, "unpacked" Common Core State Standards (CCSS) from many states, instructional strategies, and
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 KappAbel  Roald Buvig
Problems from a competition open to pupils in 8th grade in Sweden, Finland (including the Aaland Islands), and Denmark (including Greenland and the Faroe Islands), and ninth graders in Iceland and Norway. See, in particular, the English language weekly
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 Karismath  Shad Moarif
Learn math through visual scaffolding, whereby "... a math concept is first understood with the help of visualization, then gradually assimilated as an abstract idea in stages of decreasing visualisation and increasing numeracy." More than 10,000 worksheets
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 Ka's Geometriepage & MatheGalerie: Grundschulmathematik  Monika Schwarze
Eine Seite zur Grundschulmathematik mit SoftwareTipps. Links zu Mathematikunterrichtseinheiten für Grundschulkinder der Klassen 1 bis Klasse 4; Freiarbeitsmaterialien und kleinen Unterrichtsprojekten. A German Web site for teachers and lovers of geometry,
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 Kathy Schrock's Guide to Everything  Kathleen Schrock
A categorized list of sites for teachers on the Internet found to be useful for enhancing curriculum and professional growth. Updated daily in a wide variety of subjects, including Mathematics.
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 Keith's Think Zone  Keith Enevoldsen
Fun math miscellany about number sets, ndimensional hyperspheres and hyperballs, big numbers, areas and volumes, angles — the revolution, shortcut arithmetic, and more. See, in particular, the brain teasers "deadly disease puzzler" and "the world's
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 KenKen  Nextoy, LLC
KenKen is a sudoku variant invented by Japanese mathematics teacher Tetsuya Miyamoto. This site offers puzzles at various levels of difficulty to get you started, as well as rules, tips, news, related products, KenKen programs for your mobile device,
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 KenKen @ the Math Forum  Nextoy, LLC and the Math Forum @ Drexel
A collection of KenKen puzzles ranging in size from 3x3 to 9x9, at four difficulty levels, with many combinations of arithmetic operations. The site offers an introduction to KenKen, lesson plans, rules, discussion, and tutorial. KenKen is a number puzzle
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 Ken's Puzzle Sites  Ken Duisenberg
Links to more than 50 interesting puzzle sites Ken has found.
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 Key Aspects of Knowing and Learning the Concept of Function  Annie and John Selden; Mathematical Association of America
Marilyn Carlson and Michael Oehrtman discuss "what is involved in knowing and learning the function concept," including "the reasoning abilities involved in understanding and using functions and the dynamic conceptualizations needed for understanding
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 Key Curriculum Press
Publisher of innovative texts and software applications for teaching mathematics including the Geometer's Sketchpad (dynamic geometry), Fathom (dynamic statistics), TinkerPlots (dynamic data exploration and analysis), Michael Serra's textbook Discovering
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 KeyedIn Magazine  nelsonthornes.com
Weekly puzzles, quizzes, features of great mathematicians, fun with numbers, and strategy games. An Internet quest and "the serious stuff" offer selfscoring problems. Teacher resources provide links and ideas for each chapter of the Nelson Thornes Key
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 Key Issues for the Mathematics Community  The Math Forum
Links to Web resources addressing key issues, compiled in the following categories: Key Questions; Key Problems and Opportunities; Equity and Access (Minorities and Mathematics; Women and Mathematics; Resources for People with Disabilities; NonEnglish
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 Key Problems and Opportunities  Key Issues in Mathematics at The Math Forum
Third International Mathematics and Science Study (TIMSS); National Science Foundation in Peril; The Necessity of Setting Research Priorities.
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 Key Questions  Key Issues in Mathematics at the Math Forum
Links to Web resources addressing questions such as: Why should the public support mathematics? Why is a research mathematics program necessary for graduate science programs? Why are we wellsuited to teach mathematics to scientists and engineers? Why
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 Khan Academy  Salman Khan
Salman Khan has recorded thousands of YouTube videos on a variety of topics, largely math and finance. The Khan Academy, which Khan founded, is a notforprofit organization with the mission of providing a high quality education to anyone, anywhere. To
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 Kids and Computers  Don Sleeth
Information about MicroWorlds Logo (Windows 95) computer programming software for kids, from satisfied customer and dealer Don Sleeth. Explore how a Dad and his daughter learned this intriguing program. Welcome and Introduction, Overview, Nicole's Work,
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 KidsBank.Com  Sovereign Bank
A tutorial site in the form of an animated storybook that teaches about money, from the penny to the transfer of electronic funds. Children join characters on a tour of Money, Savings, Interest, Checking, and Electronic Banking, five chapters each hosted
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 Kids Corner  Hope Paul Productions
Games to play online, and a demo to download: Solid Geometry (make your own 3dimensional shapes), and a store where you can order math toys and games.
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 Kids Do Count! Seeking Excellence in Math Education
"We feel strongly that new new math is detrimental to our children's future...." Background, experiences of students and parents, impact, comments on NCTM, and "what to do" statements about the teaching of the "Connected Mathematics" and "Investigations
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