 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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 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, and 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 over 1400 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 keep
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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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 Kids First  Coalition for Quality Children's Media (CQCM)
The Coalition for Quality Children's Media evaluates children's media, and is a resource center and clearinghouse for children's media that helps parents and kids find good adultapproved and kidtested programming. A searchable video and CDROM database
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 Kids Math
Elementary and intermediate drill exercises/games (timed, with answers shown correct or incorrect) for learning addition, subtraction, multiplication, division, fractions, decimals, measurement, graphs. In English, Spanish, and Chinese. Also prealgebra
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 Kidsmath  About.com
A guided portal to the world of kids' internet math sites. Includes links to math sites categorized by level and topic; math newsletters (which typically highlight a group of sites on one topic, with associated articles); discussion forums; monthly problems
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 KidsNook
A search engine for children. Search for words like math, multiplication algebra, etc. to find games, songs, and sites for learning math.
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 Kids' Place Brain Teasers  Houghton Mifflin Company
Math puzzles for grades 34, 56, and 7+. You don't need to be a math whiz to solve them, just to be patient and find different ways of looking at things. New puzzles and the answer to the previous week's puzzles are posted each Thursday. Helpful hints
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 KIDS Report Archive (Internet Scout Project)  Computer Sciences Department, University of WisconsinMadison
Kids Identifying and Discovering Sites  reports written by and for kids about cool and helpful Web sites, on various topics (such as Cool Connections, Stretching the Mind, Native Americans, Ancient Civilizations, Election '96, The Planets, etc.). Includes
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 Kids' Tech University  Virginia Tech
Kids' Tech University (KTU) sparks kids' interest in science, technology, engineering, and mathematics (STEM) through a handson activity, virtual lab, and interactive session, held once a month from January to April, in a lecture hall on the campus of
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 Kids Web: Math Fun, Science Fun  Chicago Systemic Initiative (CSI)
A small collection of fun and educational links to sites for kids. Each link is described briefly.
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 KIDware Educational Software  Lou Tylee, KIDware
Educational math software for Windows. Elementary programs, programming tutorials, and realworld math tutorials for higher grade levels. Commercial site, with some free programs.
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 KidWind Project  KidWind Project
The KidWind Project is a team of teachers, engineers, and scientists committed to innovative energy education, focused on wind power. The project aims to make affordable project kits available, and provides free lessons and teaching ideas, which could
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 Kinds of Constructivism: An Annotated Bibliography  Annie & John Selden; The Math Forum
A bibliography prepared by Annie and John Selden as a supplement to "Constructivism in Mathematics Education  What Does It Mean?"  a talk they gave at the 1996 Joint Mathematics Meetings in Orlando, Florida.
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 Kinetic Books
A line of interactive textbooks that take advantage of computers by including simulations, animations, audio, video, multiple selfassessment tools for students, scoring, and much more. Digital Algebra I textbook offers online demo, trial version, or
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 King of Mnemonics  Anton Prasolov
Prasolov's Hermes tables, alongside poems such as "fact dense fogs warm suns defy," help you remember mnemonics for determining large cubic roots, weekdays from dates, and more. Demo or purchase his King of Mnemonics (KoM) Windows software. Inspired by
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 Kirigami  Kevin S. Whitley
Kirigami is the Japanese art of making figures out of paper by cutting. This applet lets you create similar figures on your computer by cutting a polygonal wedge from a virtual piece of folded paper. You can change the regular polygon, your wedge, and
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 Kitchen Conversions  Gourmet Sleuth.com
Calculators for and information about common cooking conversions. Includes a calculator with actual weights for over 6500 foodstuffs, as well as one with rough estimates for converting between grams (weight) and teaspoons and other common cooking measures
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 KitchenMath.com  MotionNET.com
Submit fraction or decimal amounts for conversion into pinches, dashes, teaspoons, tablespoons, fluid ounces, cups, pints, quarts, and liters. Scale quantities using the "multiply values by" field.
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 Kitchen Table Math  Catherine Johnson
A collaborative weblog that began when Johnson's son "... finished out the school year with a 39 on his Unit 6 test, Fractions and Decimals.... Later on I discovered that fractions are the 'bottleneck' in elementary mathematics; lives are lost in the
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 K'NEX Education Division  K'NEX Industries, Inc.
Manipulatives consisting of rodandconnector construction toys. K'NEX Education offers Sets of packets (samples downloadable in PDF format) suggesting uses for math and science in the classroom through building models. Classroom K'NEXions provides lesson
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 The Knight's Tour  Dan Thomasson
The Knight's Tour web site shows various ways to solve open and closed knight tours. The site also offers several animated tours, artwork, and new concepts (magic squares, tessellations, and conjectures about prime numbers) derived from knight moves on
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 Knot a Braid of Links (CAMEL)  Canadian Mathematical Electronic Information Services
Mathematics on the Web: a collection of mathematical Links of the Week from 1996 on, with a new one every week. Maintained by CAMEL at Simon Fraser University.
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 Knot Magic Not Magic
(MatheMUSEments!)  Ivars Peterson (Math Muse for Kids)
Sometimes what looks like an impressive knot isn't a knot at all. Magicians and escape artists are experts at tying phony knots. Though magicians like knots that can fool people, mathematicians are mostly interested in real knots, especially knots that
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 Knots (Geometry and the Imagination)  Conway, Doyle, Gilman, Thurston; The Geometry Center
A mathematical knot is a knotted loop (a knot that can be unknotted is called an unknot). Two knots are considered equivalent if it is possible to rearrange one to the form of the other, without cutting the loop and without allowing it to pass through
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 Knots on the Web  Peter Suber, Earlham College
A comprehensive list of knot resources on the Web c2004, annotated and organized into three categories: knot tying, knot theory, and knot art. Also Knot books and a Knots Gallery displaying images from the newsgroup rec.crafts.knots.
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 Knotted Walks  Ivars Peterson (MathTrek)
Given that it normally takes some effort to create a knot, the spontaneous formation of knots in ropes and strings can appear rather puzzling. Having no obvious explanation of the effect, frustrated users can't help but acknowledge this knotting phenomenon
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 Knot Theory  ThinkQuest 1997
A short course on knot theory, including tutorials on the basics, knot invariants, knot properties, and knot arithmetic; biographical information on historical and contemporary figures working with knot theory; applications of knot theory; a discussion
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