 Lemonade Stand  Jason C. Mayans
A Web version of the computer game Lemonade Stand: you have to decide how many cups of lemonade to make based on the weather forecast. You also have the option to advertise and attract more customers. You receive a daily report with financial information
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 Leone Learning Systems  TJ Leone, Leone Learning Systems, Inc.
Online courses for kids anywhere, and local teaching and tutoring services for students in Chicago and the Northern Suburbs of Chicagoland. LLS provides a free geometry software package for children age six and up, and free resources for teachers and
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 Les quatres opérations sur les nombres entiers  Gilles G. Jobin, Projet Diderot
An interactive course, with extensive use of the Geometer's Sketchpad. Sommaire: Introduction générale; Conseils techniques; Une définition des nombres entiers; L'addition; La soustraction; La multiplication; La division; La priorité
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 Lesson Lab Research Institute
The independent research arm of Achievement Solutions at Pearson, with a mission of improving teaching and learning in K12 classrooms. Government agencies, foundations, and internal funding support their research efforts. LLRI has become a hub for a
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 Lessonopoly  Silicon Valley Education Foundation
A free tool that lets teachers manage their classrooms, find and share lesson plans, and connect with other teachers.
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 Lesson Planet: Math  Cathy Neushul; Education Planet
Lesson Planet is a search engine for teachers that provides teacherreviewed online resources including more than 26,000 math lesson plans, 10,000 worksheets, and 200 sites. Try the site free for ten days, or sign up for a site license as an individual
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 Lesson Plan Search  Google
Free math lesson plans that make use of Google Earth, Google Calendar, Exploring Computational Thinking, and other products and projects of the search engine company: Telling time & Google Calendar; Human Dimensions Project; Median of Latitude Data;
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 Lesson Plans  edHelper.com
A searchable, annotated database of over 5,500 lesson plans from other sites, in a variety of subjects. Math lesson plans include addition, algebra, applied math, calculus, discrete math, probability, statistics, and more.
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 The Lesson Plan Shop  Matt Campbell
Share or sell lesson plans, searchable by math subject areas, grades, duration in minutes, price, and keyword.
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 The Lesson Plans Page  Kyle Yamnitz, Univ. of Missouri
A searchable archive of over 300 lesson plans in math, science, social studies, music, art, language arts, etc., written by Yamnitz and other members of the University of Missouri. Lesson plans are separated by subject and grade level, and users can add
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 Lessons and Curriculum  MSTE, University of Illinois at UrbanaChampaign (UIUC)
Browse lessons predominantly for middle and high school students, from the Office for Mathematics, Science, and Technology Education (MSTE) and from other sources.
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 LessonSnips  LessonSnips
Free lesson plans, worksheets, and activities.
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 Lesson Study in Japan  U.S. Science Education  Education Department, Mills College
Research into Japanese "lesson study," a process in which teachers cooperatively develop and critique new lessons. The site focuses on possible applications and challenges of lesson study to U.S. science and math education. Read related articles and
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 Lessons, Tutorials, and Lecture Notes (Mathematics Archives)  University of Tennessee, Knoxville (UTK)
An extensive, alphabetical, annotated listing of sites providing course material for teachers and students of mathematics. Includes topics from almost every field of math, at every level: K12, college and beyond. Algebra; Analysis; Arithmetic; Calculus;
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 Letopweb.org
Des jeux éducatifs pour mathématiques au primaire: connait les chiffres de 0 à 9; pratique le carré des tables de multiplication; retrouve la figure qui correspond à celle de gauche; fait des exercices de calculs; apprend
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 Let's Have a Field Day! (ITDC Webquest)  Noelle Kreider, Rialto Unified School District
A lesson plan in which sixth grade students are asked to plan a field day for their class. Some of the integrated skills include using an almanac to assist in decision making, using and interpreting weather sources, and reading and drawing maps, and basic
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 Let's Play Math!  Denise Gaskins
"As a homeschool mom who loves math, I want to help other homeschoolers see the variety and richness of the subject.... I hope this blog will be a place where we can play around with ideas about learning, teaching, and understanding math. (For me, it
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 Let's Read Math  Claire Passantino
A national math literacy program that aims to "spread a joy for mathematics among children and the adults who care for them — at school, at home or in various outofschool settings." Let's Read Math (LRM) offers parentchild workshops that promote
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 Let's Take a Trip  G. Carney
Students use the Internet to find the distance from their home city to another city; decide how many miles they could travel in one day; find places of interest to visit along the way to their final destination; and describe in a daily journal the places
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 Letters from John Dewey/Letters from Huck Finn  Barry Garelick
Using the name John Dewey, Garelick wrote a set of letters that chronicles his journey through ed school as he pursues a second career as math teacher after retirement. A few years later, he wrote a second set of letters using the name Huck Finn, this
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 Letters to a Young Math Teacher  Rising, Gerald; and Patenaude, Ray
Softcover and Kindle book to "assist the neophyte teacher as he or she enters the real world of the school" based on the experiences of Rising, a former National Council of Teachers of Mathematics (NCTM) board member who has taught and served as department
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 Lexique de mathématique  Paul Patenaude
Lexique alphabétique pour l'enseignement primaire et secondaire, abaque  zéro. In French.
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 Liars and Truthtellers  Math Forum, a Classic Problem from the Ask Dr. Math FAQ
A princess visits an island inhabited by two tribes. Members of one tribe always tell the truth, and members of the other tribe always lie. What question should the princess ask the natives to find out the right road to take?
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 Library of Congress
A Global Electronic Library linking to WWW meta indexes and search tools, federal government information, and other WWW resources by subject. Search using a keyword (such as mathematics) to find relevant pages, then use your browser's 'find' function
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 Library Video Company
Library Video Company offers a searchable, browseable catalog of video and CDROM products for mathematics instruction on the K12 level, from addition to variables. This resource for primary and high school math educators looking for curriculum enhancers
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 Lightning Reflex  Jason Lowe
Online math competitioncompete with people from all over the world. Every month features a different
area, such as timestables or addition. Requires Flash 6 or higher.
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 Lightspan  The Lightspan Partnership Inc.
The education portal and Internet presence of The Lightspan Partnership, whose primary concern is the use of technology in teaching, offering Lightspan PageOne, which allows teachers to use forms and templates to create a class resource page on the Web.
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 Limited English Proficiency Students and Mathematics  Kristen Lockwood; Math Forum
An annotated bibliography of resources for mathematics teachers and others interested in how language may affect the thought, achievement and assessment of students of limited English proficiency, as well as these students' access to knowledge and education.
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 Links to Information on Number Systems  Suzanne Alejandre
Arabic, Babylonian, Chinese, Egyptian, Greek, Mayan, and Roman number systems, two to ten links in each category.
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 Literature and Mathematics  Math Forum, Teacher2Teacher FAQ
Answers to a frequently asked question: How can I teach mathematics using literature?
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 Literature for Science and Mathematics: Kindergarten Through Grade Twelve  California Department of Education
A collection of over one thousand science and mathematicsrelated picture books, easy readers, classics, and other works of literature for children and adolescents. The recommended titles reflect the quality and the complexity of the types of materials
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 A Little Math about the Golden Mean  Rashomon (K. Wiedman)
The Fibonacci Series and the Golden Mean are intimately connected. The Fibonacci Series is a series of numbers in which each number is the sum of the two previous numbers... The ratio of each term to the previous term in the Fibonacci Series is equal
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 The Little Math Puzzle/Le Petit Problème  Royal West Academy and Canada's SchoolNet
Weekly puzzles posted to Canada's SchoolNet Listserv, intended to be an Internet icebreaker activity for a wide range of classrooms. Inspired by The Great Canadian Trivia Contest, these puzzles are designed for students in grades 5 through 10 and usually
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 LiveCube.com  Min Shih
A puzzlebuilding system: small colored cubes may be joined to create larger assemblies. Site includes puzzle models, discussion areas for puzzle designers and educators, and a catalog of puzzle components for purchase. Requires several plugins; files
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 LiveSudoku  LiveSudoku.com
Play Sudoku free online at four different levels: beginners, medium, hard, and "wicked." The JavaScript game's options include pencil markings, highlighting, and solution checking. LiveSudoku.com also offers tutorials, tracks player performances on current
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 Living Math!  Julie Brennan
A site dedicated to sharing resources for learning, exploring and enjoying math in a dynamic and holistic manner. The homeschooling author has "... found that math history and literature humanizes math, makes it come alive, and provides the context needed
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 Living Maths HQ  Living Maths
Begun in 1995, this math olympiad has grown from a syllabus for one bright young student into a weekly challenge for thousands of South African learners.
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 L'île des mathématiques
Cours de mathématiques, tous niveaux: fiches à télécharger.
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 l'île des mathématiques  Tom Pascal
"L'île des mathématiques propose des cours et des exercices de maths et de
physique.
Il est possible de télécharger les nombreuses fiches.
Aussi bien pour les élèves que pour les professeurs de collège et de lycée.
Des forums gratuits d'entraide sont
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 Locating, Using, and Integrating InternetBased Mathematics Materials (NCREL)  Gilbert Valdez; Pathways to School Improvement
Goals, options for action, criticism, and implementation pitfalls; informative video and sound clips; organizations, agencies, and websites that work toward providing schools with better Internet and mathematics materials access. From the North Central
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 Lockhart's Lament  Keith Devlin (Devlin's Angle)
Keith Devlin writes in his March, 2008, column: "This month's column is devoted to an article called A Mathematician's Lament, written by Paul Lockhart in 2002. Paul is a mathematics teacher at Saint Ann's School in Brooklyn, New York. His article has
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 Lockheed Martin/UCF Academy for Mathematics and Science  University of Central Florida
A Master's Degree Program for K8 teachers dedicated to improving mathematics & science education throughout Central Florida. Site has links to a Mission Statement; Academy Description; Program of Study; Faculty and Staff; Advisory Committee Members;
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 Logical Art and the Art of Logic  Guenter AlbrechtBuehler
About pentominoes, the patterns they create, and what pentominoes have to do with Escher, Penrose, Logic, Impossible Objects, Mathematics, and Art. Download a DOS program, 'newpent.exe', that assembles (6x10) pentomino solutions manually or automatically
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 Logical Art and the Art of Logic  Guenter AlbrechtBuehler
An illustrated essay about pentominoes, flat shapes formed from five (Gr.pente = five) unit squares. Also a DOS program for pentomino solutions (6x10) and galleries of pentomino creations.
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 The Logic Puzzle Museum
Play with more than fifty different handson brain twisters, mechanical and logic puzzles  and craft your own. Regular events at this Burlington, Wisconsin, museum include Valentine's Day (makeyourown historic rebus valentines), celebrations of the
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 Logicville
Anagram, chess, cryptarithm, cryptogram, doublet, logic, mathematical, magic word square, and tangram puzzles. Select a puzzle at random; solve the puzzle of the week. Interactive puzzles require Java.
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 The Logic Zone
A collection of logic problems with answers, logic puzzles, and cryptograms.
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 The Logo Foundation
A nonprofit educational organization devoted to informing people about Logo and supporting them in their use of Logobased software and learning environments. The site includes links for workshops and seminars; books and videos; Logo software (at discount
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 Logotron Educational Software
A U.K.based division of Addison Wesley Longman, Logotron publishes educational software for schools in numerous subjects, including mathematics, datahandling, multimedia, internet, earlylearning, and crosscurriculum. All are tied to key stages where
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 Lois Terms's Home Page  Rebecca S. Lindsay
"Lois lives in a condo with her mixedbreed dog, G.C.F., and a goldfish named L.C.M. She dedicates her time and efforts to the task of making the world of math understandable and exciting to middle grade students..." Lois Terms answers emailed math
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