 Learning Research and Development Center (LRDC)  University of Pittsburgh
A multidisciplinary research center whose mission is to understand and improve learning by children and adults in the organizational settings in which they live and work: schools, museums and other informal learning environments, and workplaces. Fields
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 Learning Technologies Project (LTP)  NASA Langley
The Learning Technologies Project at Langley is part of the NASA High Performance Computing and Communications K12 education program, funded as part of a NASAwide initiative whose goal is to deliver NASA research and mission content to classrooms across
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 Learning to Factor  Math Forum, Ask Dr. Math FAQ
Examples of factoring from the Dr. Math archives: trinomials; greatest common factor (GCF); least common multiple (LCM); least common denominator (LCD); dividing polynomials by monomials; quadratics; and more.
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 Learning to Learn: Problem Solving  Greg Gay, Learning Disabilities Resource Community (LDRC), University of Toronto
Find out about your learning style by solving challenging arithmetic, logic, and mathematical story problems. Puzzles include analogy exercises which reveal our abilities to infer, map meaning, classify, and alter knowledge in the face of novel learning;
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 Learning To Multiply  Math Forum, Teacher2Teacher FAQ
Answers to a frequently asked question: How do I help students learn their multiplication facts?
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 Learning to Think Mathematically: Problem Solving, Metacognition, and SenseMaking In Mathematics [PDF file]  Alan H. Schoenfeld, University of California, Berkeley
A chapter in D.A. Grouws (Ed.), Handbook of Research on Mathematics Teaching and Learning: A Project of the National Council of Teachers of Mathematics. "The goals of this chapter are (a) to outline and substantiate a broad conceptualization of what it
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 Learning Wave Communications  Human Relations Media
Learning Wave is a producer of videos, CDROMs and other supplementary materials for math education including interactive games such as Absurd Math. Under the name HRM Video it has created programs such as middle school math mysteries, applicationsbased
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 Learn Math Fast  J.K. Mergens
Sample or purchase the five volumes that explain how a homeschooling parent taught her son. The LearnMathFastBooks.com site also offers free worksheets, lessons, homeschooling articles, and other resources.
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 LEARN NC: The North Carolina Teachers' Network  Univ. of North Carolina at Chapel Hill School of Education
A collection of resources designed by experienced North Carolina educators for classroom teaching and learning and for professional development. Resources include: The Beacon, a monthly K12 education journal, and its archives; the complete North Carolina
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 Learn With Trek  NECTAR Foundation
Learn With Trek develops and markets curriculumbased mathematics software, developed by teachers, for grades K12. Each program uses engaging interactive technology to help students develop their math skills. Some products are designed as remediation
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 LearnX.com  Learning Express
Practice tests (e.g. the New York State 4th Grade Math Test) to download in PDF format; search for math or mathematics to find books to buy; browse math skillbuilding books.
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 LearnZillion
A free learning platform that combines screencast video lessons, lesson commentaries, assessments, and progress reporting. Explore lessons by Common Core State Standard (CCSS) in math.
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 Least Common Denominator  Math Forum, Ask Dr. Math Common Question
A selection of answers to questions about least common denominators, with three different ways to find them.
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 Lee's Roman Numeral Converter  Lee K. Seitz
Convert a number into Roman numerals and back again online. Site also includes a brief introduction to Roman numerals, a FAQ, and some comments on the structure of the converter program.
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 The Legacy of R. L. Moore  Educational Advancement Foundation
The Legacy of R.L. Moore Project promotes the study of inquirybased learning (IBL) and teaching methods that Moore propagated while teaching topology at The University of Texas. The "Moore Method" eschews textbooks; calls for only the briefest of lectures
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 Le Kangourou des Mathémathiques
Ce jeu de mathématiques, créé en 1991 sur le modèle du concours national australien, comporte 24 questions à choix multiple de difficulté croissante, proposées le même jour dans tous les établissements
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 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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 Length and Width  Math Forum, Ask Dr. Math Common Question
A selection of answers to questions about length and width, such as whether the length of a rectangle is always the longest side, and if there is a difference between "width" and "base."
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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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 Le site des maths à petites doses  SaintMartin Arnaud
Supplementary information and explanations of various mathematical topics, often illustrated with figures and JavaScript, as well as some sample problems and multiplechoice quizzes. In French.
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 Les jeux de Lulu, le lutin malin  Regine
Jeux, écrits en JavaScript: jeux maternelle autour du nombre, orientation, déplacement, mémoire; jeux élémentaire et plus (logique, math, orientation). JavaScript games for children.
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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 For PartWhole Meaning For Rational Numbers  Michele Gahala
Students use the Geometer's Sketchpad and work as a class to represent parts of a whole using fractional parts of a triangle, and to determine the relation among parts of a whole that are unequalsized pieces.
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 Lesson Plans  Chicago Lesson Study Group
This Lesson Plan Library organizes dozens of math lessons and units for grades 39, all aligned to the Common Core Standards. The Chicago Lesson Study Group invites teachers to rate and comment on these resources; and to join its forum to learn about,
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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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 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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 Lessons (Dan's math@home page)  Dan Bach and B & L Math Enterprises
Short descriptions of math subjects: arithmetic; prealgebra; beginning and intermediate algebra; trigonometry; functions and graphs; limits; differential, integral, and vector calculus; linear algebra; differential equations; statistics; geometry; number
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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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 Let's Do Math!  Cynthia Lanius
Maria and Cassie love doing math. The first problem they solve together is counting all the squares on a checkerboard  not just the individual squares, but all the differentsized squares that could be counted. Other Do Math problems include probability
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 Let's Graph!  Cynthia Lanius
Canga Rue Middle School conducted a survey of all its students to determine some of their interests. A graph illustrates the results of one of the questions. From the information provided, answer the following questions:  How many students are at Canga
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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 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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 Letter/Number Puzzles  Math Forum, Ask Dr. Math Common Question
A selection of answers to questions about cryptograms, alphametrics, letter sequences, and other letter/number puzzles, such as SEND + MORE = MONEY.
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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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 Levitated  Jared Tarbell
"Visual poetry and science fun narrated in an object oriented graphic environment." See, in particular, the generators in sketches and applications; and "open source," a library of fractals, cellular automata, spacefilling algorithms, "autofixing words,"
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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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 The Lial/Hornsby Algebra Series Web Site  Addison Wesley Longman, Inc.
A site supporting the Lial/Hornsby Algebra series with additional practice, quizzes, tutorials, exercises, and information about the textbook supplements. For every chapter of each textbook, the site provides a glossary; InterAct plugin tutorial exercises;
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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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 Libuninum  Bill Poser
This is a library for conversion between integers and Unicode strings representing integers in the great majority of numeral systems. It allows programs to accept input and produce output using numerals of many types (e.g. Chinese, Roman, Tibetan, Old
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 License Codes  Ivars Peterson (MathTrek)
Some states use complicated schemes for establishing driver's license identification numbers. The numbers may include check digits to detect errors or fraud, or they may encode such personal data as the month and date of birth, year of birth, and sex.
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