 Division For Third Graders (SMILE)  Savannah Walker, Mason School
A lesson for grade 3 that uses measurement to demonstrate division. From the Arithmetic section of a collection of almost 200 single concept lessons by the Science and Mathematics Initiative for Learning Enhancement.
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 DLK MathsWork Software
Selfdifferentiating, topicspecific math software for Windows 3.1 and above, on number, shape and space, and data handling. All of the practice modules have on screen monitoring at three levels. Six problem modules designed to improve users' application
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 Dollar Bill's Adventures with Money  BDi Software
Software for Mac or PC created to teach realworld problemsolving skills to students in grades 15. A freeware demo of the CDROM includes up to 12 activities to download, or play online using Shockwave. Activities for grades 12 focus on coin identification,
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 The DOW Bee Mental Math Project  Ronald H. Scott
"Who would like to know the day of the week they were born on?" The DayoftheWeek (DOW) Bee promotes the mental conversion of calendar dates into their weekday equivalents, requiring only a "reasonable mastery of simple division, addition, and subtraction."
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 Dragonfly Web Pages  Miami Univ. of Ohio with the NSTA
Dragonfly is an inquirydriven magazine published bimonthly during the school year, inspiring children to join with their peers and with scientists in national and international investigations. Dragonfly also publishes poetry, autobiographies, natural
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 Draining The Swimming Pool (SMILE)  William Byrne, Martin Luther King High School
A lesson that offers experiments that suggest a way to solve the general work problem: If A can do a job in X hours and B can do the same job in Y hours, how long will it take A and B working together to complete the job? From the Algebra and Trigonometry
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 Draining the Swimming Pool (SMILE)  William Byrne, Martin Luther King School
A lesson for grades 910 designed to teach students to determine the time needed to drain a quantity of water using tubes of different inside diameters; and to determine the time needed to drain a quantity of water using two tubes at the same time, contrasting
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 Drawing a Crop Circle  IES Ramon Cabanillas (Cambados, Pontevedra, Spain)
To draw a crop circle, the high school students at IES Ramon Cabanillas (Cambados, Pontevedra, Spain) calculated ellipses and discovered the pentagram's relation to the golden mean. This website details their designs, practice, calculations, and final
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 Dream Home Mathematics (SMILE)  Dennis W. Montgomery, Lyman Trumbull Academy
A lesson for grades 512, designed to teach students to use basic math to determine affordability of a home based on a given income; calculate decimal placement for currency, percentages and interest; estimate affordability based on income; investigate
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 DSP First: A Multimedia Approach  McClellan, Schafter, & Yoder
The CDROM portion of the book, containing, for each chapter: Demos  quicktime movies, sound files, etc. that help reinforce the concepts introduced in the text; Labs  MATLAB based laboratory exercises for indepth study of certain concepts and ideas
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 dy/dan  Dan Meyer
Meyer has taught high school math since 2004, and blogged about it since September, 2006, with two interests in particular: curriculum design (answering the question, "how we design the ideal learning experience for students?") and teacher education (answering
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 The Dynamical Systems and Technology Project at Boston University  Robert L. Devaney; Dept. of Mathematics
An NSFsponsored project designed to help secondary school and college teachers of mathematics bring contemporary topics in mathematics (chaos, fractals, dynamics) into the classroom, and to show them how to use technology effectively in this process.
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 Dynamic Number  KCP Technologies, Inc.
Classroomready activities of The Geometer's Sketchpad® for interacting with mathematical objects to develop deep understanding of number and early algebra concepts. Some of this content received support from the National Science Foundation (NSF)
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 Early Algebra, Early Arithmetic  TERC and Tufts University
The Early Algebra Project examines young learners as they express general relationships among numbers and quantities through written notation, tables, and diagrams. Download PDFs of class materials such as lesson plans and student worksheets; discuss
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 Early Childhood: Where Learning Begins  Mathematics  Fromboluti, Rinck; U. S. Dept. of Education
Mathematical activities for parents and their 2 to 5yearold children, in a free printable booklet by Carol Sue Fromboluti and Natalie Rinck, edited by Diane Magarity with illustrations by Barbara Leonard Gibson. For parents and caregivers, this publication
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 Early History of Mathematics  Project MATHEMATICS!, California Institute of Technology
A 30minute videotape that uses motion, color, music, and images of original documents to outline some of the important developments in the early history of mathematics, from Babylonian calendars on clay tablets produced 5000 years ago, to landmark events
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 EarthKAM  Sally Ride Science
An educational outreach program of the National Aeronautics and Space Administration (NASA), EarthKAM stands for "Earth Knowledge Acquired by Middle school students." Search the collection of images of specific locations on Earth, as photographed from
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 Earthquakes (MSTE)  John Meseke; University of Illinois at UrbanaChampaign (UIUC)
Graphing earthquake data (a dataset and sample graphs are provided) and using the information for decision making.
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 Easing the Hurry Syndrome  Jennifer Wilson
Blog by a teacher in Flowood (Mississippi) whose course load includes Advanced Placement Calculus and Geometry. Posts often begin with alignments to relevant Common Core State Standard (CCSS) and feature screenshots of TINspire CAS Navigators, with original
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 Ed's Oasis  AT&:T Learning Network
A resourcecollecting, teachingstrategysharing, communitybuilding site, including discussions via email and the Web, spotlights on various teachers for technologyintegrating ideas and projects, a "treasure zone" for students with resources in language
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 educ8r.net
A site where teachers can share what they have already developed, with formbased editing tools for creating lesson plans, tests, and lesson packages (groups of lesson plans). Browse or search math resources and other subjects.
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 Educação Matemática e Novas Tecnologias  Gravina, Barreto; Universidade Federal do Rio Grande do Sul (UFRGS)
Discusses new technologies as resources for the learning of Mathematics:
software descriptions, lesson plans, articles. In Portuguese.
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 Educational Resources Information Center (ERIC)  National Library of Education
A national information system designed to provide users with ready access to an extensive body of educationrelated literature. ERIC Sites links to clearinghouses, support components, and publishers of ERIC material. Special Projects include the Education
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 Education by Design
Publishers of educational software, focusing on special needs software for Windows and Macintosh that can be accessed with keyboard, mouse, and especially with IntelliKeys, Touch Windows or with switches. Math titles include MathPad, an arithmetic tutorial
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 education.ti.com  Texas Instruments, Inc.
Texas Instruments calculator resources and educational solutions: product information; free program downloads; classroom activities, including both a test prep section and a free, collaborative forum for sharing favorite activities that use TI technology,
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 Education World  American Fidelity Educational Services
Includes a Math Center for students, teachers, and parents, a searchable database of 110,000+ URLs, a collection of browseable regional resources, and listings of available jobs in education throughout the country and the world. Editorial content: new
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 Edwards  Clayton Edwards
Problems, lessons, units, and "starters" by a middle grades math teacher who believes in differentiation and "using a mixture of traditional and reform methods to solidify understanding and engage mathematical minds": integer operations, order of operations,
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 Effective Use of Living Space (SMILE)  William L. Brown, Parkside Community Academy
A lesson designed to teach students to measure the area of a room and various objects in this room; place scale model furniture in a room and determine the area occupied; and calculate the percentage of space used. From the Practical and Applied Math
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 Einstein's Big Idea  WGBH Boston
Resources to accompany the PBS broadcast "Einstein's Big Idea," the theory of special relativity: program transcript; teacher's guide; inquiry and articles; and "Interactives, Audio and More," which includes video of ten top physicists each describing
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 Ejercicios Resueltos de Matemáticas  Sergio De Los Santos
Ejercicios resueltos para bajar (en forma Excel): Fórmulas, Aritmética; Álgebra; Trigonometría; Geometría analítica; Cálculo, Estadística, y Física.
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 Elapsed Time (SMILE)  Bernice Joyce Henry, Edward H. White School
A lesson designed to teach students to calculate elapsed time, given beginning and ending time; and to state the time using A.M. and/or P.M. From the "Miscellaneous" section of a collection of almost 200 single concept lessons by the Science and Mathematics
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 Electronic Bookshelf (Mathematics Across the Curriculum)  Dartmouth College
Materials produced by the MATC project are listed on the Electronic Bookshelf. Topics include: Algebra; Calculus and Differential Equations; Engineering; Physical Sciences; Art; Computer Science; History and Geography; PreAlgebra; Biology, Medicine,
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 Elementary Math Enrichment  Beth Schaubroeck
Free mathematics enrichment materials for accelerated 4th and 5th graders. The 70 lessons, grouped into 12 different units, include solutions and teacher guides: Ancient Mathematics (Mayan math, in base 20; and Egyptian math, which lacks zero), Baseball
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 Elementary Math Games and Activities  Math Lessons, Belmont Education
Games, newsletters, articles, and worksheets. Games are for sale, other items free with registration. The authors also post new ideas and receive feedback on the Teaching Math Blog, where past articles and videos have included "30 Tips for teaching Elementary
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 Elementary Math Worksheet Generator  Eduvelop
A web based math generator that creates printer friendly worksheets and worksheets that can be completed online. From Eduvelop, a company that also produces courseware and testpreparation software.
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 The Elementary Preservice Teachers Mathematics Project  Suzanne Chapin, Principal Investigator
Improving preservice elementary teachers' mathematical knowledge for teaching (MKT). The Elementary Preservice (EMP) Teachers Mathematics Project has developed dozens of lessons and corresponding support materials — including video, PowerPoint
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 Elementary Thoughts: A Collection of Gail's Responses  Gail Englert
A collection of Gail Englert's responses to questions from elementary and middle school teachers, parents, and students, in the Teacher2Teacher service. Covers a wide range of elementary mathematics topics, as well as teaching points.
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 Ellipsis Math  Dr. Valerie J. Henry
A curriculum for basic math facts that "incorporates research on best practices from countries around the world as well as cognitive research on memory and retrieval." Sample algebra word "wall cards"; browse and subscribe to the Math Motivator newsletter;
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 El Niño Unveiled  Marcia Barton, Susan Freeman; Louisiana State University
What is El Niño? This threeday interdisciplinary Webquest for middle grades students combines natural history, math, and writing to introduce activities and research centered around El NiñoSouthern Oscillation (ENSO)  its history, cause,
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 El Paraíso de las Matemáticas  www.matematicas.net
Una página en castellano que pretende cubrir los múltiples aspectos de las Matemáticas, con apuntes, ejercicios, exámenes, enlaces, diccionario, etc. Orientada a la enseñanza media y superior. In Spanish: a page that
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 Emaths
Free resources for maths teachers, organized into courses such as "Investigations / Rich Tasks / Puzzles," schemes of work, grade boundaries for key stages 2 and 3 of the SATs (UK National Curriculum Tests), jokes and funnies, and more. "Very old exam
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 The EMPower Project  TERC
Extending Mathematical Power: A Math Curriculum for Adults, extends school mathematics reform to currently underserved populations so that they more effectively engage mathematical demands at work, at home as parents and caregivers, in the community,
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 Enchanted Learning  Jeananda Col, Mitchell Spector
Enchanted Learning produces children's educational material designed to maximize creativity, learning, and enjoyment. The site is usersupported with site members receiving the benefit of a version free of banner ads. In the math area of the site are
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 Encouraging Mathematical Thinking, Discourse around a Rich Problem  Math Forum: Bridging Research and Practice Group (BRAP)
This videopaper by the Math Forum's Bridging Research and Practice Group (BRAP) of teacher practitioners and Math Forum Staff opens a conversation around the use of discourse as a basis for encouraging students' mathematical thinking and supporting teachers'
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 ENGAGE Engineering  Susan Staffin Metz, Principal Investigator
Free resources to retain engineering undergraduates, particularly underrepresented groups, by improving their daytoday classroom and educational experiences. Funded by a grant from the National Science Foundation (NSF), ENGAGE provides lesson plans,
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 Enlaces en español para la matemática / Spanish language math resources  Math Forum
Mathematics and math education resources available online in Spanish, collected by the Math Forum. Categories: Juegos de ingenio/Problems and Puzzles (Brainteasers, games, and competitions); Lecciones y actividades/Lessons and activities (Lesson plans
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 Equalities And Inequalities (SMILE)  Perry Lemon, Shoop School
A lesson designed to involve students in discovery; to teach partitioning and equivalency; and to teach the order of fractions. From the Algebra and Trigonometry section of a collection of almost 200 single concept lessons by the Science and Mathematics
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 Equations with Roots 2 and 5  Jim Wilson; Dept. of Mathematics Education, Univ. of Georgia
A Pedagogical Exploration with a Relation Grapher. This paper examines sets of equations that have graphs crossing the xaxis only at 2 and 5.
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 Equivalent Fractions (SMILE)  Flora Williams, O. A. Thorp School
A lesson designed to teach students to recognize fractions of equal value and that name the same amount (number). From the Arithmetic section of a collection of almost 200 single concept lessons by the Science and Mathematics Initiative for Learning Enhancement.
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 Equivalent Fractions (SMILE)  Gertrude Lockett, Emmanuel Christian School
A lesson for grade 4 designed to teach students to visualize and comprehend the relative values of fractions by making physical representations; use fractional parts of a "whole"; and recognize relative sizes and equivalent fractions. From the Arithmetic
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