 The Menelaus Theorem  Cut the Knot!, Alexander Bogomolny
Ceva's and Menelaus' theorems compared and two proofs of the latter. An interactive column for MAA Online that uses a Java applet to simulate a puzzle or mathematical problem, one not stated directly since the applet is intended to be such that the right
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 Mentalmath  EUDACTICA
Makers of superTmatik mental math cards, and organizers of the International Mental Math Championship, which has developed number and calculation skills in children ages 615 since 2006.
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 Meredith Mathematics & Science Institutes  Meredith College
Residential professional development opportunities that focus on the "big ideas" of mathematics content for preK through high school. Learn about institute highlights, read testimonials, register, and more. MMSI and the creators of the game 24®,
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 Meridian Math Software  Meridian Creative Group, Larson Texts, Inc.
A publisher of supplemental educational math materials for students in grades K8, offering a range of comprehensive, interactive, math software programs: Larson's Excel @ Algebra; Middle School Math; Leapfrog Math (K2, 36); Larson's Sliding GeoBeads,
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 Metacognition (Learning and Mathematics)  Alan Schoenfeld; Math Forum
In his 1987 book, Cognitive science and mathematics education, Schoenfeld wrote a chapter called "What's all the fuss about metacognition?" in response to a challenge from mathematicians (among them Joe Crosswhite, Henry Pollak, Anna Henderson, and Steve
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 Meters Squared or Square Meters?  Math Forum, Ask Dr. Math Common Question
A selection of answers to questions about the difference between saying "units squared" and "square units," such as "What is the difference between 10 square miles and 10 miles square?"
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 Metric and English Unit Conversions  Science Made Simple, Inc.
Convert between different unit measurements, both English and metric: area, length, temperature, time, volume, weight, or fruit (apples to oranges).
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 Metric Conversion Blamed for Canadian Jet's Forced Landing  Jim Loy
The complete story for this headline for an AP news story, on July 29, 1983, when a measurement error in the "conversion and comunication" of metric weight and volume information caused a fuel shortage that forced a Boeing 767 to make an emergency landing.
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 Metric Conversions
Online metric conversion calculators for length, area, volume and weight along with some of the units origins and some conversion tables for printing.
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 Metric Measurements  Math Forum, Ask Dr. Math Common Question
Tables of metric measurements for length, volume, mass, and weight, with equivalences, prefixes, and abbreviations.
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 Metrics Matter  ThinkQuest Junior
A simple introduction to the metric system, starting with a basic explanation of how the metric system works. Read about the metric system in relation to other methods of measuring, and learn how to measure time, length, volume, mass, and temperature.
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 Metric System and Unit Conversion  R. H. Logan, Dept. of Chemistry, Dallas Co. Community College, North Lake College
Advantages of the metric system: it was based on a decimal system (i.e.: powers of ten) and therefore simplifies calculations; it is used by most other nations of the world, and therefore has commercial and trade advantages. If an American manufacturer
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 Metric Unit Conversion  GlobeFeed.com
Online metric unit conversion calculators for the units of weight, length, temperature, volume and area.
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 Metric Week  Math Forum, Teacher2Teacher FAQ
Answers to a frequently asked question: What are some activities I can use for Metric Week?
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 MetroMath
MetroMath "finds researchbased ways to ensure that urban children learn the mathematics they need; that urban mathematics teachers are equipped with the most effective instructional strategies; and that the human resources of urban communities are used
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 Michele's Math
Review and tips about addition, subtraction, multiplication, and place value.
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 MicroScapes  Lucent Technologies
A series of photographs taken through high power microscopes. Galleries include:
Silicon Dreams, Atoms and Ions, The Edge of Light, Solid States, Symmetry in Motion, and Memories, Glass and Apparitions.
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 Microsoft in Education  Microsoft Corporation
Organized into K12 education, higher education, academic products and pricing, and education resellers and business partners. Math, Economics, and Science Lessons for using Office in the classroom use Word, Excel, Power Point, and Internet Explorer to
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 Microtextbooks  Microtextbooks.com
Math textbooks from elementary school through firstyear college, books for developmental or remedial math programs, and adult education and distance learning programs at twoyear (U.S.) colleges, in one volume, on your computer. Living Math Textbooks
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 MicroWorlds In Action  OpenWorld Learning
MicroWorlds Logo resources: folders of themerelated MW projects of
increasing difficulty, with minilessons and extension activities. FAQ,
activity cards, vocabulary. Children or adults can learn programming in a
flexible, constructivist fashion.
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 MidLink Magazine  Caroline McCullen
"The Digital Magazine for Kids, By Kids." A bimonthly online magazine created by several middle schools and hosted by the University of Central Florida for children ages 10 to 15, linking middle schools around the world. Each magazine issue features student
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 Midwest Consortium for Mathematics and Science Education (MSC)  North Central Regional Educational Laboratory (NCREL)
A resource for mathematics and science instructional materials that provides direct technical assistance to state education agencies, intermediate state educational units, and local school districts. Activities reflect a commitment to learning based on
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 Midwest GeoGebra Journal  Michael Todd Edwards and Steve Phelps, Editors
The official publication of the GeoGebra Institute of Ohio, Midwest GeoGebra Journal publishes articles about the use of GeoGebra in teaching and learning mathematics at all levels.
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 Mighty Number
This "search engine for numbers" returns facts about figures, such as its square root, base 10 logarithm, and primality. Mighty Number also writes out quantities in several different languages (English, German, French, Spanish, and Swedish) and represents
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 Mike's Math Club  The Milken Family Foundation
A curriculum enrichment program, Mike's Math Club provides "handy hints" that promote mastery of such basics as doubledigit multiplication, and math games that show elementary school students how to use logic and deductive reasoning to create strategies
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 mikesmathpage  Mike Lawler
Blog by a former math professor "writing about math with my kids." Posts, many with videos of Lawler and his children at a whiteboard, date back to November, 2013: "Day in the life of a home school dad," "Family Math and paper folding," "Fun with James
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 Millenium Mixup?  Lesson Ideas: Math; Teachnet.Com
1999, 2000, 2001... A new century; a new millennium. But have you thought about when exactly this "next millennium"? Here's the lowdown.
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 Millennium Education Company of America  Charles Herring, Jr.
A curriculum development company that specializes in the education of children in kindergarten through 8th grade, in which music, creative arts and interactive teaching guides are used to strengthen grammar and math skills, and heighten the awareness
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 Milliken Publishing
K12 instructional books and software for home or school use, in several subject areas including math. "Math Sequences" software demo for Windows is available on the web. Software may be purchased on the web, and book dealers are listed by town within
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 MiMa  Museum for Minerals and Mathematics Oberwolfach
This German museum's exhibits about mathematics, which focus on symmetry and crystallography, have included IMAGINARY; SURFER, a realtime ray tracer of algebraic surfaces; Cinderella & Curved Spaces; jReality; Morenaments; Doppelpendel; Penrose Puzzle;
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 MindPlay
The threepart series FractionOids helps children understand, in a visual way, what happens when a denominator gets smaller or larger; discover for themselves what a common denominator is; understand why division of fractions makes numbers bigger; and
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 MIND Research Institute
Languageindependent, visually driven curricula, instructional software, textbooks, and professional development for the K12 math market. Sample MIND's JiJi penguin games or take tours of its programs, which include Integrated Instructional System™,
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 Mindstein
UK distributor of extensive range of Cuisenaire products.
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 MindTool Resource Page  Gary Lewallen
Mindtools are those computerbased technologies and programs that foster and facilitate critical thinking. A collection of online and print resources for databases, spreadsheets, programming, expert systems, and more, each categorized according to grade
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 Ministry of Education  British Columbia, Canada
Useful info for students, teachers, parents, and administrators, including Ministry programs and services, publications, and links to related sites.
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 MiniWebtool  Kevin Liu
Online math tools include an average calculator, base converter, basen calculator, binary calculator, binary converter, binary to decimal converter, binary to hex converter, binary to octal converter, bitwise calculator, compound interest calculator,
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 Minnesota Council of Teachers of Mathematics (MCTM)
An affiliate of the National Council of Teachers of Mathematics (NCTM). The site provides information about conferences, events, and programs; membership; listings of recommended math sites; MCTM highlights (Presidential Awardees, Shape of Space video,
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 Minorities & Mathematics  Key Issues in Mathematics at the Math Forum
Find sites relevant to mathematics and minorities such as African Americans, Hispanics, and Native Americans in the Math Forum's Internet Mathematics Library.
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 Mirrors (Geometry and the Imagination)  Conway, Doyle, Gilman, Thurston; The Geometry Center
How do you hold two mirrors so as to get an integral number of images of yourself? Discuss the handedness of the images. Set up two mirrors so as to make perfect kaleidoscopic patterns. How can you use them to make a snowflake?...
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 Missing Dollar  Math Forum, a Classic Problem from the Ask Dr. Math FAQ
Three men go to stay at a motel, and the man at the desk charges them $30.00 for a room. They split the cost ten dollars each... where is the missing $1.00?
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 MistaMath  Roger Vanderlely
Tutorials, advice, worksheets, and narrated screencast videos for learning the basics, fractions, and algebra: adding integers, learning multiplication tables, factor trees, exponents, definition of exponents, adding exponents, subtracting exponents,
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 Mister Goodmath's 'Cool' Challenges of the Week  Mike Rooney; Welleby Elementary School, Sunrise, Florida
More than 30 challenge problems, with hints but no solutions. Join "Gator" and pack your bag for an incredible journey through real life challenges. The first problem listed on the menu is always the most current challenge being attacked by Welleby students
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 Misunderstood Minds  PBS
The science behind learning difference, and strategies to aid success in school, are available on this companion Web site for the Misunderstood Minds PBS documentary. The site includes profiles of the students in the documentary, as well as sections on
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 MIT+K12  Massachusetts Institute of Technology
An open platform for K12 educators and Massachusetts Institute of Technology (MIT) to work together to make and crowdcurate videos about science, technology, and math. This collaboration of MIT and Khan Academy invites primary and secondary teachers
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 M.I.T. K12 Math Games Lesson Plans  Wendy Huang, MIT Teacher Ed Program Manager
A collection of math games lesson plans to make learning math fun and engaging for middle and high school students. Written by MIT teacher education students.
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 M&M Software Online Catalog
Mailorder library of familyoriented, educational and game software, a resource for schoolteachers, home school associations and parents who want to use a computer as a creative teaching tool, or just for fun. Products for Apple IIs, the Macintosh, DOS
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 Mobilizing Minds: Teaching Math and Science in the Age of Sputnik  National Museum of American History, Smithsonian Institution
The 1957 launch of Sputnik, combined with a burgeoning school age population, catalyzed reform in mathematics and science teaching in the United States. This online exhibit presents objects from the time of Sputnik, including books and apparatus associated
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 Mobius  Paul Doherty
A Mobius strip is a band of paper that's deceptively simple in its appearance and exceptionally twisted in its properties. This activity is organized into an introduction, materials required, warming up, "what's going on?" and tools for further study,
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 The Moebius Strip  Jan Garner
An exercise on making a Moebius strip (a loop of paper with a half twist in it). How to make it, what to do with it, where to find it on the Web.
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 Moms Love Math  Rymer, Meghan; and Romer, Paige
Screencasts and other videos to help parents understand Everyday Math and other math curricula.
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