 Circular Reasoning  TJ Leone, Leone Learning Systems, Inc.
A free, Javabased software tool for thinking about circles, sectors, segments, and angles. Based on Montessori principles of learning through the manipulation of objects. Activity cards included. For Windows computers only. Includes ideas and stories
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 class.com  Class.com, Inc
Class.com provides distance education over the Internet, and offers a complete high school diploma from a fully accredited, universitybased independent study high school. Math course listings include a math skill review, basic mathematics, beginning
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 ClassZone  McDougal Littell, Publishers
In ClassZone, McDougal Littell has gathered together all of its activities, interactive online resources, research links, chapter quizzes, and other materials that support its popular middle and high school mathematics textbooks, such as Integrated Math
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 Cleave Books
Teacher Resources on Line (TRoL) include downloadable grid paper; Ttiles; dictionary exercises; shapes Bingo; MisMaths, an annotated collection of innumeracy and other math mistakes in news headlines; fact sheets; tables; formulas; a mathematical vocabulary
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 CME Project  Center for Mathematics Education, Education Development Center, Inc. (EDC)
The CME Project is a fouryear, NSFfunded, comprehensive high school mathematics program that is problembased, studentcentered, and organized around the familiar themes of Algebra 1, Geometry, Algebra 2, and Precalculus. The CME Project sets as its
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 CMP Unit Organizers  Art Mabbott
To introduce students to new units from the Connected Mathematics Project (CMP), Art Mabbott has developed a set of Unit Organizers. Adapting work done by B. Keith Lenz, of the University of Nebraska, Mabbott has also shared his MS Word documents with
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 Coastal Computer Company
An educational software company. Math titles, AlgebraMAKER and MathMAKER, drill students in basic skills, explaining the solution to each problem. Samples of these programs are available for download.
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 Coffee Hour Problem of the Week  Matthew McMullen
Classic and "found" problems, as well as original challenges, in number theory, logical reasoning, statistics, calculus, geometry, and algebra. McMullen has posted PDFs of the PoWs, as well as their solutions, since 2007.
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 Colégio de Gaia, Grupo de Matematica
Math resources in Portuguese: Galeria de Sketches  a gallery of JavaSketchpad and Geometer's Sketchpad problems and sketches including the Pythagorean theorem (o Teorema de Pitágoras), Vector Addition (Adicao de Vectores), cutting a cube/parallelepiped
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 College Preparatory Mathematics (CPM): Change From Within  Smart Catalog
Description of a high school mathematics curriculum that replaces the current, standard collegepreparatory math program with a rich problembased, integrated curriculum.
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 Color Mathematics  Erwin Gelber
High school math software for algebra, geometry, and vectors  includes a graphic calculator, an equation solver, and more. Uses a color system for improved memory.
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 Columbus State University Math Contest  David Rock and Doug Brumbaugh, College of Education, Columbus State University
Problem of the Week, Algebra in Action, Middle School Madness and Elementary Brain Teaser  all available in "challenge" mode. Past problems are archived, with solutions available upon request.
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 Common Core Math  New Jersey Center for Teaching & Learning
Freely downloadable teacherdesigned units consisting of one to two hundred Interactive White Board (IWB) presentation slides: each of grades K8, PreAlgebra (available in Spanish), Algebra I (available in Spanish) and II, Geometry, PreCalculus, AP
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 Complex Numbers  Interactive Mathematics Miscellany and Puzzles, Alexander Bogomolny
A series of articles on the algebraic structure of complex numbers and their application to solving various problems in algebra and geometry. Several of the discussed features, for example, real and complex products, are drawn from very recent literature
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 Computer Generated Islamic Star Patterns  Craig S. Kaplan
Islamic star patterns are a beautiful and highly geometric art form whose original design techniques are lost in history. This site describe one procedure for constructing them based on placing radiallysymmetric motifs in a formation dictated by a tiling
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 Coniques interactives en CabriJava (Interactive conics with CabriJava)  Yves Martin
Conics in the Euclidean and projective planes; also in algebra (group),
bilinear geometry, and arithmetic (PellFermat): 123 interactive files
using the CabriJava technology. The site is in French.
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 Connected Curriculum Project: Multivariable Calculus, Linear Algebra, and Differential Equations  Frank Wattenberg, Department of Mathematics, Montana State University
Materials (TI92, Maple, Mathematica 2, Mathematica 3, MathCad) organized around the interplay between mathematics and its applications, written together with the textbook Multivariable Calculus, Linear Algebra, and Differential Equations in a Real and
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 Connected Mathematics Project (CMP)  Michigan State University
A project funded by the NSF to develop a complete mathematics curriculum for the middle grades (68), one rich in connections among the various topic strands of the subject, between mathematics and its applications in other disciplines, between the planned
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 Connected Mathematics Project Sketchpad Activities  Nathalie Sinclair, Michigan State University
Worksheets, sketches, and teacher notes for the Connected Mathematics Project curriculum (CMP). Developed by researchers from Michigan State University and KCP Technologies, who have surveyed Years 6 and 7 of CMP. Use the link at the bottom of the page
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 ConquerMaths  Generic Maths, Ltd.
Fully online mathematics teaching system. 482 lessons with worksheets and
tests for ages 11 to 16. Money back guarantee offered. Also available from MathsOnlineTutor.com.
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 Constructing Math Instruction  Chris Robinson
Blog by teacher "averse to binary thinking that refuses to countenance all the complexities of the minefield that is the real classroom." Posts, which date back to December, 2012, have included "Number Sense and My Students"; "Analyzing Student Questions";
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 Conteúdos Digitais em Matemática para o Ensino Médio  Kaleff, Ana Maria; and Humberto José Bortolossi  Universidade Federal Fluminense
Educational Java applets and lesson plans in Portuguese. Topics include real functions, algebra, permutations, polygons, tangrams, conic sections, solids of revolution, and other two and threedimensional geometry, which includes the Englishlanguage
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 Cool Math Dudes  ThinkQuest 1996
Problems to explore, with solutions: Investment Inquiry; Circle Selections; The Beginning of Breanna; Matrices Mayhem; Breanna Returns.... With a Watch; Roots of Algebra; Breanna's Chess Companions; Squares of All Shapes and Sizes (well, not of all shapes);
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 Cool Math Guy  Dana Mosely
Watch math lessons delivered by a video instructor for several textbook publishers. Topics range from arithmetic to several variable calculus, and include review for the standardized tests such as the SAT and ACT. Also, play games that involve matching,
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 Cool Math Sites  Nina Heal
A links list in the following categories: puzzles, algebra, geometry, calculus, discrete math, statistics and probability, trigonometry and precalculus, books and reference, calculators and other technology, data, history, other links sites and internetbased
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 Cool School Tools  Tim Fahlberg
Shockwave whiteboard movies on algebra, geometry, probability, statistics, the mathematics of finance, and more. A whiteboard movie (WM) is a multimedia screen recording of writing on an electronic whiteboard (real or virtual) with or without voice and/or
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 Coop City  Peter Barricelli
A classroom project involving the construction of scale models of buildings and towns. In addition to teaching ratio and proportion, the process introduces the students to blueprint and CAD (Computer Aided Design) programs.
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 Corner for Interactive Geometry Software (CIGS)  The Math Forum
The main Math Forum page for resources devoted to the support of teaching with geometry software, especially dynamic, interactive software such as Cabri Geometry and the Geometer's Sketchpad. Instructional activities and lessons to read on the Web or
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 Countdown  Dr. Diane Schiller, School of Education at Loyola University
This site contains over 500 online math videos that cover a wide range of math topics. Many videos have accompanying printable activity sheets. The movies are organized by standard math categories on the homepage and alphabetically in the index. There's
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 Counting to Calculus: Mathematics  William K. Bradford Publishing Co.
Math software, printed supplements, workbooks, textbooks, posters, and teacher tools available for Elementary, Middle and Secondary math curriculum.
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 Count On  Department for Education and Employment, UK
Activities and resources  some simple and some fancy  for parents, teachers, and students. Resources offers, among other things, guides: to mathematical misconceptions; for parents helping with homework; for promoters of math fairs; and for providers
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 Cours de Maths de Collège Pour les Professeurs  Jean Goujon
Les chapitres d'un cours de niveau sixième; et des progressions des niveaux sixième, cinquième, quatrième, et troisième.
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 CourseServer  Jud Cornish; Fairbanks Country Day School, San Diego, CA
A Webhosted math problem generator that allows you to select from thousands of different problem types and automatically generate problemandanswer worksheets in your browser that can be printed out. Choose from a list of courses from Grade 1 (beginning
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 Covering and Packing (The Geometry Junkyard)  David Eppstein, Theory Group, ICS, UC Irvine
An extensive annotated list of links to material on covering and packing problems.
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 CPO Online  Cambridge Physics Outlet
A company founded by teachers and scientists that creates handson equipment and curriculum for teaching science, math, and technology from grades 412 and beyond, and provides effective professional development in science and math that is both content
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 Create 2D and 3D gnuplot Graphs
Input a function, vary parameters, plot 2D, 3D Surface, or 3D Contour, vary range displayed, and plot multiple functions at once. With help on various features, and links to graphing animated plots and varying the parameters. Part of the Shodor Educational
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 Creative Geometry  Cathleen V. Sanders
Teachers and students will find creative and interesting "handson" projects for most topics in the geometry curriculum. Each project is designed to help students understand, remember, and find value in the concepts of geometry. The pages are organized
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 Crop circles: Theorems in wheat fields  Ivars Peterson  Science News Online
Patterns of circles and triangles surreptitiously flattened into the crops of southern England reveal the perpetrators' sophisticated knowledge of Euclidean geometry.
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 CTAP Middle School Math Project  CTAP Region IV
A database of online technology resources supporting California middle school math content standards for grades 6, 7, and algebra. Designed for use in classroom instruction or as homework helpers for students, the matrices resources align to state standards
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 Curriculum and Evaluation Standards for School Mathematics (NCTM Standards, 1989)  National Council of Teachers of Mathematics (NCTM)
Log in to access the original 1989 NCTM Standards for grades K4, 58, and 912, one facet of the mathematics education community's response to the call for reform in the teaching and learning of mathematics, reflecting a consensus that all students need
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 Curriculum Development via Literary and Musical Forms  Joel K. Haack, Dept. of Mathematics, Univ. of Northern Iowa; the Math Forum
An article presented at the Humanistic Math session of the Joint Mathematics Meetings, January 1013, 1996, in Orlando, Florida. Haack's article discusses how the literary and musical forms can help develop a path through mathematical knowledge, envisioning
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 Curriculum IT Support (CITS)  Department for Education and Employment, UK
Materials, publications, and activities encouraging the use of information technology in secondary schools (1118 years). Information includes: a database about the use of IT in mathematics lessons in secondary schools; a booklet describing how some departments
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 Curry K. Software  Curry Kenworthy
Shareware for Education and Productivity: Pillbug Golf (Mac  learn about points, slopes, and angles while you putt); Snakey Math (Mac  the basic operations, arcade style); Galactic Geometry 3D (Windows  calculate volume and surface area of 3D objects
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 Curry's Paradox  Interactive Mathematics Miscellany and Puzzles, Alexander Bogomolny
A bewildering dissection paradox wherein recombination of 4 pieces cut of a rectangle produces a rectangle of a different size. Borders geometry and algebra. Accompanied by a Java illustration.
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 Cyberkidz  Chato BV, touchscreensoftware.nl
A free website with more than 50 games about math, literacy and geography. In English and Dutch.
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 Daina Taimina
Hyperbolic crochet, talks, publications, and other resources from the mathematician and fiber artist. See and read more about Taimina's fiber sculptures by visiting her artwork and blog. Books by this adjunct associate professor in the Department of Mathematics
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 Daniel Willingham
From the author of Why Don't Students Like School? and When Can You Trust the Experts? (subtitled: "How to tell good science from bad in education"). See, in particular, Willingham's articles, such as "Why transfer is hard," "Why students remember or
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 Database of Number Correlations  James Barton
Partitionings, prime factorizations, polygonal numbers, and other data about each of the numbers one through one thousand, as well as connections to "various material and occult phenomena." See also Barton's magic square that has interesting prime factor
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 David Royster's Home Page  Dept. of Mathematics, Univ. of North CarolinaCharlotte
Research and Scholarly Interests  Papers: Algebraic and Differential Topology; Use of Computer Algebra Systems in Mathematics Education. See also MAED 3103, a course for Secondary School mathematics teachers covering material drawn from Algebra I and
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 Davitily Math Problem Generator  Nguyen, Ly; and Pardue, David
Create worksheets and tests, including options for multiple choice, printable versions, and answer keys. Click to insert preworded questions in basic math, algebra, and geometry, the parameters of which vary randomly. Requires JavaScript. Also available
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