 Corbettmaths  John Corbett
Hundreds of videos, "5aday" and other worksheets, practice papers, practice questions, revision cards, conundrums, quizzes, and more by a Somerset (U.K.) mathematics teacher.
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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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 Crazy Math Teacher Lady  Lisa Bejarano
A high school math teacher in Colorado, Bejarano began blogging after "an awesome 3 day experience at NCTM Denver." Original classroom materials by herself and her students regularly enrich her posts, which date back to that April, 2013 annual meeting
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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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 The Curious Creative: Maths  Tom Barrett
Blog by a former teacher and ICT Subject Leader. Barrett's math posts, which date to back to July, 2006, have included "Addressing the Balance: Multiflyer Times Tables Challenge," "Using Nintendo Wii Sports for Addition and Subtraction," "My Maths Lesson
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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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 Daily Dose of Teaching Awesome  John Mahlstedt
Blog by a math teacher in the Bay Area who also coaches track and basketball at his middle school. Posts on his "journey to find and document at least ONE good thing everyday of the school year" date back to January, 2014: "Desmos Brings the Noise," "Central
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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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 Demos with Positive Impact  David R. Hill and Lila F. Roberts
A collection of classroom demonstrations that use some form of instructional technology. The authors invite others to submit demos and provide them with feedback on the demos already collected. Demos are organized under the levels of Pre Calculus, Calculus
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 Desafios Matemáticos  Paulo Ferro
Cinco desafios novos cada mês. Ferro, um professor de matemática licenciado pela Universidade de Coimbra, tambem oferece demonstracões de geometria dinâmica, jogos matemáticos, biografias de matemáticos, exames
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 Descriptive Geometry  Petr Plavjaník
Software for creating and printing drawings, including conic sections, color fillings in Monge's projection, and axonometry. In English and Czech.
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 The Diamond Theorem  Steven H. Cullinane
Finite projective geometry explains the surprising symmetry properties of some simple graphic designs  found, for instance, in quilts. Links are provided for applications to sporadic simple groups (via the "Miracle Octad Generator" of R. T. Curtis),
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 Digital Mathematical Performance  Gadanidis, George; Borba, Marcelo; Hughes, Janette; et al.
Watch video, liveacted dramatic storyboards, and animations of how people "perform" mathematics: Flatland, "Help Me, Fermi," Should Parallel Lines Never Meet," "The Pleasure of Making 10" (linear equations), "The Waiter" (the missing dollar problem),
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 Digital Math  Santa Barbara County Education Office
A site to assist Algebra I, Grade 7, and Grade 6 students, their parents, and educators with the California State Mathematics Content Standards. Log in for Quicktime that provides stepbystep instruction to solve problems aligned with the mathematics
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 Discovering Geometry Newsletter  Key Curriculum Press
A free biannual publication providing information and teaching techniques for The Geometer's Sketchpad software package, the Discovering Geometry Newsletter is a resource for those interested in geometry and technology education. Download PDFs of past
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 Discovering the Art of Mathematic  Fleron, Julian, et al.
Resources to help mathematics faculty teach the subject to liberal arts and humanities undergraduates by actively involving them in authentic mathematical experiences that "provide meaningful cognitive and metacognitive gains, and nurture healthy and
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 Disfruta Las Matemáticas  Rod Pierce, mathsisfun.com
Spanish language version of Maths is Fun.
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 Divisible by 3  Andrew Stadel
Stadel has taught prealgebra, algebra, and geometry in middle school since 2004. His blog about "interactions with math, logic, life, teaching, and the web they spin together" dates back to March, 2012, with posts such as "Survey your students"; "2012
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 Division by Zero  Dave Richeson
A blog about "math, puzzles, teaching, and academic technology." Posts, which date back to September of 2008 and sometimes introduce original applets, have included "Volumes of ndimensional balls," "Albrecht Dürer's ruler and compass constructions,"
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 donalduncan's Channel
Narrated paper and pencil instructional videos  some, specific to British Columbia's Foundations of Math and Precalculus exams  on number, line segments and lines, rational expressions, factoring, quadratic functions, functions, exponents, polynomials,
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 Downloadable Articles, Papers & Materials  Michael de Villiers; Mathematics Education, Univ. of DurbanWestville, South Africa
Articles by Villiers related to geometry and geometry education some in PDF format, including: An Extended Classification of Quadrilaterals; A Mathematical Treasure Hunt; Place Kicking Locus in Rugby; Sketchpad Solutions and Results; A Dual, and Generalizations,
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 Downloads  Mac  Mathematics  CNET Download.com
Search this site to find a particular piece of software for the Mac, or browse their mathematics listings.
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 Downloads  PC  Mathematics  CNET Download.com
Search this site to find a particular piece of software for the PC, or browse their mathematics listings.
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 Do Your Home Work Arizona  Stand for Children Arizona
A free tool for Arizonan parents to better understand the homework assigned to their children. Use the pulldown menus to select math and a grade K8, or search with a keyword, for outlines of math content standards, homework help resources, and access
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 DPGraph (Dynamic Photorealistic Graphing)  David Parker
Software that allows you to: display multiple simultaneous dynamic photorealistic 3D implicit equalities and inequalities, and intersections of their volumes; spin, slice, and view timedependent (moving) photorealistic surfaces in real time; and construct
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 Dr. Alfred Posamentier  Education Update, Inc.
Blog by the Dean of Education at Mercy College (New York). Posamentier's Posts, which date back to August, 2010, have included "A Power Loop," "The Unusual Number Nine," "The Irrepressible Number 1," "Enriching Mathematics Instruction, Rather than Teaching
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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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 Drawing on Math  Tina Cardone
Blog by a public high school math teacher in Massachusetts who has participated in Boston University's PROMYS and the Institute of Advanced Studies' PCMI. Posts, which date back to August, 2011, have included "End of Year Reflections: Geometry Favorite
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 Dr. Genius  Hilaire Fernandes
Dr. Genius: "Geometry Exploration and Numeric Intuitive User System." The successor of the Dr. Geo Project, this GNU interactive geometry software allows the construction and manipulation of geometric figures. Read documentation, subscribe to the mailing
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 Dr. Math Books  the Math Forum @ Drexel
Featuring Internet references, glossaries, indexes, illustrations, and questions written by actual kids, each can be purchased from Amazon.com via links on this page. The page details the contents of each book: Dr. Math Gets You Ready for Algebra, Dr.
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 Duke University Math Union  Jadrian Miles
The Duke University Math Union (DUMU) writes and hosts the annual Duke Math Meet. Download PDFs of problems and solutions from meets dating back to 1998.
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 Dynamic Mathematics Visualization for Young Learners
Sketchpad in Grades 38  a working conference, held at the University of Illinois at Chicago in February, 2003. Researchers, curriculum developers, and educators began developing a curriculum and software structure around The Geometer's Sketchpad technology
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