calculate anything anywhere..

http://www.calculator.com/

Math Magic

MathMagic was a K-12 telecommunications project developed in El Paso, Texas by Alan A. Hodson. The intent of the project was to provide motivation for students to use computer technology while increasing problem-solving strategies and communications skills. MathMagic posted challenges in each of four categories (k-3, 4-6, 7-9 and 10-12) which are now archived and available to view in plain text or download in MS Word file format.

http://mathforum.org/mathmagic/

AplusMath

This web site was developed to help students improve their math skills interactively.
Visit game room and play exciting games like Matho and Hidden Picture...Test your math skills with our Flashcards! Try out the Math Word Find puzzle.
Create and print your own set of flashcards online using the Flashcard Creator! See the Worksheets section, where you can print worksheets to practice offline. Try the Homework Helper to check your homework solutions.

Math Archives

http://archives.math.utk.edu/

Math Teacher Link

Math Teacher Link is a web-based professional development program for mathematics teachers at the 9 - 14 grade levels. It provides short courses on the use of technology in teaching mathematics.

http://mtl.math.uiuc.edu/

The Geometry Center

The Geometry Center is a mathematics research and education center at the University of Minnesota. The Center has a unified mathematics computing environment supporting math and computer science research, mathematical visualization, software development, application development, video animation production, and K-16 math education.

http://www.geom.uiuc.edu/

The Beauty of Mathematics

"To those who do not know mathematics it is difficult to get across a real feeling as to the beauty, the deepest beauty, of nature ... If you want to learn about nature, to appreciate nature, it is necessary to understand the language that she speaks in"
Richard Feynman

Math World Interactive

MathWorld is an interactive, problem-solving project created by a teacher. Her goal is to encourage students to develop problem-solving abilities while improving their technology skills. By having students post their answers online, the math problems become fun for students. Users can register (free) for the "MathWorld Interactive Challenges" -- open-ended word problems. Challenges, posted every nine weeks, are grouped into levels from Kindergarten through 12th grade. Students must follow a specified format (described at the site) when working on the problems. Students from around the world can share ideas and discuss the problems. Users can also communicate for purposes other than math, such as for culture and geographic information, via the site's moderated message board. Users submit their solutions to the message board or using the online submission form. Students will receive a personalized email message from MathWorld Interactive highlighting their strengths and achievements approximately three weeks after the MathWorld Challenge cycle ends. The creator, Carol Mortensen, is available via email to help as well. This is a great way to interest students in math and to include the internet in mathematics lessons. Or teachers could use the problem-solving lessons to supplement their curricula.

http://mathforum.org/mathworld/

A Year-Long Math Adventure

Mathworld is a story I wrote about a kid who falls into a math worksheet in Mr. B's class and ends up in a fantasy world of math. I use the story as a structure for the progression our class makes throughout the year in math. In Mathworld, our class meets an evil money man, Fraction Fires, Ancient Steps of Multiplication, and a Forest of Pluses, among other friends and foes. There are 15 lands in all, each of which has a Quest which relates to one of the subjects in our second grade math curriculum. As our class moves through each land, we read the story that corresponds with that Mathworld land. Then we spend the next few weeks preparing for that land's Quest, which is a comprehensive test aligned with the 2nd grade Palo Alto standards for that math subject. As we pass each Quest, we move one step closer to "The Castle of the Third Grade." It is a fun way to mark our progress and build confidence as we study math in the second grade!

http://www.mattbowling.com/index.html

The Planet Math

MathWorld is an online encyclopedia of mathematics from Wolfram Research company based on Eric Weisstein's CRC Concise Encyclopedia of Mathematics. Unlike PlanetMath, MathWorld does not use the GNU Free Documentation License. Currently, Wolfram holds the rights to MathWorld (and hosts it on its website) and every entry is identified as being “From MathWorld-A Wolfram Web Resource.”
MathWorld was taken offline by a court injunction as a result of the CRC Press lawsuit against the Wolfram Research company and its employee (and MathWorld's author) Eric Weisstein. See the collaboration The PlanetMath FAQ for more details.
MathWorld has articles on the integers 17, 42, 163, 666 and 1729. MathWorld does not use the Mathematics Subject Classification codes to organize its entries.
In the On-Line Encyclopedia of Integer Sequences, MathWorld is one of the most often referenced mathematical web sites, with more than six thousand links as of early 2008. (Compare Wikipedia with 360 and PlanetMath with just 44).
The website is at www.mathworld.wolfram.com.