http://www.danicamckellar.com/

http://www.mathdoesntsuck.com/book/

Math Songs: http://www.mscc.cc.tn.us/webs/vyoung/songs/Main_Pages/Tables.htm

Transformations: http://jennifer.jasensky.com/

Only Math: http://www.onlymath.com/

Carnegie learning: http://www.carnegielearning.com/ 
(Although it is a vendor site, it does have some research on it.)

Math Pro press: http://www.mathpropress.com/index.html

This is a nice applet for doing percentages. It will calculate either the whole amount, the partial amount, or the percentage if given two of the three. http://matti.usu.edu/nlvm/nav/frames_asid_160_g_3_t_1.html

An applet showing the relationship between the sides of a right triangle. http://www.ies.co.jp/math/products/geo2/applets/pythasvn/pythasvn.html

Bill's math links: http://bg043.k12.sd.us/classes.htm

A collection of simple, yet really neat geometric designs and activities
http://www.cyffredin.co.uk/

A tutor site that has free registration
http://www.fasthomeworkhelp.com

Submitted by Cindy Kroon

Square root video from worldbookonline: http://www.worldbookonline.com/wbdiscover/media?id=vd000683

Plotting the graph of a linear equation: http://www.worldbookonline.com/wbdiscover/media?id=vd000648

Pascal’s triangle http://www.worldbookonline.com/advanced/extmedia?id=ar348960&st=Mathematics&em=pc330929

Pi Dye is a great resource for Pi Day! This is where I ordered the fabulous pi cookie cutter. There are also many other pi products, all priced in multiples of pi.

The TeachEngineering digital library provides teacher-tested, standards-based engineering content for K-12 teachers engineering content for K12 teachers to use in science and math classrooms. Engineering lessons connect real-world experiences with curricular content already taught in K-12 classrooms. Mapped to educational content standards, TeachEngineering's comprehensive curricula are hands-on, inexpensive, and relevant to children's daily lives.   http://www.teachengineering.com/

Sports Club Math is a gold mine for math teachers looking for a sports angle. There is data for MLB, NFL, NBA, NHL, NCAA BB, Soccer, and Auto racing. http://www.sportsclubstats.com/ .

 Convert the first 10,000 digits of pi into a musical sequence. Select ten notes and the notes corresponding to each digit of pi will play.

National Library of Virtual Manipulatives from Utah State University sorts interactive applets by grade level and strand
http://nlvm.usu.edu/en/nav/vlibrary.html

Kennesaw State University interactive math manipulatives
http://science.kennesaw.edu/~plaval/tools/index.html
My personal favorite is http://science.kennesaw.edu/~plaval/tools/quad.html which allows the user to investigate the effect of changing constants in quadratic graphs

Larry Green's Homepage of virtual math manipulatives provides interactive applets for students to explore mathematics.
http://www.ltcconline.net/greenl/java/

Math Cartoon Archives by Carolina Biological

Math Work is an on-line math worksheet generator. (Free!) This web site will allow you to create printable math worksheets from your browser. (Elementary and Middle School level math)
http://www.scottbryce.com/mathwork/

Math animations: http://ck022.k12.sd.us/miscpages/mathanimations.htm

Calculus-help.com includes songs, animations, and many interesting mathematical distractions. Don't miss this guy's version of the quadratic equation song!

Cindy's math links: http://ck022.k12.sd.us/links/coollinks.htm

The MegaPenny Project aims to help by taking one small everyday item, the U.S. penny, and building on that to answer the question: "What would a billion (or a trillion) pennies look like?"

The Aunty Math website presents math challenges for K-5 learners.

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