http://www.khanacademy.org (a library of over 2,400 videos covering everything from arithmetic to physics, finance, and history and 125 practice exercises)
http://www.exploratorium.edu/learning_studio/pi[interesting facts and activities centered around pi and March 14 (3/14) which is pi day]
http://www.figurethis.org/index.html [math challenges presented by the U.S. Dept. Of Education and the National Council of Teachers of Mathematics]
http://www.niehs.nih.gov/kids/ [brainteasers and riddles for all ages sponsored by the national Institute of Environmental Health Sciences]
Other links you can try:
If you have other suggestions, please email me your ideas for other links!
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