FunBrain Educational games http://www.funbrain.com/
Kids Click! http://sunsite.berkeley.edu/KidsClick!/
Yahooligans Online Search Engine http://www.yahooligans.com/
Houghton Mifflin Reading Site http://www.eduplace.com
When you open this link, click on the 3rd grade tab. Then, test your skill on a variety of math topics covered in 3rd grade. AAAMath