A mind stretching site for the upper grades http://www.figurethis.org
National Geographic for Kids http://www.nationalgeographic.com/kids/
The 24 game online. All students in grades 3-6 have been given a user name and login for this site. This is a great way to challenge computation skills. http://www.firstinmath.com
Challenging activites for your child http://www.funbrain.com
Math Playground is an action packed site for students in grades K to 6. Practice your math skills, play a logic game and have some fun! There are interactive games for logic, basic computations, and area and perimeter. http://www.mathplayground.com/
PSSA - Parents, this links you to the Pennsylvania State site http://www.pasd.com/PSSA/reading/reading/htm
Practice test items for math as well as released PSSA items from previous tests http://www.pmsd.org/pec/5th_grade_math_tutor.htm
White House for Kids http://www.whitehouse.gov/kids/whlife/index.html
Paper folding challenges http://www.teachnet.com/brainbinders/index/html