Reading Advantage Practice http://www.harcourtschool.com/activity/test_tutor/build19/
Math Advantage Practice http://www.harcourtschool.com/menus/math_advantage.html
Fun Brain! http://www.funbrain.com
National Geographic for Kids http://www.nationalgeographic.com/kids/
Math Playground http://www.mathplayground.com
How Stuff Works - Science http://www.howstuffworks.com
PBS Kids http://www.pbskids.org
Brain Pop http://www.brainpop.com
Brain Bashers http://www.brainbashers.com
Funology! http://www.funology.com
Cool Math! http://www.coolmath.com
Encyclopedia Britannica Online http://www.britannica.com
Online Dictionary http://www.dictionary.com
Multipication Practice http://www.multiplication.com
Keyboarding Games for Kids! http://www.learninggamesforkids.com/keyboarding_games.html
Fraction Practice http://visualfractions.com/Games.htm
Excellent Writing & Research Site! http://www.readwritethink.org/classroom-resources/student-interactives/#top-tabs
Activities Surrounding Grimm Fairytales http://www.grimmfairytales.com/en/stories
Magnetic Poetry - Fun With Words http://www.magneticpoetry.com/kidspoetry/playonline.cfm
National Library of Virtual Manipulatives http://nlvm.usu.edu/en/nav/vlibrary.html
AAA Math - Fourth Grade Topics http://www.aaastudy.com/grade4.htm