Fun brain has fun activities for children.

A plus math is a site the children can use to explore math activities.

Search for "Main Idea", pick the first reading rocket skills games.  When 
finished, go back and choose the next reading rocket skills game.

A variety of educational materials can be found here.  Many things may be 
printed for free.  A parent found this and said it was helpful practicing 
time skills.

Offers information handpicked by editorial staff and geared toward kids 7-
14.  Only G-rated pages are on this site.

A search engine for kids 7to 12

This site lists more than 6,400 librarian picked sites.  It provides reading 
levels on the results page.