Social Studies - Harcourt Reflections: California - activities, games, atlas, primary resources http://www.harcourtschool.com/hss/
National Geographic for Kids http://www.nationalgeographic.com/kids/
Fun activities - by girls....for girls. http://www.missoandfriends.com/
Math support - Houghton Mifflin is an educational publisher of text books, instructional technology, assessments and other educational materials for teachers and students http://eduplace.com/math/mthexp/
This is the site for review and fun games Science Review and Games