Math
http://www.pearsonrealize.com
http://www.ixl.com
http://www.sumdog.com
http://www.arcademics.com
http://www.commoncoresheets.com
http://www.khanacademy.org
http://www.multiplication.com
http://www.calculationnation.com
Science
http://www.geology.com
http://www.rocksandminerals.org
http://www.minerals.net
http://www.physics4kids.com
http://www.ducksters.com
http://www.kids.nationalgeographic.com
http://www.animalplanet.com
http://www.a-z-animals.com
Social Studies
http://www.abcya.com
http://www.yourchildlearns.com
http://www.maps101.com
https://www.kids.usa.gov
http://www.congressforkids.net
http://www.brainpop.com
http://www.scholastic.com
http://www.timeforkids.com