Math:

https://prodigygame.com/play/

https://www.brainpop.com/games/refraction/

https://www.brainpop.com/math/numbersandoperations/multiplyinganddividingfractions/

https://www.brainpop.com/games/ratiorumble/

http://www.math-play.com/Two-Step-Equations-Game.html

http://www.math-play.com/Exponents-Jeopardy/Exponents-Jeopardy.html

http://www.math-play.com/coordinate-plane-game.html

http://www.math-play.com/square-roots-game.html

http://www.math-play.com/evaluating-algebraic-expressions-basketball-game.html

Science:

https://www.brainpop.com/games/foodchaingame/

https://www.brainpop.com/games/foodfight/

https://www.brainpop.com/games/lifepreservers/

https://www.brainpop.com/games/mattersorter/

https://www.brainpop.com/games/chronopticon/

https://www.brainpop.com/games/closeknitneighbors/

http://education.jlab.org/elementbalancing/

http://www.dynanotes.com/games/Force,Motion,andEnergySnakesandLadders.swf

http://www.dynanotes.com/games/Grade8ScienceSpintheWheel.swf

http://www.dynanotes.com/games/MatterandEnergyHangman.swf

Social Studies:

http://texaslregames.org/games_web_eng/BOR/billofrights.html

http://texaslregames.org/games_web_eng/federalists_game/federalists.html

http://texaslregames.org/games_web_eng/branches_game/branches_game.html

http://theconstitutionquiz.org/

http://teachingamericanhistory.org/static/neh/interactives/americanrevolution/

https://www.brainpop.com/games/branchesofgovernmentgame/

https://www.brainpop.com/games/branchesofpower/

https://www.brainpop.com/games/americanrevolutiontimeline/

https://www.brainpop.com/games/checksandbalances/

http://www.dynanotes.com/games/8C_ReconstructionHM.swf

http://www.dynanotes.com/games/8C_SectionalismCivilWarBAW.swf

http://www.dynanotes.com/games/8C_WestwardExpansionSL.swf

http://www.dynanotes.com/games/8C_EarlyRepublicMDQ.swf

http://www.dynanotes.com/games/8C_RevolutionarySM.swf

http://www.dynanotes.com/games/8C_ColonialEraHM.swf

http://bostonhistory.org/sub/bostonmassacre/game.html

http://www.nationalgeographic.com/features/97/west/

http://amhistory.si.edu/militaryhistory/resources/whoami/whoami.html

http://www.pbs.org/ktca/liberty/road.html

http://texaslregames.org/games_web_eng/crelay/index.html

Reading:

Readtheory.org

https://www.brainpop.com/games/quill/

https://www.ixl.com/ela/grade-8/analogies-challenge

http://www.spellingcity.com/word-match-vocabulary-game.html?listId=5624766

http://www.spellingcity.com/which-word-best-completes-the-sentence.html?listId=5624766

http://www.tv411.org/reading/understanding-what-you-read/using-context-clues/activity/1/1

http://www.readwritethink.org/files/resources/interactives/idioms/index.html

https://www.quia.com/ba/42131.html