Mathematics
Math practice and activities http://www.aaamath.com/
Math practice tailored to state standards http://www.ixl.com/math/grades
Interactive math games http://www.coolmath.com/
Fun math games http://www.funbrain.com/
Games, homework helper, and worksheets http://www.aplusmath.com/
Interactive practice tests http://www.tea.state.tx.us/index3.aspx?id=3264&menu_id=793
Math questions and answers http://mathforum.org/dr.math/
Help resource for G4-8 math http://www.mathleague.com/help/help.htm
Reading/ Language Arts
Language arts games and more http://www.funbrain.com/
Merriam-Webster word games http://www.merriam-webster.com/game/index.htm
Spelling and vocabulary http://www.aaaspell.com/
Vocabulary activities http://www.vocabulary.com/
Vocabulary builders http://superkids.com/aweb/tools/words/
Interactive practice tests http://www.tea.state.tx.us/index3.aspx?id=3264&menu_id=793
Lexile® Framework for Reading http://www.lexile.com/
BBC “types of text” games and more http://www.bbc.co.uk/skillswise/words/reading/typesoftext/index.shtml
Varsity Tutors Free Practice Test Resource: http://www.varsitytutors.com/practice-tests and http://www.varsitytutors.com/classroom-assessment
All The Trivia: https://allthetrivia.com/
Visual English Dictionary: https://www.snappywords.com/visual-dictionary