Math
Grades K-6
http://www.mathplayground.com/common_core_state_standards_for_mathematics.html
Grades K-8
http://www.mathgames.com/standards/
Grades K-12
https://www.khanacademy.org/
Other Math Suggestions
https://www.commonsense.org/education/blog/best-math-apps-and-websites-aligned-to-common-core-standards
K-12 Math/LA Common Core Aligned
http://powermylearning.org
ELA
Grades K-5
https://www.raz-kids.com/
Grades 6-8
https://sites.google.com/site/gameonlearning/la-middle-school-games
Grades 9-12
https://sites.google.com/site/gameonlearning/la-high-school-games