Here are a few of my favorite educational websites:
AdaptedMind - for reading and math- $9.95 a month/ first month free
PBS Kids - for praciticing reading/games
ABCYA - for all grade level reading
Education - choose games, worksheets, practice, for all levels of math and reading
K-5 Learning - reading and math assessments and worksheets for grades k-5.
FitBoost- sometimes you just need a little break to get up and move