SCIENCE
http://www.e-learningforkids.org/science/grade/5/
https://www.education.com/activity/fifth-grade/science/
MATH
http://www.mathplayground.com/mobile/pre_brain_workout_division.html
http://www.mathplayground.com/mobile/quickcalculate_fullscreen.htm
ENGLISH
http://www.vocabulary.co.il/fifth-grade-
http://www.funbrain.com/grade