MATH WEBSITES
http://www.sheppardsoftware.com/math.htm
https://www.khanacademy.org/math/cc-fourth-grade-math
https://www.weareteachers.com/best-math-websites/
https://www.mathplayground.com/grade_4_games.html
https://www.mathgames.com/grade4
http://www.mathgametime.com/grade/4th-grade
SCIENCE WEBSITES
http://www.sheppardsoftware.com/science.htm
http://www.e-learningforkids.org/science/grade/4/
https://www.lisd.org/technology/itswebs/elem/curr/science/4sciwebsites.htm
https://www.pobschools.org/cms/lib/ny01001456/centricity/domain/8/bestsciencesites.pdf