Math Websites:
http://www.ixl.com/math/grade-3
https://www.xtramath.org/

Use the website below to help create your Mr. or Mrs. Gallon:
http://www.angelo.edu/faculty/jbarnard/bulletin_board/Measurement/gallon-man.pdf
http://www.mathplayground.com/games.html
http://honorpoint.com/
http://www.arcademicskillbuilders.com/
http://www.thatquiz.org/tq-c/math/place-value/
http://www.softschools.com/grades/3rd_grade/math/