http://www.fun4thebrain.com
http://www.mathmagician.com
www.aaamath.com
http://www.primarygames.com
http://www.internet4classrooms.com/skills-3rd-mathbuilders.htm
http://www.elcerritowire.com/3/math.htm
Area and Perimeter:
http://interactivesites.weebly.com/areaperimeter.html
https://www.youtube.com/watch?v=7hFhL5h0Woo
https://www.youtube.com/watch?v=Xk-PyhjFWw4
https://www.youtube.com/watch?v=-jeOb9cEDWA
Rounding numbers to the nearest ten and hundred:
http://www.freevideosforautistickids.com/Rounding_Numbers.html
http://www.webmath.com/k8round.html
http://www.youtube.com/watch?v=3afU6JQG15I http://www.onlinemathlearning.com/rounding-numbers-2.html
PEMDAS with Mr. C:
http://www.youtube.com/watch?v=OWyxWg2-LTY
Equabeam:
http://illuminations.nctm.org/ActivityDetail.aspx?ID=26