http://www.abcya.com/addition.htm
http://www.internet4classrooms.com/skill_builders/estimation_math_fourth_4th_grade.htm
http://www.thinkfinity.org/welcome
http://www.smartygames.com/index.php
http://www.readwritethink.org
Technology resources
http://incompetech.com/music/royalty-free/ (sounds)
http://animoto.com/projects (create videos)
http://www.morguefile.comhttp://www.thinkfinity.org/welcome
https://www.teachingchannel.org/?national=1
http://www.sumdog.com/teacher
http://www.internet4classrooms.com/skill_builders/estimation_math_fourth_4th_grade.htm
http://www.thinkfinity.org/welcome
http://www.smartygames.com/index.php
http://www.readwritethink.org
Technology resources
http://incompetech.com/music/royalty-free/ (sounds)
http://animoto.com/projects (create videos)
http://www.morguefile.comhttp://www.thinkfinity.org/welcome
https://www.teachingchannel.org/?national=1
http://www.sumdog.com/teacher