TurtleDiary.com is an excellent site which provides online learning games and activities for children.
Games and activities are created by well-qualified teachers and educators who believe that learning should be easy and fun. A comprehensive understanding of concepts in Language, Social Studies, Math, Science, etc. is reinforced with the help of fun and educational activities. TurtleDiary tracks progress on skills as they are being practiced, and generates detailed performance reports to give valuable insight on your kids' or students' abilities.
Online kids' games can be easily used on interactive whiteboards. They are offering a free membership to schools. Teachers need to register with their school email address and they will get unlimited access to games and activities.
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On YouTube: https://www.youtube.com/user/turtlediarydotcom