Free iPad app: https://itunes.apple.com/ca/app/virtual-manipulatives!/id471341079?mt=8&uo=4&at=10l6SU
Website: http://www.pbs.org/teachers
Website: http://www.readwritethink.org/
Website: http://interactivesites.weebly.com/
Free iPad app: http://itunes.apple.com/us/app/pearson-dash/id471339475?mt=8&uo=4&at=10l6SU
Website: http://www.educade.org/
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Website: http://www.problem-attic.com/