Free iPad app: https://itunes.apple.com/us/app/sink-or-float-free/id605625765?mt=8&uo=4&at=10l6SU
Free iPhone app: https://itunes.apple.com/us/app/sink-or-float-free/id605625765?mt=8&uo=4&at=10l6SU
Paid iPad app: https://itunes.apple.com/us/app/sink-or-float-fun-game-teaching/id605161477?mt=8&uo=4&at=10l6SU
Paid iPhone app: https://itunes.apple.com/us/app/sink-or-float-fun-game-teaching/id605161477?mt=8&uo=4&at=10l6SU
Free Android Phone app: https://play.google.com/store/apps/details?id=com.donkeysoft.SinkOrFloatLite
Paid Android Phone app: https://play.google.com/store/apps/details?id=com.donkeysoft
Website: http://www.sumdog.com/
Free iPad app: http://itunes.apple.com/us/app/motion-math-hungry-fish/id483049169?mt=8&uo=4&at=10l6SU
Free iPhone app: http://itunes.apple.com/us/app/motion-math-hungry-fish/id483049169?mt=8&uo=4&at=10l6SU
Free iPad app: http://itunes.apple.com/us/app/motion-math-zoom/id451793073?mt=8&uo=4&at=10l6SU
Free iPhone app: http://itunes.apple.com/us/app/motion-math-zoom/id451793073?mt=8&uo=4&at=10l6SU
Free iPhone app: https://itunes.apple.com/us/app/geoboard-by-math-learning/id519896952?mt=8&uo=4&at=10l6SU
Free iPad app: https://itunes.apple.com/us/app/geoboard-by-math-learning/id519896952?mt=8&uo=4&at=10l6SU
Website: http://www.mathlearningcenter.org/web-apps/geoboard/
Google Chrome app: https://chrome.google.com/webstore/detail/geoboard-by-the-math-lear/gaakmmdiopnmcenkojohldanladpajak
Free iPad app: https://itunes.apple.com/us/app/number-pieces-basic-by-math/id611452042?mt=8&uo=4&at=10l6SU
Website: http://www.mathlearningcenter.org/web-apps/number-pieces/