Students can answer anonymously to provocations or you can use it for assessment. Frequently entered answer are bigger than others.
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Free Android Phone app: https://play.google.com/store/apps/details?id=com.quizizz_mobile
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Free Android Phone app: https://play.google.com/store/apps/details?id=no.mobitroll.kahoot.android
Free Android Tablet app: https://play.google.com/store/apps/details?id=no.mobitroll.kahoot.android
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Google Chrome app: https://chrome.google.com/webstore/detail/google-forms/jhknlonaankphkkbnmjdlpehkinifeeg
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Free Mac program: http://www.polleverywhere.com/macpresenter
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Website: https://www.smartestk12.com/
Website: http://exitticket.org/