Kopfrechnen

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==== '''<big><span style="color: darksalmon">Kopfrechnen</span></big>''' ====
<iframe src="http://LearningApps.org/watch?app=55774" style="border:0px;width:100%;height:400px" webkitallowfullscreen="true" mozallowfullscreen="true"></iframe>
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<iframe src="http://LearningApps.org/watch?app=259" style="border:0px;width:100%;height:500px" webkitallowfullscreen="true" mozallowfullscreen="true"></iframe>
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<iframe src="http://LearningApps.org/watch?app=97" style="border:0px;width:100%;height:500px" webkitallowfullscreen="true" mozallowfullscreen="true"></iframe>
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<iframe src="http://LearningApps.org/watch?app=12048" style="border:0px;width:100%;height:400px" webkitallowfullscreen="true" mozallowfullscreen="true"></iframe>

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