Richtig: 15+4=19, 17-4=13, 42+6=48, 78-5=73, 30+6=36, 60-6=54, 56+8=64, 83-7=76, 43+30=73, 97-60=37, Falsche: 15+4=18, 17-4=14, 42+6=49, 78-5=72, 30+6=33, 60-6=64, 56+8=65, 83-7=77, 43+30=74, 97-60=27,

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