Richtig: 1+1=2, 2+2=4, 3+3=6, 4+4=8, 5+5=10, 6+6=12, 7+7=14, 8+8=16, 9+9=18, 10+10=20, 11+11=22, 12+12=24, 2+1=3, 3+2=5, 4+3=7, 5+4=9, 6+5=11, 7+6=13, 8+7=15, 9+8=17, 10+9=19, 11+10=21, 12+11=23, 13+12=25, 4+2=6, 5+3=8, 6+4=10, 7+5=12, 8+6=14, 9+7=16, Falsch: 1+1=11, 2+2=22, 3+3=3, 4+4=12, 5+5=15, 6+6=21, 7+7=41, 8+8=61, 9+9=81, 10+10=30, 11+11=11, 12+12=42, 2+1=4, 3+2=32, 4+3=43, 5+4=8, 6+5=10, 7+6=31, 8+7=51, 9+8=71, 10+9=91, 11+10=12, 12+11=32, 13+12=52, 4+2=5, 5+3=6, 6+4=11, 7+5=21, 8+6=41, 9+7=61,

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