7 Plusaufgaben am Zwanzigerfeld 4 5 6 3 + 1 = 2 + 4 = + = + = + = + = + = + = 4 + 1 = 4 + 2 = 4 + 3 = 7 + 1 = 7 + 2 = 7 + 3 = 6 + 2 = 6 + 3 = 6 + 4 = 9 + 1 = 9 + 2 = 9 + 3 = Nur zu Prüfzwecken – Eigentum des Verlags öbv
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