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1. \(57 + \ldots = 60\)
2. \(56 + \ldots = 60\)
3. \(34 + \ldots = 40\)
4. \(\ldots + 2 = 60\)
5. \(45 + \ldots = 50\)
6. \(\ldots + 5 = 80\)
7. \(\ldots + 3 = 40\)
8. \(\ldots + 4 = 30\)
9. \(69 + \ldots = 70\)
10. \(\ldots + 6 = 100\)
11. \(\ldots + 8 = 30\)
12. \(81 + \ldots = 90\)

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Verbetersleutel

1. \(57 + 3 = 60\)
2. \(56 + 4 = 60\)
3. \(34 + 6 = 40\)
4. \(58 + 2 =60\)
5. \(45 + 5 = 50\)
6. \(75 + 5 =80\)
7. \(37 + 3 =40\)
8. \(26 + 4 =30\)
9. \(69 + 1 = 70\)
10. \(94 + 6 =100\)
11. \(22 + 8 =30\)
12. \(81 + 9 = 90\)