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1. \(51 + \ldots = 60\)
2. \(86 + \ldots = 90\)
3. \(\ldots + 4 = 80\)
4. \(52 + \ldots = 60\)
5. \(\ldots + 9 = 70\)
6. \(33 + \ldots = 40\)
7. \(\ldots + 1 = 80\)
8. \(54 + \ldots = 60\)
9. \(\ldots + 5 = 50\)
10. \(\ldots + 8 = 80\)
11. \(\ldots + 3 = 100\)
12. \(28 + \ldots = 30\)

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Verbetersleutel

1. \(51 + 9 = 60\)
2. \(86 + 4 = 90\)
3. \(76 + 4 =80\)
4. \(52 + 8 = 60\)
5. \(61 + 9 =70\)
6. \(33 + 7 = 40\)
7. \(79 + 1 =80\)
8. \(54 + 6 = 60\)
9. \(45 + 5 =50\)
10. \(72 + 8 =80\)
11. \(97 + 3 =100\)
12. \(28 + 2 = 30\)