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1. \(\ldots + 8 = 60\)
2. \(59 + \ldots = 60\)
3. \(\ldots + 5 = 80\)
4. \(72 + \ldots = 80\)
5. \(48 + \ldots = 50\)
6. \(81 + \ldots = 90\)
7. \(35 + \ldots = 40\)
8. \(83 + \ldots = 90\)
9. \(67 + \ldots = 70\)
10. \(\ldots + 1 = 30\)
11. \(\ldots + 3 = 20\)
12. \(36 + \ldots = 40\)

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Verbetersleutel

1. \(52 + 8 =60\)
2. \(59 + 1 = 60\)
3. \(75 + 5 =80\)
4. \(72 + 8 = 80\)
5. \(48 + 2 = 50\)
6. \(81 + 9 = 90\)
7. \(35 + 5 = 40\)
8. \(83 + 7 = 90\)
9. \(67 + 3 = 70\)
10. \(29 + 1 =30\)
11. \(17 + 3 =20\)
12. \(36 + 4 = 40\)