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1. \(\ldots + 7 = 30\)
2. \(78 + \ldots = 80\)
3. \(\ldots + 3 = 60\)
4. \(81 + \ldots = 90\)
5. \(24 + \ldots = 30\)
6. \(97 + \ldots = 100\)
7. \(86 + \ldots = 90\)
8. \(29 + \ldots = 30\)
9. \(\ldots + 5 = 80\)
10. \(32 + \ldots = 40\)
11. \(\ldots + 2 = 50\)
12. \(\ldots + 8 = 60\)

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Verbetersleutel

1. \(23 + 7 =30\)
2. \(78 + 2 = 80\)
3. \(57 + 3 =60\)
4. \(81 + 9 = 90\)
5. \(24 + 6 = 30\)
6. \(97 + 3 = 100\)
7. \(86 + 4 = 90\)
8. \(29 + 1 = 30\)
9. \(75 + 5 =80\)
10. \(32 + 8 = 40\)
11. \(48 + 2 =50\)
12. \(52 + 8 =60\)