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1. \(\ldots + 8 = 40\)
2. \(72 + \ldots = 80\)
3. \(\ldots + 1 = 90\)
4. \(\ldots + 2 = 50\)
5. \(87 + \ldots = 90\)
6. \(\ldots + 7 = 30\)
7. \(43 + \ldots = 50\)
8. \(\ldots + 6 = 60\)
9. \(\ldots + 3 = 90\)
10. \(31 + \ldots = 40\)
11. \(48 + \ldots = 50\)
12. \(\ldots + 4 = 40\)

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Verbetersleutel

1. \(32 + 8 =40\)
2. \(72 + 8 = 80\)
3. \(89 + 1 =90\)
4. \(48 + 2 =50\)
5. \(87 + 3 = 90\)
6. \(23 + 7 =30\)
7. \(43 + 7 = 50\)
8. \(54 + 6 =60\)
9. \(87 + 3 =90\)
10. \(31 + 9 = 40\)
11. \(48 + 2 = 50\)
12. \(36 + 4 =40\)