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1. \(\ldots + 9 = 40\)
2. \(\ldots + 6 = 20\)
3. \(82 + \ldots = 90\)
4. \(\ldots + 4 = 80\)
5. \(16 + \ldots = 20\)
6. \(\ldots + 1 = 30\)
7. \(75 + \ldots = 80\)
8. \(19 + \ldots = 20\)
9. \(31 + \ldots = 40\)
10. \(\ldots + 2 = 30\)
11. \(\ldots + 5 = 20\)
12. \(\ldots + 7 = 60\)

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Verbetersleutel

1. \(31 + 9 =40\)
2. \(14 + 6 =20\)
3. \(82 + 8 = 90\)
4. \(76 + 4 =80\)
5. \(16 + 4 = 20\)
6. \(29 + 1 =30\)
7. \(75 + 5 = 80\)
8. \(19 + 1 = 20\)
9. \(31 + 9 = 40\)
10. \(28 + 2 =30\)
11. \(15 + 5 =20\)
12. \(53 + 7 =60\)