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1. \(\ldots + 6 = 20\)
2. \(59 + \ldots = 60\)
3. \(78 + \ldots = 80\)
4. \(76 + \ldots = 80\)
5. \(23 + \ldots = 30\)
6. \(62 + \ldots = 70\)
7. \(95 + \ldots = 100\)
8. \(\ldots + 9 = 50\)
9. \(\ldots + 7 = 60\)
10. \(\ldots + 1 = 100\)
11. \(\ldots + 4 = 80\)
12. \(34 + \ldots = 40\)

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Verbetersleutel

1. \(14 + 6 =20\)
2. \(59 + 1 = 60\)
3. \(78 + 2 = 80\)
4. \(76 + 4 = 80\)
5. \(23 + 7 = 30\)
6. \(62 + 8 = 70\)
7. \(95 + 5 = 100\)
8. \(41 + 9 =50\)
9. \(53 + 7 =60\)
10. \(99 + 1 =100\)
11. \(76 + 4 =80\)
12. \(34 + 6 = 40\)