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1. \(96 + \ldots = 100\)
2. \(21 + \ldots = 30\)
3. \(\ldots + 6 = 80\)
4. \(\ldots + 3 = 50\)
5. \(87 + \ldots = 90\)
6. \(\ldots + 1 = 20\)
7. \(\ldots + 5 = 70\)
8. \(\ldots + 2 = 20\)
9. \(89 + \ldots = 90\)
10. \(34 + \ldots = 40\)
11. \(22 + \ldots = 30\)
12. \(\ldots + 8 = 50\)

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Verbetersleutel

1. \(96 + 4 = 100\)
2. \(21 + 9 = 30\)
3. \(74 + 6 =80\)
4. \(47 + 3 =50\)
5. \(87 + 3 = 90\)
6. \(19 + 1 =20\)
7. \(65 + 5 =70\)
8. \(18 + 2 =20\)
9. \(89 + 1 = 90\)
10. \(34 + 6 = 40\)
11. \(22 + 8 = 30\)
12. \(42 + 8 =50\)