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1. \(\ldots + 2 = 50\)
2. \(\ldots + 9 = 50\)
3. \(95 + \ldots = 100\)
4. \(\ldots + 1 = 100\)
5. \(31 + \ldots = 40\)
6. \(74 + \ldots = 80\)
7. \(\ldots + 8 = 100\)
8. \(93 + \ldots = 100\)
9. \(\ldots + 4 = 100\)
10. \(47 + \ldots = 50\)
11. \(38 + \ldots = 40\)
12. \(96 + \ldots = 100\)

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Verbetersleutel

1. \(48 + 2 =50\)
2. \(41 + 9 =50\)
3. \(95 + 5 = 100\)
4. \(99 + 1 =100\)
5. \(31 + 9 = 40\)
6. \(74 + 6 = 80\)
7. \(92 + 8 =100\)
8. \(93 + 7 = 100\)
9. \(96 + 4 =100\)
10. \(47 + 3 = 50\)
11. \(38 + 2 = 40\)
12. \(96 + 4 = 100\)