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1. \(91 + \ldots = 100\)
2. \(47 + \ldots = 50\)
3. \(38 + \ldots = 40\)
4. \(54 + \ldots = 60\)
5. \(\ldots + 1 = 100\)
6. \(96 + \ldots = 100\)
7. \(\ldots + 4 = 70\)
8. \(\ldots + 9 = 40\)
9. \(35 + \ldots = 40\)
10. \(\ldots + 5 = 60\)
11. \(\ldots + 2 = 50\)
12. \(\ldots + 8 = 50\)

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Verbetersleutel

1. \(91 + 9 = 100\)
2. \(47 + 3 = 50\)
3. \(38 + 2 = 40\)
4. \(54 + 6 = 60\)
5. \(99 + 1 =100\)
6. \(96 + 4 = 100\)
7. \(66 + 4 =70\)
8. \(31 + 9 =40\)
9. \(35 + 5 = 40\)
10. \(55 + 5 =60\)
11. \(48 + 2 =50\)
12. \(42 + 8 =50\)