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1. \(49 + \ldots = 50\)
2. \(54 + \ldots = 60\)
3. \(31 + \ldots = 40\)
4. \(\ldots + 5 = 30\)
5. \(\ldots + 6 = 30\)
6. \(18 + \ldots = 20\)
7. \(\ldots + 4 = 90\)
8. \(85 + \ldots = 90\)
9. \(66 + \ldots = 70\)
10. \(\ldots + 8 = 90\)
11. \(62 + \ldots = 70\)
12. \(\ldots + 7 = 30\)

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Verbetersleutel

1. \(49 + 1 = 50\)
2. \(54 + 6 = 60\)
3. \(31 + 9 = 40\)
4. \(25 + 5 =30\)
5. \(24 + 6 =30\)
6. \(18 + 2 = 20\)
7. \(86 + 4 =90\)
8. \(85 + 5 = 90\)
9. \(66 + 4 = 70\)
10. \(82 + 8 =90\)
11. \(62 + 8 = 70\)
12. \(23 + 7 =30\)