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1. \(98 + \ldots = 100\)
2. \(\ldots + 3 = 80\)
3. \(\ldots + 2 = 70\)
4. \(13 + \ldots = 20\)
5. \(87 + \ldots = 90\)
6. \(34 + \ldots = 40\)
7. \(55 + \ldots = 60\)
8. \(12 + \ldots = 20\)
9. \(\ldots + 7 = 80\)
10. \(\ldots + 8 = 90\)
11. \(36 + \ldots = 40\)
12. \(19 + \ldots = 20\)

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Verbetersleutel

1. \(98 + 2 = 100\)
2. \(77 + 3 =80\)
3. \(68 + 2 =70\)
4. \(13 + 7 = 20\)
5. \(87 + 3 = 90\)
6. \(34 + 6 = 40\)
7. \(55 + 5 = 60\)
8. \(12 + 8 = 20\)
9. \(73 + 7 =80\)
10. \(82 + 8 =90\)
11. \(36 + 4 = 40\)
12. \(19 + 1 = 20\)