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1. \(41 + \ldots = 50\)
2. \(55 + \ldots = 60\)
3. \(\ldots + 6 = 80\)
4. \(37 + \ldots = 40\)
5. \(\ldots + 8 = 100\)
6. \(96 + \ldots = 100\)
7. \(79 + \ldots = 80\)
8. \(14 + \ldots = 20\)
9. \(\ldots + 1 = 60\)
10. \(13 + \ldots = 20\)
11. \(\ldots + 7 = 60\)
12. \(\ldots + 9 = 70\)

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Verbetersleutel

1. \(41 + 9 = 50\)
2. \(55 + 5 = 60\)
3. \(74 + 6 =80\)
4. \(37 + 3 = 40\)
5. \(92 + 8 =100\)
6. \(96 + 4 = 100\)
7. \(79 + 1 = 80\)
8. \(14 + 6 = 20\)
9. \(59 + 1 =60\)
10. \(13 + 7 = 20\)
11. \(53 + 7 =60\)
12. \(61 + 9 =70\)