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1. \(35 + \ldots = 40\)
2. \(67 + \ldots = 70\)
3. \(71 + \ldots = 80\)
4. \(\ldots + 7 = 50\)
5. \(\ldots + 6 = 90\)
6. \(88 + \ldots = 90\)
7. \(\ldots + 1 = 30\)
8. \(\ldots + 4 = 50\)
9. \(\ldots + 5 = 50\)
10. \(43 + \ldots = 50\)
11. \(42 + \ldots = 50\)
12. \(\ldots + 8 = 90\)

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Verbetersleutel

1. \(35 + 5 = 40\)
2. \(67 + 3 = 70\)
3. \(71 + 9 = 80\)
4. \(43 + 7 =50\)
5. \(84 + 6 =90\)
6. \(88 + 2 = 90\)
7. \(29 + 1 =30\)
8. \(46 + 4 =50\)
9. \(45 + 5 =50\)
10. \(43 + 7 = 50\)
11. \(42 + 8 = 50\)
12. \(82 + 8 =90\)