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1. \(17 + \ldots = 20\)
2. \(71 + \ldots = 80\)
3. \(\ldots + 3 = 30\)
4. \(\ldots + 7 = 100\)
5. \(54 + \ldots = 60\)
6. \(\ldots + 4 = 80\)
7. \(\ldots + 9 = 90\)
8. \(33 + \ldots = 40\)
9. \(16 + \ldots = 20\)
10. \(\ldots + 2 = 90\)
11. \(\ldots + 6 = 70\)
12. \(\ldots + 5 = 90\)

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Verbetersleutel

1. \(17 + 3 = 20\)
2. \(71 + 9 = 80\)
3. \(27 + 3 =30\)
4. \(93 + 7 =100\)
5. \(54 + 6 = 60\)
6. \(76 + 4 =80\)
7. \(81 + 9 =90\)
8. \(33 + 7 = 40\)
9. \(16 + 4 = 20\)
10. \(88 + 2 =90\)
11. \(64 + 6 =70\)
12. \(85 + 5 =90\)