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1. \(\ldots + 6 = 80\)
2. \(64 + \ldots = 70\)
3. \(\ldots + 8 = 100\)
4. \(78 + \ldots = 80\)
5. \(\ldots + 4 = 70\)
6. \(\ldots + 5 = 90\)
7. \(\ldots + 2 = 40\)
8. \(11 + \ldots = 20\)
9. \(37 + \ldots = 40\)
10. \(49 + \ldots = 50\)
11. \(\ldots + 7 = 20\)
12. \(\ldots + 3 = 70\)

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Verbetersleutel

1. \(74 + 6 =80\)
2. \(64 + 6 = 70\)
3. \(92 + 8 =100\)
4. \(78 + 2 = 80\)
5. \(66 + 4 =70\)
6. \(85 + 5 =90\)
7. \(38 + 2 =40\)
8. \(11 + 9 = 20\)
9. \(37 + 3 = 40\)
10. \(49 + 1 = 50\)
11. \(13 + 7 =20\)
12. \(67 + 3 =70\)