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1. \(\ldots + 8 = 70\)
2. \(75 + \ldots = 80\)
3. \(\ldots + 9 = 90\)
4. \(\ldots + 5 = 70\)
5. \(96 + \ldots = 100\)
6. \(\ldots + 2 = 30\)
7. \(\ldots + 4 = 70\)
8. \(61 + \ldots = 70\)
9. \(38 + \ldots = 40\)
10. \(\ldots + 1 = 70\)
11. \(72 + \ldots = 80\)
12. \(13 + \ldots = 20\)

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Verbetersleutel

1. \(62 + 8 =70\)
2. \(75 + 5 = 80\)
3. \(81 + 9 =90\)
4. \(65 + 5 =70\)
5. \(96 + 4 = 100\)
6. \(28 + 2 =30\)
7. \(66 + 4 =70\)
8. \(61 + 9 = 70\)
9. \(38 + 2 = 40\)
10. \(69 + 1 =70\)
11. \(72 + 8 = 80\)
12. \(13 + 7 = 20\)