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1. \(25 + \ldots = 30\)
2. \(99 + \ldots = 100\)
3. \(42 + \ldots = 50\)
4. \(\ldots + 8 = 70\)
5. \(\ldots + 9 = 70\)
6. \(41 + \ldots = 50\)
7. \(33 + \ldots = 40\)
8. \(\ldots + 1 = 20\)
9. \(84 + \ldots = 90\)
10. \(\ldots + 4 = 60\)
11. \(57 + \ldots = 60\)
12. \(\ldots + 5 = 50\)

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Verbetersleutel

1. \(25 + 5 = 30\)
2. \(99 + 1 = 100\)
3. \(42 + 8 = 50\)
4. \(62 + 8 =70\)
5. \(61 + 9 =70\)
6. \(41 + 9 = 50\)
7. \(33 + 7 = 40\)
8. \(19 + 1 =20\)
9. \(84 + 6 = 90\)
10. \(56 + 4 =60\)
11. \(57 + 3 = 60\)
12. \(45 + 5 =50\)