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1. \(\ldots + 3 = 90\)
2. \(25 + \ldots = 30\)
3. \(88 + \ldots = 90\)
4. \(94 + \ldots = 100\)
5. \(\ldots + 6 = 90\)
6. \(33 + \ldots = 40\)
7. \(\ldots + 9 = 30\)
8. \(31 + \ldots = 40\)
9. \(\ldots + 5 = 50\)
10. \(\ldots + 2 = 50\)
11. \(72 + \ldots = 80\)
12. \(47 + \ldots = 50\)

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Verbetersleutel

1. \(87 + 3 =90\)
2. \(25 + 5 = 30\)
3. \(88 + 2 = 90\)
4. \(94 + 6 = 100\)
5. \(84 + 6 =90\)
6. \(33 + 7 = 40\)
7. \(21 + 9 =30\)
8. \(31 + 9 = 40\)
9. \(45 + 5 =50\)
10. \(48 + 2 =50\)
11. \(72 + 8 = 80\)
12. \(47 + 3 = 50\)