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1. \(\ldots + 4 = 30\)
2. \(63 + \ldots = 70\)
3. \(41 + \ldots = 50\)
4. \(\ldots + 8 = 30\)
5. \(57 + \ldots = 60\)
6. \(84 + \ldots = 90\)
7. \(\ldots + 2 = 50\)
8. \(65 + \ldots = 70\)
9. \(96 + \ldots = 100\)
10. \(\ldots + 9 = 80\)
11. \(92 + \ldots = 100\)
12. \(\ldots + 5 = 40\)

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Verbetersleutel

1. \(26 + 4 =30\)
2. \(63 + 7 = 70\)
3. \(41 + 9 = 50\)
4. \(22 + 8 =30\)
5. \(57 + 3 = 60\)
6. \(84 + 6 = 90\)
7. \(48 + 2 =50\)
8. \(65 + 5 = 70\)
9. \(96 + 4 = 100\)
10. \(71 + 9 =80\)
11. \(92 + 8 = 100\)
12. \(35 + 5 =40\)