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1. \(\ldots + 9 = 20\)
2. \(\ldots + 2 = 80\)
3. \(\ldots + 6 = 80\)
4. \(47 + \ldots = 50\)
5. \(\ldots + 5 = 50\)
6. \(\ldots + 4 = 80\)
7. \(35 + \ldots = 40\)
8. \(64 + \ldots = 70\)
9. \(53 + \ldots = 60\)
10. \(49 + \ldots = 50\)
11. \(88 + \ldots = 90\)
12. \(\ldots + 8 = 30\)

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Verbetersleutel

1. \(11 + 9 =20\)
2. \(78 + 2 =80\)
3. \(74 + 6 =80\)
4. \(47 + 3 = 50\)
5. \(45 + 5 =50\)
6. \(76 + 4 =80\)
7. \(35 + 5 = 40\)
8. \(64 + 6 = 70\)
9. \(53 + 7 = 60\)
10. \(49 + 1 = 50\)
11. \(88 + 2 = 90\)
12. \(22 + 8 =30\)