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1. \(\ldots + 1 = 20\)
2. \(\ldots + 7 = 50\)
3. \(\ldots + 9 = 70\)
4. \(\ldots + 5 = 50\)
5. \(\ldots + 4 = 30\)
6. \(\ldots + 6 = 50\)
7. \(91 + \ldots = 100\)
8. \(36 + \ldots = 40\)
9. \(\ldots + 2 = 90\)
10. \(27 + \ldots = 30\)
11. \(\ldots + 8 = 60\)
12. \(44 + \ldots = 50\)

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Verbetersleutel

1. \(19 + 1 =20\)
2. \(43 + 7 =50\)
3. \(61 + 9 =70\)
4. \(45 + 5 =50\)
5. \(26 + 4 =30\)
6. \(44 + 6 =50\)
7. \(91 + 9 = 100\)
8. \(36 + 4 = 40\)
9. \(88 + 2 =90\)
10. \(27 + 3 = 30\)
11. \(52 + 8 =60\)
12. \(44 + 6 = 50\)