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1. \(\ldots + 9 = 20\)
2. \(49 + \ldots = 50\)
3. \(\ldots + 6 = 30\)
4. \(\ldots + 8 = 30\)
5. \(\ldots + 5 = 80\)
6. \(\ldots + 3 = 40\)
7. \(42 + \ldots = 50\)
8. \(18 + \ldots = 20\)
9. \(\ldots + 4 = 70\)
10. \(\ldots + 2 = 70\)
11. \(56 + \ldots = 60\)
12. \(27 + \ldots = 30\)

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Verbetersleutel

1. \(11 + 9 =20\)
2. \(49 + 1 = 50\)
3. \(24 + 6 =30\)
4. \(22 + 8 =30\)
5. \(75 + 5 =80\)
6. \(37 + 3 =40\)
7. \(42 + 8 = 50\)
8. \(18 + 2 = 20\)
9. \(66 + 4 =70\)
10. \(68 + 2 =70\)
11. \(56 + 4 = 60\)
12. \(27 + 3 = 30\)