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1. \(61 + \ldots = 70\)
2. \(68 + \ldots = 70\)
3. \(\ldots + 5 = 50\)
4. \(34 + \ldots = 40\)
5. \(\ldots + 3 = 30\)
6. \(\ldots + 9 = 60\)
7. \(\ldots + 6 = 100\)
8. \(\ldots + 8 = 20\)
9. \(62 + \ldots = 70\)
10. \(\ldots + 4 = 20\)
11. \(\ldots + 1 = 70\)
12. \(47 + \ldots = 50\)

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Verbetersleutel

1. \(61 + 9 = 70\)
2. \(68 + 2 = 70\)
3. \(45 + 5 =50\)
4. \(34 + 6 = 40\)
5. \(27 + 3 =30\)
6. \(51 + 9 =60\)
7. \(94 + 6 =100\)
8. \(12 + 8 =20\)
9. \(62 + 8 = 70\)
10. \(16 + 4 =20\)
11. \(69 + 1 =70\)
12. \(47 + 3 = 50\)