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1. \(68 + \ldots = 70\)
2. \(27 + \ldots = 30\)
3. \(\ldots + 7 = 100\)
4. \(19 + \ldots = 20\)
5. \(\ldots + 4 = 90\)
6. \(\ldots + 6 = 30\)
7. \(\ldots + 9 = 40\)
8. \(21 + \ldots = 30\)
9. \(86 + \ldots = 90\)
10. \(\ldots + 3 = 50\)
11. \(94 + \ldots = 100\)
12. \(\ldots + 5 = 60\)

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Verbetersleutel

1. \(68 + 2 = 70\)
2. \(27 + 3 = 30\)
3. \(93 + 7 =100\)
4. \(19 + 1 = 20\)
5. \(86 + 4 =90\)
6. \(24 + 6 =30\)
7. \(31 + 9 =40\)
8. \(21 + 9 = 30\)
9. \(86 + 4 = 90\)
10. \(47 + 3 =50\)
11. \(94 + 6 = 100\)
12. \(55 + 5 =60\)