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1. \(28 + \ldots = 30\)
2. \(14 + \ldots = 20\)
3. \(\ldots + 4 = 60\)
4. \(93 + \ldots = 100\)
5. \(\ldots + 9 = 60\)
6. \(\ldots + 5 = 100\)
7. \(\ldots + 6 = 40\)
8. \(69 + \ldots = 70\)
9. \(\ldots + 2 = 100\)
10. \(\ldots + 3 = 70\)
11. \(75 + \ldots = 80\)
12. \(11 + \ldots = 20\)

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Verbetersleutel

1. \(28 + 2 = 30\)
2. \(14 + 6 = 20\)
3. \(56 + 4 =60\)
4. \(93 + 7 = 100\)
5. \(51 + 9 =60\)
6. \(95 + 5 =100\)
7. \(34 + 6 =40\)
8. \(69 + 1 = 70\)
9. \(98 + 2 =100\)
10. \(67 + 3 =70\)
11. \(75 + 5 = 80\)
12. \(11 + 9 = 20\)