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1. \(57 + \ldots = 60\)
2. \(\ldots + 8 = 50\)
3. \(\ldots + 3 = 50\)
4. \(69 + \ldots = 70\)
5. \(31 + \ldots = 40\)
6. \(\ldots + 9 = 80\)
7. \(\ldots + 6 = 20\)
8. \(28 + \ldots = 30\)
9. \(75 + \ldots = 80\)
10. \(46 + \ldots = 50\)
11. \(\ldots + 2 = 30\)
12. \(12 + \ldots = 20\)

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Verbetersleutel

1. \(57 + 3 = 60\)
2. \(42 + 8 =50\)
3. \(47 + 3 =50\)
4. \(69 + 1 = 70\)
5. \(31 + 9 = 40\)
6. \(71 + 9 =80\)
7. \(14 + 6 =20\)
8. \(28 + 2 = 30\)
9. \(75 + 5 = 80\)
10. \(46 + 4 = 50\)
11. \(28 + 2 =30\)
12. \(12 + 8 = 20\)