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1. \(\ldots + 2 = 80\)
2. \(55 + \ldots = 60\)
3. \(28 + \ldots = 30\)
4. \(\ldots + 5 = 20\)
5. \(77 + \ldots = 80\)
6. \(\ldots + 9 = 70\)
7. \(44 + \ldots = 50\)
8. \(\ldots + 8 = 80\)
9. \(\ldots + 3 = 40\)
10. \(61 + \ldots = 70\)
11. \(69 + \ldots = 70\)
12. \(46 + \ldots = 50\)

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Verbetersleutel

1. \(78 + 2 =80\)
2. \(55 + 5 = 60\)
3. \(28 + 2 = 30\)
4. \(15 + 5 =20\)
5. \(77 + 3 = 80\)
6. \(61 + 9 =70\)
7. \(44 + 6 = 50\)
8. \(72 + 8 =80\)
9. \(37 + 3 =40\)
10. \(61 + 9 = 70\)
11. \(69 + 1 = 70\)
12. \(46 + 4 = 50\)