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1. \(\ldots + 9 = 40\)
2. \(89 + \ldots = 90\)
3. \(23 + \ldots = 30\)
4. \(\ldots + 6 = 90\)
5. \(12 + \ldots = 20\)
6. \(18 + \ldots = 20\)
7. \(46 + \ldots = 50\)
8. \(\ldots + 4 = 50\)
9. \(77 + \ldots = 80\)
10. \(\ldots + 8 = 20\)
11. \(74 + \ldots = 80\)
12. \(71 + \ldots = 80\)

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Verbetersleutel

1. \(31 + 9 =40\)
2. \(89 + 1 = 90\)
3. \(23 + 7 = 30\)
4. \(84 + 6 =90\)
5. \(12 + 8 = 20\)
6. \(18 + 2 = 20\)
7. \(46 + 4 = 50\)
8. \(46 + 4 =50\)
9. \(77 + 3 = 80\)
10. \(12 + 8 =20\)
11. \(74 + 6 = 80\)
12. \(71 + 9 = 80\)