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1. \(43 + \ldots = 50\)
2. \(19 + \ldots = 20\)
3. \(32 + \ldots = 40\)
4. \(\ldots + 6 = 40\)
5. \(27 + \ldots = 30\)
6. \(\ldots + 8 = 30\)
7. \(\ldots + 9 = 30\)
8. \(\ldots + 3 = 80\)
9. \(86 + \ldots = 90\)
10. \(24 + \ldots = 30\)
11. \(\ldots + 2 = 80\)
12. \(15 + \ldots = 20\)

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Verbetersleutel

1. \(43 + 7 = 50\)
2. \(19 + 1 = 20\)
3. \(32 + 8 = 40\)
4. \(34 + 6 =40\)
5. \(27 + 3 = 30\)
6. \(22 + 8 =30\)
7. \(21 + 9 =30\)
8. \(77 + 3 =80\)
9. \(86 + 4 = 90\)
10. \(24 + 6 = 30\)
11. \(78 + 2 =80\)
12. \(15 + 5 = 20\)