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1. \(31 + \ldots = 40\)
2. \(63 + \ldots = 70\)
3. \(19 + \ldots = 20\)
4. \(92 + \ldots = 100\)
5. \(58 + \ldots = 60\)
6. \(\ldots + 2 = 80\)
7. \(\ldots + 7 = 60\)
8. \(\ldots + 1 = 60\)
9. \(37 + \ldots = 40\)
10. \(96 + \ldots = 100\)
11. \(\ldots + 4 = 90\)
12. \(34 + \ldots = 40\)

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Verbetersleutel

1. \(31 + 9 = 40\)
2. \(63 + 7 = 70\)
3. \(19 + 1 = 20\)
4. \(92 + 8 = 100\)
5. \(58 + 2 = 60\)
6. \(78 + 2 =80\)
7. \(53 + 7 =60\)
8. \(59 + 1 =60\)
9. \(37 + 3 = 40\)
10. \(96 + 4 = 100\)
11. \(86 + 4 =90\)
12. \(34 + 6 = 40\)