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1. \(\ldots + 8 = 100\)
2. \(86 + \ldots = 90\)
3. \(18 + \ldots = 20\)
4. \(39 + \ldots = 40\)
5. \(\ldots + 2 = 90\)
6. \(42 + \ldots = 50\)
7. \(\ldots + 9 = 40\)
8. \(\ldots + 7 = 60\)
9. \(37 + \ldots = 40\)
10. \(\ldots + 1 = 100\)
11. \(43 + \ldots = 50\)
12. \(64 + \ldots = 70\)

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Verbetersleutel

1. \(92 + 8 =100\)
2. \(86 + 4 = 90\)
3. \(18 + 2 = 20\)
4. \(39 + 1 = 40\)
5. \(88 + 2 =90\)
6. \(42 + 8 = 50\)
7. \(31 + 9 =40\)
8. \(53 + 7 =60\)
9. \(37 + 3 = 40\)
10. \(99 + 1 =100\)
11. \(43 + 7 = 50\)
12. \(64 + 6 = 70\)