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1. \(\ldots + 8 = 40\)
2. \(\ldots + 4 = 50\)
3. \(\ldots + 1 = 100\)
4. \(15 + \ldots = 20\)
5. \(\ldots + 7 = 50\)
6. \(16 + \ldots = 20\)
7. \(52 + \ldots = 60\)
8. \(18 + \ldots = 20\)
9. \(53 + \ldots = 60\)
10. \(24 + \ldots = 30\)
11. \(\ldots + 3 = 90\)
12. \(99 + \ldots = 100\)

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Verbetersleutel

1. \(32 + 8 =40\)
2. \(46 + 4 =50\)
3. \(99 + 1 =100\)
4. \(15 + 5 = 20\)
5. \(43 + 7 =50\)
6. \(16 + 4 = 20\)
7. \(52 + 8 = 60\)
8. \(18 + 2 = 20\)
9. \(53 + 7 = 60\)
10. \(24 + 6 = 30\)
11. \(87 + 3 =90\)
12. \(99 + 1 = 100\)