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1. \(\ldots + 8 = 20\)
2. \(57 + \ldots = 60\)
3. \(\ldots + 1 = 20\)
4. \(\ldots + 3 = 60\)
5. \(\ldots + 9 = 70\)
6. \(\ldots + 2 = 100\)
7. \(23 + \ldots = 30\)
8. \(92 + \ldots = 100\)
9. \(38 + \ldots = 40\)
10. \(\ldots + 7 = 20\)
11. \(\ldots + 4 = 30\)
12. \(\ldots + 6 = 90\)

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Verbetersleutel

1. \(12 + 8 =20\)
2. \(57 + 3 = 60\)
3. \(19 + 1 =20\)
4. \(57 + 3 =60\)
5. \(61 + 9 =70\)
6. \(98 + 2 =100\)
7. \(23 + 7 = 30\)
8. \(92 + 8 = 100\)
9. \(38 + 2 = 40\)
10. \(13 + 7 =20\)
11. \(26 + 4 =30\)
12. \(84 + 6 =90\)