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1. \(\ldots + 8 = 20\)
2. \(\ldots + 7 = 40\)
3. \(\ldots + 5 = 30\)
4. \(\ldots + 3 = 30\)
5. \(87 + \ldots = 90\)
6. \(78 + \ldots = 80\)
7. \(62 + \ldots = 70\)
8. \(\ldots + 4 = 100\)
9. \(94 + \ldots = 100\)
10. \(\ldots + 1 = 20\)
11. \(81 + \ldots = 90\)
12. \(96 + \ldots = 100\)

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Verbetersleutel

1. \(12 + 8 =20\)
2. \(33 + 7 =40\)
3. \(25 + 5 =30\)
4. \(27 + 3 =30\)
5. \(87 + 3 = 90\)
6. \(78 + 2 = 80\)
7. \(62 + 8 = 70\)
8. \(96 + 4 =100\)
9. \(94 + 6 = 100\)
10. \(19 + 1 =20\)
11. \(81 + 9 = 90\)
12. \(96 + 4 = 100\)