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1. \(64 + \ldots = 70\)
2. \(\ldots + 5 = 20\)
3. \(\ldots + 8 = 90\)
4. \(\ldots + 1 = 30\)
5. \(\ldots + 3 = 40\)
6. \(\ldots + 2 = 20\)
7. \(78 + \ldots = 80\)
8. \(89 + \ldots = 90\)
9. \(53 + \ldots = 60\)
10. \(67 + \ldots = 70\)
11. \(35 + \ldots = 40\)
12. \(\ldots + 4 = 30\)

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Verbetersleutel

1. \(64 + 6 = 70\)
2. \(15 + 5 =20\)
3. \(82 + 8 =90\)
4. \(29 + 1 =30\)
5. \(37 + 3 =40\)
6. \(18 + 2 =20\)
7. \(78 + 2 = 80\)
8. \(89 + 1 = 90\)
9. \(53 + 7 = 60\)
10. \(67 + 3 = 70\)
11. \(35 + 5 = 40\)
12. \(26 + 4 =30\)