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1. \(\ldots + 8 = 70\)
2. \(\ldots + 6 = 40\)
3. \(36 + \ldots = 40\)
4. \(\ldots + 4 = 60\)
5. \(\ldots + 2 = 20\)
6. \(\ldots + 7 = 20\)
7. \(58 + \ldots = 60\)
8. \(\ldots + 3 = 80\)
9. \(79 + \ldots = 80\)
10. \(\ldots + 9 = 70\)
11. \(23 + \ldots = 30\)
12. \(35 + \ldots = 40\)

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Verbetersleutel

1. \(62 + 8 =70\)
2. \(34 + 6 =40\)
3. \(36 + 4 = 40\)
4. \(56 + 4 =60\)
5. \(18 + 2 =20\)
6. \(13 + 7 =20\)
7. \(58 + 2 = 60\)
8. \(77 + 3 =80\)
9. \(79 + 1 = 80\)
10. \(61 + 9 =70\)
11. \(23 + 7 = 30\)
12. \(35 + 5 = 40\)