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1. \(\ldots + 8 = 70\)
2. \(49 + \ldots = 50\)
3. \(61 + \ldots = 70\)
4. \(\ldots + 5 = 40\)
5. \(\ldots + 2 = 70\)
6. \(73 + \ldots = 80\)
7. \(\ldots + 4 = 90\)
8. \(\ldots + 6 = 40\)
9. \(\ldots + 7 = 60\)
10. \(\ldots + 3 = 100\)
11. \(42 + \ldots = 50\)
12. \(46 + \ldots = 50\)

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Verbetersleutel

1. \(62 + 8 =70\)
2. \(49 + 1 = 50\)
3. \(61 + 9 = 70\)
4. \(35 + 5 =40\)
5. \(68 + 2 =70\)
6. \(73 + 7 = 80\)
7. \(86 + 4 =90\)
8. \(34 + 6 =40\)
9. \(53 + 7 =60\)
10. \(97 + 3 =100\)
11. \(42 + 8 = 50\)
12. \(46 + 4 = 50\)