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1. \(\ldots + 4 = 20\)
2. \(\ldots + 5 = 100\)
3. \(55 + \ldots = 60\)
4. \(71 + \ldots = 80\)
5. \(\ldots + 9 = 50\)
6. \(\ldots + 3 = 60\)
7. \(99 + \ldots = 100\)
8. \(44 + \ldots = 50\)
9. \(26 + \ldots = 30\)
10. \(27 + \ldots = 30\)
11. \(\ldots + 8 = 40\)
12. \(\ldots + 7 = 70\)

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Verbetersleutel

1. \(16 + 4 =20\)
2. \(95 + 5 =100\)
3. \(55 + 5 = 60\)
4. \(71 + 9 = 80\)
5. \(41 + 9 =50\)
6. \(57 + 3 =60\)
7. \(99 + 1 = 100\)
8. \(44 + 6 = 50\)
9. \(26 + 4 = 30\)
10. \(27 + 3 = 30\)
11. \(32 + 8 =40\)
12. \(63 + 7 =70\)