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1. \(61 + \ldots = 70\)
2. \(16 + \ldots = 20\)
3. \(27 + \ldots = 30\)
4. \(\ldots + 9 = 60\)
5. \(28 + \ldots = 30\)
6. \(\ldots + 2 = 50\)
7. \(\ldots + 7 = 20\)
8. \(52 + \ldots = 60\)
9. \(44 + \ldots = 50\)
10. \(\ldots + 8 = 30\)
11. \(\ldots + 6 = 80\)
12. \(\ldots + 4 = 40\)

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Verbetersleutel

1. \(61 + 9 = 70\)
2. \(16 + 4 = 20\)
3. \(27 + 3 = 30\)
4. \(51 + 9 =60\)
5. \(28 + 2 = 30\)
6. \(48 + 2 =50\)
7. \(13 + 7 =20\)
8. \(52 + 8 = 60\)
9. \(44 + 6 = 50\)
10. \(22 + 8 =30\)
11. \(74 + 6 =80\)
12. \(36 + 4 =40\)