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1. \(\ldots + 5 = 50\)
2. \(\ldots + 3 = 100\)
3. \(77 + \ldots = 80\)
4. \(\ldots + 4 = 80\)
5. \(88 + \ldots = 90\)
6. \(\ldots + 7 = 60\)
7. \(\ldots + 1 = 100\)
8. \(\ldots + 2 = 20\)
9. \(19 + \ldots = 20\)
10. \(36 + \ldots = 40\)
11. \(63 + \ldots = 70\)
12. \(52 + \ldots = 60\)

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Verbetersleutel

1. \(45 + 5 =50\)
2. \(97 + 3 =100\)
3. \(77 + 3 = 80\)
4. \(76 + 4 =80\)
5. \(88 + 2 = 90\)
6. \(53 + 7 =60\)
7. \(99 + 1 =100\)
8. \(18 + 2 =20\)
9. \(19 + 1 = 20\)
10. \(36 + 4 = 40\)
11. \(63 + 7 = 70\)
12. \(52 + 8 = 60\)