Reken uit
- \(\ldots + 3 = 90\)
- \(25 + \ldots = 30\)
- \(88 + \ldots = 90\)
- \(94 + \ldots = 100\)
- \(\ldots + 6 = 90\)
- \(33 + \ldots = 40\)
- \(\ldots + 9 = 30\)
- \(31 + \ldots = 40\)
- \(\ldots + 5 = 50\)
- \(\ldots + 2 = 50\)
- \(72 + \ldots = 80\)
- \(47 + \ldots = 50\)
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Verbetersleutel
- \(87 + 3 =90\)
- \(25 + 5 = 30\)
- \(88 + 2 = 90\)
- \(94 + 6 = 100\)
- \(84 + 6 =90\)
- \(33 + 7 = 40\)
- \(21 + 9 =30\)
- \(31 + 9 = 40\)
- \(45 + 5 =50\)
- \(48 + 2 =50\)
- \(72 + 8 = 80\)
- \(47 + 3 = 50\)