Reken uit
- \(45 + \ldots = 50\)
- \(88 + \ldots = 90\)
- \(\ldots + 4 = 30\)
- \(\ldots + 6 = 70\)
- \(\ldots + 7 = 30\)
- \(77 + \ldots = 80\)
- \(72 + \ldots = 80\)
- \(43 + \ldots = 50\)
- \(29 + \ldots = 30\)
- \(\ldots + 1 = 100\)
- \(51 + \ldots = 60\)
- \(86 + \ldots = 90\)
Reken uit
Verbetersleutel
- \(45 + 5 = 50\)
- \(88 + 2 = 90\)
- \(26 + 4 =30\)
- \(64 + 6 =70\)
- \(23 + 7 =30\)
- \(77 + 3 = 80\)
- \(72 + 8 = 80\)
- \(43 + 7 = 50\)
- \(29 + 1 = 30\)
- \(99 + 1 =100\)
- \(51 + 9 = 60\)
- \(86 + 4 = 90\)