Reken uit
- \(\ldots + 6 = 50\)
- \(\ldots + 7 = 30\)
- \(21 + \ldots = 30\)
- \(28 + \ldots = 30\)
- \(39 + \ldots = 40\)
- \(95 + \ldots = 100\)
- \(\ldots + 5 = 50\)
- \(\ldots + 3 = 40\)
- \(\ldots + 9 = 60\)
- \(93 + \ldots = 100\)
- \(47 + \ldots = 50\)
- \(84 + \ldots = 90\)
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Verbetersleutel
- \(44 + 6 =50\)
- \(23 + 7 =30\)
- \(21 + 9 = 30\)
- \(28 + 2 = 30\)
- \(39 + 1 = 40\)
- \(95 + 5 = 100\)
- \(45 + 5 =50\)
- \(37 + 3 =40\)
- \(51 + 9 =60\)
- \(93 + 7 = 100\)
- \(47 + 3 = 50\)
- \(84 + 6 = 90\)