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- \(9 + 7 = \)
- \(8 + 7 = \)
- \(3 + 8 = \)
- \(9 + 6 = \)
- \(6 + 6 = \)
- \(4 + 8 = \)
- \(5 + 7 = \)
- \(7 + 7 = \)
- \(3 + 9 = \)
- \(5 + 6 = \)
- \(6 + 7 = \)
- \(5 + 9 = \)
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Verbetersleutel
- \(\begin{align} & 9 + 7 \\= & 9 + \color{green}{1} + \color{red}{6} \\= & \color{green}{10} + \color{red}{6} \\= & \color{red}{16} \end{align}\)
- \(\begin{align} & 8 + 7 \\= & 8 + \color{green}{2} + \color{red}{5} \\= & \color{green}{10} + \color{red}{5} \\= & \color{red}{15} \end{align}\)
- \(\begin{align} & 3 + 8 \\= & 8 + 3 \\= & 8 + \color{green}{2} + \color{red}{1} \\= & \color{green}{10} + \color{red}{1} \\= & \color{red}{11} \end{align}\)
- \(\begin{align} & 9 + 6 \\= & 9 + \color{green}{1} + \color{red}{5} \\= & \color{green}{10} + \color{red}{5} \\= & \color{red}{15} \end{align}\)
- \(\begin{align} & 6 + 6 \\= & 6 + \color{green}{4} + \color{red}{2} \\= & \color{green}{10} + \color{red}{2} \\= & \color{red}{12} \end{align}\)
- \(\begin{align} & 4 + 8 \\= & 8 + 4 \\= & 8 + \color{green}{2} + \color{red}{2} \\= & \color{green}{10} + \color{red}{2} \\= & \color{red}{12} \end{align}\)
- \(\begin{align} & 5 + 7 \\= & 5 + \color{green}{5} + \color{red}{2} \\= & \color{green}{10} + \color{red}{2} \\= & \color{red}{12} \end{align}\)
- \(\begin{align} & 7 + 7 \\= & 7 + \color{green}{3} + \color{red}{4} \\= & \color{green}{10} + \color{red}{4} \\= & \color{red}{14} \end{align}\)
- \(\begin{align} & 3 + 9 \\= & 9 + 3 \\= & 9 + \color{green}{1} + \color{red}{2} \\= & \color{green}{10} + \color{red}{2} \\= & \color{red}{12} \end{align}\)
- \(\begin{align} & 5 + 6 \\= & 5 + \color{green}{5} + \color{red}{1} \\= & \color{green}{10} + \color{red}{1} \\= & \color{red}{11} \end{align}\)
- \(\begin{align} & 6 + 7 \\= & 6 + \color{green}{4} + \color{red}{3} \\= & \color{green}{10} + \color{red}{3} \\= & \color{red}{13} \end{align}\)
- \(\begin{align} & 5 + 9 \\= & 5 + \color{green}{5} + \color{red}{4} \\= & \color{green}{10} + \color{red}{4} \\= & \color{red}{14} \end{align}\)