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1. \(15 + 9 = \ldots\)
2. \(16 + 8 = \ldots\)
3. \(62 + 9 = \ldots\)
4. \(4 + 47 = \ldots\)
5. \(18 + 3 = \ldots\)
6. \(32 + 9 = \ldots\)
7. \(46 + 7 = \ldots\)
8. \(74 + 9 = \ldots\)
9. \(79 + 4 = \ldots\)
10. \(8 + 38 = \ldots\)
11. \(66 + 9 = \ldots\)
12. \(8 + 78 = \ldots\)

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Verbetersleutel

1. \(\begin{align} & 15 + 9 \\= & 15 + \color{green}{5} + \color{red}{4} \\= & \color{green}{20} + \color{red}{4} \\= & \color{red}{24} \end{align}\)
2. \(\begin{align} & 16 + 8 \\= & 16 + \color{green}{4} + \color{red}{4} \\= & \color{green}{20} + \color{red}{4} \\= & \color{red}{24} \end{align}\)
3. \(\begin{align} & 62 + 9 \\= & 62 + \color{green}{8} + \color{red}{1} \\= & \color{green}{70} + \color{red}{1} \\= & \color{red}{71} \end{align}\)
4. \(\begin{align} & 4 + 47 \\= & 47 + 4 \\= & 47 + \color{green}{3} + \color{red}{1} \\= & \color{green}{50} + \color{red}{1} \\= & \color{red}{51} \end{align}\)
5. \(\begin{align} & 18 + 3 \\= & 18 + \color{green}{2} + \color{red}{1} \\= & \color{green}{20} + \color{red}{1} \\= & \color{red}{21} \end{align}\)
6. \(\begin{align} & 32 + 9 \\= & 32 + \color{green}{8} + \color{red}{1} \\= & \color{green}{40} + \color{red}{1} \\= & \color{red}{41} \end{align}\)
7. \(\begin{align} & 46 + 7 \\= & 46 + \color{green}{4} + \color{red}{3} \\= & \color{green}{50} + \color{red}{3} \\= & \color{red}{53} \end{align}\)
8. \(\begin{align} & 74 + 9 \\= & 74 + \color{green}{6} + \color{red}{3} \\= & \color{green}{80} + \color{red}{3} \\= & \color{red}{83} \end{align}\)
9. \(\begin{align} & 79 + 4 \\= & 79 + \color{green}{1} + \color{red}{3} \\= & \color{green}{80} + \color{red}{3} \\= & \color{red}{83} \end{align}\)
10. \(\begin{align} & 8 + 38 \\= & 38 + 8 \\= & 38 + \color{green}{2} + \color{red}{6} \\= & \color{green}{40} + \color{red}{6} \\= & \color{red}{46} \end{align}\)
11. \(\begin{align} & 66 + 9 \\= & 66 + \color{green}{4} + \color{red}{5} \\= & \color{green}{70} + \color{red}{5} \\= & \color{red}{75} \end{align}\)
12. \(\begin{align} & 8 + 78 \\= & 78 + 8 \\= & 78 + \color{green}{2} + \color{red}{6} \\= & \color{green}{80} + \color{red}{6} \\= & \color{red}{86} \end{align}\)