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1. \(48 + 4 = \ldots\)
2. \(9 + 13 = \ldots\)
3. \(33 + 8 = \ldots\)
4. \(9 + 54 = \ldots\)
5. \(75 + 6 = \ldots\)
6. \(8 + 29 = \ldots\)
7. \(82 + 9 = \ldots\)
8. \(42 + 9 = \ldots\)
9. \(69 + 7 = \ldots\)
10. \(47 + 8 = \ldots\)
11. \(4 + 68 = \ldots\)
12. \(9 + 38 = \ldots\)

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Verbetersleutel

1. \(\begin{align} & 48 + 4 \\= & 48 + \color{green}{2} + \color{red}{2} \\= & \color{green}{50} + \color{red}{2} \\= & \color{red}{52} \end{align}\)
2. \(\begin{align} & 9 + 13 \\= & 13 + 9 \\= & 13 + \color{green}{7} + \color{red}{2} \\= & \color{green}{20} + \color{red}{2} \\= & \color{red}{22} \end{align}\)
3. \(\begin{align} & 33 + 8 \\= & 33 + \color{green}{7} + \color{red}{1} \\= & \color{green}{40} + \color{red}{1} \\= & \color{red}{41} \end{align}\)
4. \(\begin{align} & 9 + 54 \\= & 54 + 9 \\= & 54 + \color{green}{6} + \color{red}{3} \\= & \color{green}{60} + \color{red}{3} \\= & \color{red}{63} \end{align}\)
5. \(\begin{align} & 75 + 6 \\= & 75 + \color{green}{5} + \color{red}{1} \\= & \color{green}{80} + \color{red}{1} \\= & \color{red}{81} \end{align}\)
6. \(\begin{align} & 8 + 29 \\= & 29 + 8 \\= & 29 + \color{green}{1} + \color{red}{7} \\= & \color{green}{30} + \color{red}{7} \\= & \color{red}{37} \end{align}\)
7. \(\begin{align} & 82 + 9 \\= & 82 + \color{green}{8} + \color{red}{1} \\= & \color{green}{90} + \color{red}{1} \\= & \color{red}{91} \end{align}\)
8. \(\begin{align} & 42 + 9 \\= & 42 + \color{green}{8} + \color{red}{1} \\= & \color{green}{50} + \color{red}{1} \\= & \color{red}{51} \end{align}\)
9. \(\begin{align} & 69 + 7 \\= & 69 + \color{green}{1} + \color{red}{6} \\= & \color{green}{70} + \color{red}{6} \\= & \color{red}{76} \end{align}\)
10. \(\begin{align} & 47 + 8 \\= & 47 + \color{green}{3} + \color{red}{5} \\= & \color{green}{50} + \color{red}{5} \\= & \color{red}{55} \end{align}\)
11. \(\begin{align} & 4 + 68 \\= & 68 + 4 \\= & 68 + \color{green}{2} + \color{red}{2} \\= & \color{green}{70} + \color{red}{2} \\= & \color{red}{72} \end{align}\)
12. \(\begin{align} & 9 + 38 \\= & 38 + 9 \\= & 38 + \color{green}{2} + \color{red}{7} \\= & \color{green}{40} + \color{red}{7} \\= & \color{red}{47} \end{align}\)