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1. \(47 + 8 = \ldots\)
2. \(9 + 45 = \ldots\)
3. \(73 + 9 = \ldots\)
4. \(56 + 9 = \ldots\)
5. \(7 + 85 = \ldots\)
6. \(59 + 9 = \ldots\)
7. \(87 + 5 = \ldots\)
8. \(9 + 62 = \ldots\)
9. \(77 + 8 = \ldots\)
10. \(57 + 8 = \ldots\)
11. \(9 + 84 = \ldots\)
12. \(7 + 74 = \ldots\)

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Verbetersleutel

1. \(\begin{align} & 47 + 8 \\= & 47 + \color{green}{3} + \color{red}{5} \\= & \color{green}{50} + \color{red}{5} \\= & \color{red}{55} \end{align}\)
2. \(\begin{align} & 9 + 45 \\= & 45 + 9 \\= & 45 + \color{green}{5} + \color{red}{4} \\= & \color{green}{50} + \color{red}{4} \\= & \color{red}{54} \end{align}\)
3. \(\begin{align} & 73 + 9 \\= & 73 + \color{green}{7} + \color{red}{2} \\= & \color{green}{80} + \color{red}{2} \\= & \color{red}{82} \end{align}\)
4. \(\begin{align} & 56 + 9 \\= & 56 + \color{green}{4} + \color{red}{5} \\= & \color{green}{60} + \color{red}{5} \\= & \color{red}{65} \end{align}\)
5. \(\begin{align} & 7 + 85 \\= & 85 + 7 \\= & 85 + \color{green}{5} + \color{red}{2} \\= & \color{green}{90} + \color{red}{2} \\= & \color{red}{92} \end{align}\)
6. \(\begin{align} & 59 + 9 \\= & 59 + \color{green}{1} + \color{red}{8} \\= & \color{green}{60} + \color{red}{8} \\= & \color{red}{68} \end{align}\)
7. \(\begin{align} & 87 + 5 \\= & 87 + \color{green}{3} + \color{red}{2} \\= & \color{green}{90} + \color{red}{2} \\= & \color{red}{92} \end{align}\)
8. \(\begin{align} & 9 + 62 \\= & 62 + 9 \\= & 62 + \color{green}{8} + \color{red}{1} \\= & \color{green}{70} + \color{red}{1} \\= & \color{red}{71} \end{align}\)
9. \(\begin{align} & 77 + 8 \\= & 77 + \color{green}{3} + \color{red}{5} \\= & \color{green}{80} + \color{red}{5} \\= & \color{red}{85} \end{align}\)
10. \(\begin{align} & 57 + 8 \\= & 57 + \color{green}{3} + \color{red}{5} \\= & \color{green}{60} + \color{red}{5} \\= & \color{red}{65} \end{align}\)
11. \(\begin{align} & 9 + 84 \\= & 84 + 9 \\= & 84 + \color{green}{6} + \color{red}{3} \\= & \color{green}{90} + \color{red}{3} \\= & \color{red}{93} \end{align}\)
12. \(\begin{align} & 7 + 74 \\= & 74 + 7 \\= & 74 + \color{green}{6} + \color{red}{1} \\= & \color{green}{80} + \color{red}{1} \\= & \color{red}{81} \end{align}\)