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1. \(49 + 2 = \ldots\)
2. \(9 + 64 = \ldots\)
3. \(9 + 62 = \ldots\)
4. \(18 + 6 = \ldots\)
5. \(3 + 49 = \ldots\)
6. \(72 + 9 = \ldots\)
7. \(85 + 6 = \ldots\)
8. \(64 + 8 = \ldots\)
9. \(63 + 8 = \ldots\)
10. \(14 + 8 = \ldots\)
11. \(9 + 73 = \ldots\)
12. \(9 + 23 = \ldots\)

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Verbetersleutel

1. \(\begin{align} & 49 + 2 \\= & 49 + \color{green}{1} + \color{red}{1} \\= & \color{green}{50} + \color{red}{1} \\= & \color{red}{51} \end{align}\)
2. \(\begin{align} & 9 + 64 \\= & 64 + 9 \\= & 64 + \color{green}{6} + \color{red}{3} \\= & \color{green}{70} + \color{red}{3} \\= & \color{red}{73} \end{align}\)
3. \(\begin{align} & 9 + 62 \\= & 62 + 9 \\= & 62 + \color{green}{8} + \color{red}{1} \\= & \color{green}{70} + \color{red}{1} \\= & \color{red}{71} \end{align}\)
4. \(\begin{align} & 18 + 6 \\= & 18 + \color{green}{2} + \color{red}{4} \\= & \color{green}{20} + \color{red}{4} \\= & \color{red}{24} \end{align}\)
5. \(\begin{align} & 3 + 49 \\= & 49 + 3 \\= & 49 + \color{green}{1} + \color{red}{2} \\= & \color{green}{50} + \color{red}{2} \\= & \color{red}{52} \end{align}\)
6. \(\begin{align} & 72 + 9 \\= & 72 + \color{green}{8} + \color{red}{1} \\= & \color{green}{80} + \color{red}{1} \\= & \color{red}{81} \end{align}\)
7. \(\begin{align} & 85 + 6 \\= & 85 + \color{green}{5} + \color{red}{1} \\= & \color{green}{90} + \color{red}{1} \\= & \color{red}{91} \end{align}\)
8. \(\begin{align} & 64 + 8 \\= & 64 + \color{green}{6} + \color{red}{2} \\= & \color{green}{70} + \color{red}{2} \\= & \color{red}{72} \end{align}\)
9. \(\begin{align} & 63 + 8 \\= & 63 + \color{green}{7} + \color{red}{1} \\= & \color{green}{70} + \color{red}{1} \\= & \color{red}{71} \end{align}\)
10. \(\begin{align} & 14 + 8 \\= & 14 + \color{green}{6} + \color{red}{2} \\= & \color{green}{20} + \color{red}{2} \\= & \color{red}{22} \end{align}\)
11. \(\begin{align} & 9 + 73 \\= & 73 + 9 \\= & 73 + \color{green}{7} + \color{red}{2} \\= & \color{green}{80} + \color{red}{2} \\= & \color{red}{82} \end{align}\)
12. \(\begin{align} & 9 + 23 \\= & 23 + 9 \\= & 23 + \color{green}{7} + \color{red}{2} \\= & \color{green}{30} + \color{red}{2} \\= & \color{red}{32} \end{align}\)