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1. \(3 + 49 = \ldots\)
2. \(53 + 8 = \ldots\)
3. \(9 + 23 = \ldots\)
4. \(62 + 9 = \ldots\)
5. \(84 + 8 = \ldots\)
6. \(9 + 22 = \ldots\)
7. \(9 + 64 = \ldots\)
8. \(66 + 8 = \ldots\)
9. \(73 + 8 = \ldots\)
10. \(83 + 9 = \ldots\)
11. \(5 + 67 = \ldots\)
12. \(14 + 7 = \ldots\)

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Verbetersleutel

1. \(\begin{align} & 3 + 49 \\= & 49 + 3 \\= & 49 + \color{green}{1} + \color{red}{2} \\= & \color{green}{50} + \color{red}{2} \\= & \color{red}{52} \end{align}\)
2. \(\begin{align} & 53 + 8 \\= & 53 + \color{green}{7} + \color{red}{1} \\= & \color{green}{60} + \color{red}{1} \\= & \color{red}{61} \end{align}\)
3. \(\begin{align} & 9 + 23 \\= & 23 + 9 \\= & 23 + \color{green}{7} + \color{red}{2} \\= & \color{green}{30} + \color{red}{2} \\= & \color{red}{32} \end{align}\)
4. \(\begin{align} & 62 + 9 \\= & 62 + \color{green}{8} + \color{red}{1} \\= & \color{green}{70} + \color{red}{1} \\= & \color{red}{71} \end{align}\)
5. \(\begin{align} & 84 + 8 \\= & 84 + \color{green}{6} + \color{red}{2} \\= & \color{green}{90} + \color{red}{2} \\= & \color{red}{92} \end{align}\)
6. \(\begin{align} & 9 + 22 \\= & 22 + 9 \\= & 22 + \color{green}{8} + \color{red}{1} \\= & \color{green}{30} + \color{red}{1} \\= & \color{red}{31} \end{align}\)
7. \(\begin{align} & 9 + 64 \\= & 64 + 9 \\= & 64 + \color{green}{6} + \color{red}{3} \\= & \color{green}{70} + \color{red}{3} \\= & \color{red}{73} \end{align}\)
8. \(\begin{align} & 66 + 8 \\= & 66 + \color{green}{4} + \color{red}{4} \\= & \color{green}{70} + \color{red}{4} \\= & \color{red}{74} \end{align}\)
9. \(\begin{align} & 73 + 8 \\= & 73 + \color{green}{7} + \color{red}{1} \\= & \color{green}{80} + \color{red}{1} \\= & \color{red}{81} \end{align}\)
10. \(\begin{align} & 83 + 9 \\= & 83 + \color{green}{7} + \color{red}{2} \\= & \color{green}{90} + \color{red}{2} \\= & \color{red}{92} \end{align}\)
11. \(\begin{align} & 5 + 67 \\= & 67 + 5 \\= & 67 + \color{green}{3} + \color{red}{2} \\= & \color{green}{70} + \color{red}{2} \\= & \color{red}{72} \end{align}\)
12. \(\begin{align} & 14 + 7 \\= & 14 + \color{green}{6} + \color{red}{1} \\= & \color{green}{20} + \color{red}{1} \\= & \color{red}{21} \end{align}\)