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1. \(37 + 9 = \ldots\)
2. \(5 + 66 = \ldots\)
3. \(8 + 37 = \ldots\)
4. \(2 + 79 = \ldots\)
5. \(9 + 65 = \ldots\)
6. \(6 + 69 = \ldots\)
7. \(9 + 15 = \ldots\)
8. \(8 + 28 = \ldots\)
9. \(84 + 9 = \ldots\)
10. \(9 + 85 = \ldots\)
11. \(29 + 8 = \ldots\)
12. \(7 + 84 = \ldots\)

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Verbetersleutel

1. \(\begin{align} & 37 + 9 \\= & 37 + \color{green}{3} + \color{red}{6} \\= & \color{green}{40} + \color{red}{6} \\= & \color{red}{46} \end{align}\)
2. \(\begin{align} & 5 + 66 \\= & 66 + 5 \\= & 66 + \color{green}{4} + \color{red}{1} \\= & \color{green}{70} + \color{red}{1} \\= & \color{red}{71} \end{align}\)
3. \(\begin{align} & 8 + 37 \\= & 37 + 8 \\= & 37 + \color{green}{3} + \color{red}{5} \\= & \color{green}{40} + \color{red}{5} \\= & \color{red}{45} \end{align}\)
4. \(\begin{align} & 2 + 79 \\= & 79 + 2 \\= & 79 + \color{green}{1} + \color{red}{1} \\= & \color{green}{80} + \color{red}{1} \\= & \color{red}{81} \end{align}\)
5. \(\begin{align} & 9 + 65 \\= & 65 + 9 \\= & 65 + \color{green}{5} + \color{red}{4} \\= & \color{green}{70} + \color{red}{4} \\= & \color{red}{74} \end{align}\)
6. \(\begin{align} & 6 + 69 \\= & 69 + 6 \\= & 69 + \color{green}{1} + \color{red}{5} \\= & \color{green}{70} + \color{red}{5} \\= & \color{red}{75} \end{align}\)
7. \(\begin{align} & 9 + 15 \\= & 15 + 9 \\= & 15 + \color{green}{5} + \color{red}{4} \\= & \color{green}{20} + \color{red}{4} \\= & \color{red}{24} \end{align}\)
8. \(\begin{align} & 8 + 28 \\= & 28 + 8 \\= & 28 + \color{green}{2} + \color{red}{6} \\= & \color{green}{30} + \color{red}{6} \\= & \color{red}{36} \end{align}\)
9. \(\begin{align} & 84 + 9 \\= & 84 + \color{green}{6} + \color{red}{3} \\= & \color{green}{90} + \color{red}{3} \\= & \color{red}{93} \end{align}\)
10. \(\begin{align} & 9 + 85 \\= & 85 + 9 \\= & 85 + \color{green}{5} + \color{red}{4} \\= & \color{green}{90} + \color{red}{4} \\= & \color{red}{94} \end{align}\)
11. \(\begin{align} & 29 + 8 \\= & 29 + \color{green}{1} + \color{red}{7} \\= & \color{green}{30} + \color{red}{7} \\= & \color{red}{37} \end{align}\)
12. \(\begin{align} & 7 + 84 \\= & 84 + 7 \\= & 84 + \color{green}{6} + \color{red}{1} \\= & \color{green}{90} + \color{red}{1} \\= & \color{red}{91} \end{align}\)