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1. \(42 + 9 = \ldots\)
2. \(8 + 23 = \ldots\)
3. \(4 + 69 = \ldots\)
4. \(25 + 7 = \ldots\)
5. \(8 + 74 = \ldots\)
6. \(9 + 12 = \ldots\)
7. \(17 + 9 = \ldots\)
8. \(38 + 7 = \ldots\)
9. \(24 + 7 = \ldots\)
10. \(37 + 9 = \ldots\)
11. \(6 + 68 = \ldots\)
12. \(16 + 5 = \ldots\)

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Verbetersleutel

1. \(\begin{align} & 42 + 9 \\= & 42 + \color{green}{8} + \color{red}{1} \\= & \color{green}{50} + \color{red}{1} \\= & \color{red}{51} \end{align}\)
2. \(\begin{align} & 8 + 23 \\= & 23 + 8 \\= & 23 + \color{green}{7} + \color{red}{1} \\= & \color{green}{30} + \color{red}{1} \\= & \color{red}{31} \end{align}\)
3. \(\begin{align} & 4 + 69 \\= & 69 + 4 \\= & 69 + \color{green}{1} + \color{red}{3} \\= & \color{green}{70} + \color{red}{3} \\= & \color{red}{73} \end{align}\)
4. \(\begin{align} & 25 + 7 \\= & 25 + \color{green}{5} + \color{red}{2} \\= & \color{green}{30} + \color{red}{2} \\= & \color{red}{32} \end{align}\)
5. \(\begin{align} & 8 + 74 \\= & 74 + 8 \\= & 74 + \color{green}{6} + \color{red}{2} \\= & \color{green}{80} + \color{red}{2} \\= & \color{red}{82} \end{align}\)
6. \(\begin{align} & 9 + 12 \\= & 12 + 9 \\= & 12 + \color{green}{8} + \color{red}{1} \\= & \color{green}{20} + \color{red}{1} \\= & \color{red}{21} \end{align}\)
7. \(\begin{align} & 17 + 9 \\= & 17 + \color{green}{3} + \color{red}{6} \\= & \color{green}{20} + \color{red}{6} \\= & \color{red}{26} \end{align}\)
8. \(\begin{align} & 38 + 7 \\= & 38 + \color{green}{2} + \color{red}{5} \\= & \color{green}{40} + \color{red}{5} \\= & \color{red}{45} \end{align}\)
9. \(\begin{align} & 24 + 7 \\= & 24 + \color{green}{6} + \color{red}{1} \\= & \color{green}{30} + \color{red}{1} \\= & \color{red}{31} \end{align}\)
10. \(\begin{align} & 37 + 9 \\= & 37 + \color{green}{3} + \color{red}{6} \\= & \color{green}{40} + \color{red}{6} \\= & \color{red}{46} \end{align}\)
11. \(\begin{align} & 6 + 68 \\= & 68 + 6 \\= & 68 + \color{green}{2} + \color{red}{4} \\= & \color{green}{70} + \color{red}{4} \\= & \color{red}{74} \end{align}\)
12. \(\begin{align} & 16 + 5 \\= & 16 + \color{green}{4} + \color{red}{1} \\= & \color{green}{20} + \color{red}{1} \\= & \color{red}{21} \end{align}\)