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1. \(39 + 4 = \ldots\)
2. \(45 + 9 = \ldots\)
3. \(42 + 9 = \ldots\)
4. \(8 + 63 = \ldots\)
5. \(7 + 35 = \ldots\)
6. \(5 + 16 = \ldots\)
7. \(8 + 37 = \ldots\)
8. \(9 + 74 = \ldots\)
9. \(6 + 45 = \ldots\)
10. \(9 + 24 = \ldots\)
11. \(68 + 3 = \ldots\)
12. \(84 + 8 = \ldots\)

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Verbetersleutel

1. \(\begin{align} & 39 + 4 \\= & 39 + \color{green}{1} + \color{red}{3} \\= & \color{green}{40} + \color{red}{3} \\= & \color{red}{43} \end{align}\)
2. \(\begin{align} & 45 + 9 \\= & 45 + \color{green}{5} + \color{red}{4} \\= & \color{green}{50} + \color{red}{4} \\= & \color{red}{54} \end{align}\)
3. \(\begin{align} & 42 + 9 \\= & 42 + \color{green}{8} + \color{red}{1} \\= & \color{green}{50} + \color{red}{1} \\= & \color{red}{51} \end{align}\)
4. \(\begin{align} & 8 + 63 \\= & 63 + 8 \\= & 63 + \color{green}{7} + \color{red}{1} \\= & \color{green}{70} + \color{red}{1} \\= & \color{red}{71} \end{align}\)
5. \(\begin{align} & 7 + 35 \\= & 35 + 7 \\= & 35 + \color{green}{5} + \color{red}{2} \\= & \color{green}{40} + \color{red}{2} \\= & \color{red}{42} \end{align}\)
6. \(\begin{align} & 5 + 16 \\= & 16 + 5 \\= & 16 + \color{green}{4} + \color{red}{1} \\= & \color{green}{20} + \color{red}{1} \\= & \color{red}{21} \end{align}\)
7. \(\begin{align} & 8 + 37 \\= & 37 + 8 \\= & 37 + \color{green}{3} + \color{red}{5} \\= & \color{green}{40} + \color{red}{5} \\= & \color{red}{45} \end{align}\)
8. \(\begin{align} & 9 + 74 \\= & 74 + 9 \\= & 74 + \color{green}{6} + \color{red}{3} \\= & \color{green}{80} + \color{red}{3} \\= & \color{red}{83} \end{align}\)
9. \(\begin{align} & 6 + 45 \\= & 45 + 6 \\= & 45 + \color{green}{5} + \color{red}{1} \\= & \color{green}{50} + \color{red}{1} \\= & \color{red}{51} \end{align}\)
10. \(\begin{align} & 9 + 24 \\= & 24 + 9 \\= & 24 + \color{green}{6} + \color{red}{3} \\= & \color{green}{30} + \color{red}{3} \\= & \color{red}{33} \end{align}\)
11. \(\begin{align} & 68 + 3 \\= & 68 + \color{green}{2} + \color{red}{1} \\= & \color{green}{70} + \color{red}{1} \\= & \color{red}{71} \end{align}\)
12. \(\begin{align} & 84 + 8 \\= & 84 + \color{green}{6} + \color{red}{2} \\= & \color{green}{90} + \color{red}{2} \\= & \color{red}{92} \end{align}\)