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1. \(37 + 4 = \ldots\)
2. \(53 + 8 = \ldots\)
3. \(3 + 78 = \ldots\)
4. \(8 + 39 = \ldots\)
5. \(78 + 5 = \ldots\)
6. \(8 + 58 = \ldots\)
7. \(6 + 35 = \ldots\)
8. \(7 + 44 = \ldots\)
9. \(9 + 72 = \ldots\)
10. \(7 + 19 = \ldots\)
11. \(65 + 9 = \ldots\)
12. \(39 + 4 = \ldots\)

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Verbetersleutel

1. \(\begin{align} & 37 + 4 \\= & 37 + \color{green}{3} + \color{red}{1} \\= & \color{green}{40} + \color{red}{1} \\= & \color{red}{41} \end{align}\)
2. \(\begin{align} & 53 + 8 \\= & 53 + \color{green}{7} + \color{red}{1} \\= & \color{green}{60} + \color{red}{1} \\= & \color{red}{61} \end{align}\)
3. \(\begin{align} & 3 + 78 \\= & 78 + 3 \\= & 78 + \color{green}{2} + \color{red}{1} \\= & \color{green}{80} + \color{red}{1} \\= & \color{red}{81} \end{align}\)
4. \(\begin{align} & 8 + 39 \\= & 39 + 8 \\= & 39 + \color{green}{1} + \color{red}{7} \\= & \color{green}{40} + \color{red}{7} \\= & \color{red}{47} \end{align}\)
5. \(\begin{align} & 78 + 5 \\= & 78 + \color{green}{2} + \color{red}{3} \\= & \color{green}{80} + \color{red}{3} \\= & \color{red}{83} \end{align}\)
6. \(\begin{align} & 8 + 58 \\= & 58 + 8 \\= & 58 + \color{green}{2} + \color{red}{6} \\= & \color{green}{60} + \color{red}{6} \\= & \color{red}{66} \end{align}\)
7. \(\begin{align} & 6 + 35 \\= & 35 + 6 \\= & 35 + \color{green}{5} + \color{red}{1} \\= & \color{green}{40} + \color{red}{1} \\= & \color{red}{41} \end{align}\)
8. \(\begin{align} & 7 + 44 \\= & 44 + 7 \\= & 44 + \color{green}{6} + \color{red}{1} \\= & \color{green}{50} + \color{red}{1} \\= & \color{red}{51} \end{align}\)
9. \(\begin{align} & 9 + 72 \\= & 72 + 9 \\= & 72 + \color{green}{8} + \color{red}{1} \\= & \color{green}{80} + \color{red}{1} \\= & \color{red}{81} \end{align}\)
10. \(\begin{align} & 7 + 19 \\= & 19 + 7 \\= & 19 + \color{green}{1} + \color{red}{6} \\= & \color{green}{20} + \color{red}{6} \\= & \color{red}{26} \end{align}\)
11. \(\begin{align} & 65 + 9 \\= & 65 + \color{green}{5} + \color{red}{4} \\= & \color{green}{70} + \color{red}{4} \\= & \color{red}{74} \end{align}\)
12. \(\begin{align} & 39 + 4 \\= & 39 + \color{green}{1} + \color{red}{3} \\= & \color{green}{40} + \color{red}{3} \\= & \color{red}{43} \end{align}\)