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1. \(10 + 31 = \ldots\)
2. \(60 + 23 = \ldots\)
3. \(16 + 50 = \ldots\)
4. \(27 + 70 = \ldots\)
5. \(10 + 82 = \ldots\)
6. \(53 + 40 = \ldots\)
7. \(10 + 35 = \ldots\)
8. \(40 + 52 = \ldots\)
9. \(50 + 31 = \ldots\)
10. \(59 + 30 = \ldots\)
11. \(21 + 50 = \ldots\)
12. \(54 + 20 = \ldots\)

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Verbetersleutel

1. \(\begin{align} & 10 + 31 \\= & 10 + \color{green}{30} + \color{red}{1} \\ = & \color{green}{40} + \color{red}{1} \\ = & \color{red}{41} \end{align}\)
2. \(\begin{align} & 60 + 23 \\= & 60 + \color{green}{20} + \color{red}{3} \\ = & \color{green}{80} + \color{red}{3} \\ = & \color{red}{83} \end{align}\)
3. \(\begin{align} & 16 + 50 \\ = & 50 + 16 \\= & 50 + \color{green}{10} + \color{red}{6} \\ = & \color{green}{60} + \color{red}{6} \\ = & \color{red}{66} \end{align}\)
4. \(\begin{align} & 27 + 70 \\ = & 70 + 27 \\= & 70 + \color{green}{20} + \color{red}{7} \\ = & \color{green}{90} + \color{red}{7} \\ = & \color{red}{97} \end{align}\)
5. \(\begin{align} & 10 + 82 \\= & 10 + \color{green}{80} + \color{red}{2} \\ = & \color{green}{90} + \color{red}{2} \\ = & \color{red}{92} \end{align}\)
6. \(\begin{align} & 53 + 40 \\ = & 40 + 53 \\= & 40 + \color{green}{50} + \color{red}{3} \\ = & \color{green}{90} + \color{red}{3} \\ = & \color{red}{93} \end{align}\)
7. \(\begin{align} & 10 + 35 \\= & 10 + \color{green}{30} + \color{red}{5} \\ = & \color{green}{40} + \color{red}{5} \\ = & \color{red}{45} \end{align}\)
8. \(\begin{align} & 40 + 52 \\= & 40 + \color{green}{50} + \color{red}{2} \\ = & \color{green}{90} + \color{red}{2} \\ = & \color{red}{92} \end{align}\)
9. \(\begin{align} & 50 + 31 \\= & 50 + \color{green}{30} + \color{red}{1} \\ = & \color{green}{80} + \color{red}{1} \\ = & \color{red}{81} \end{align}\)
10. \(\begin{align} & 59 + 30 \\ = & 30 + 59 \\= & 30 + \color{green}{50} + \color{red}{9} \\ = & \color{green}{80} + \color{red}{9} \\ = & \color{red}{89} \end{align}\)
11. \(\begin{align} & 21 + 50 \\ = & 50 + 21 \\= & 50 + \color{green}{20} + \color{red}{1} \\ = & \color{green}{70} + \color{red}{1} \\ = & \color{red}{71} \end{align}\)
12. \(\begin{align} & 54 + 20 \\ = & 20 + 54 \\= & 20 + \color{green}{50} + \color{red}{4} \\ = & \color{green}{70} + \color{red}{4} \\ = & \color{red}{74} \end{align}\)