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1. \(20 + 44 = \ldots\)
2. \(70 + 15 = \ldots\)
3. \(61 + 10 = \ldots\)
4. \(57 + 40 = \ldots\)
5. \(17 + 50 = \ldots\)
6. \(30 + 59 = \ldots\)
7. \(50 + 31 = \ldots\)
8. \(57 + 30 = \ldots\)
9. \(50 + 44 = \ldots\)
10. \(33 + 50 = \ldots\)
11. \(50 + 13 = \ldots\)
12. \(59 + 10 = \ldots\)

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Verbetersleutel

1. \(\begin{align} & 20 + 44 \\= & 20 + \color{green}{40} + \color{red}{4} \\ = & \color{green}{60} + \color{red}{4} \\ = & \color{red}{64} \end{align}\)
2. \(\begin{align} & 70 + 15 \\= & 70 + \color{green}{10} + \color{red}{5} \\ = & \color{green}{80} + \color{red}{5} \\ = & \color{red}{85} \end{align}\)
3. \(\begin{align} & 61 + 10 \\ = & 10 + 61 \\= & 10 + \color{green}{60} + \color{red}{1} \\ = & \color{green}{70} + \color{red}{1} \\ = & \color{red}{71} \end{align}\)
4. \(\begin{align} & 57 + 40 \\ = & 40 + 57 \\= & 40 + \color{green}{50} + \color{red}{7} \\ = & \color{green}{90} + \color{red}{7} \\ = & \color{red}{97} \end{align}\)
5. \(\begin{align} & 17 + 50 \\ = & 50 + 17 \\= & 50 + \color{green}{10} + \color{red}{7} \\ = & \color{green}{60} + \color{red}{7} \\ = & \color{red}{67} \end{align}\)
6. \(\begin{align} & 30 + 59 \\= & 30 + \color{green}{50} + \color{red}{9} \\ = & \color{green}{80} + \color{red}{9} \\ = & \color{red}{89} \end{align}\)
7. \(\begin{align} & 50 + 31 \\= & 50 + \color{green}{30} + \color{red}{1} \\ = & \color{green}{80} + \color{red}{1} \\ = & \color{red}{81} \end{align}\)
8. \(\begin{align} & 57 + 30 \\ = & 30 + 57 \\= & 30 + \color{green}{50} + \color{red}{7} \\ = & \color{green}{80} + \color{red}{7} \\ = & \color{red}{87} \end{align}\)
9. \(\begin{align} & 50 + 44 \\= & 50 + \color{green}{40} + \color{red}{4} \\ = & \color{green}{90} + \color{red}{4} \\ = & \color{red}{94} \end{align}\)
10. \(\begin{align} & 33 + 50 \\ = & 50 + 33 \\= & 50 + \color{green}{30} + \color{red}{3} \\ = & \color{green}{80} + \color{red}{3} \\ = & \color{red}{83} \end{align}\)
11. \(\begin{align} & 50 + 13 \\= & 50 + \color{green}{10} + \color{red}{3} \\ = & \color{green}{60} + \color{red}{3} \\ = & \color{red}{63} \end{align}\)
12. \(\begin{align} & 59 + 10 \\ = & 10 + 59 \\= & 10 + \color{green}{50} + \color{red}{9} \\ = & \color{green}{60} + \color{red}{9} \\ = & \color{red}{69} \end{align}\)