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1. \(37 + 10 = \ldots\)
2. \(20 + 46 = \ldots\)
3. \(81 + 10 = \ldots\)
4. \(19 + 10 = \ldots\)
5. \(10 + 85 = \ldots\)
6. \(10 + 59 = \ldots\)
7. \(10 + 93 = \ldots\)
8. \(30 + 51 = \ldots\)
9. \(44 + 50 = \ldots\)
10. \(40 + 48 = \ldots\)
11. \(26 + 50 = \ldots\)
12. \(23 + 10 = \ldots\)

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Verbetersleutel

1. \(\begin{align} & 37 + 10 \\ = & 10 + 37 \\= & 10 + \color{green}{30} + \color{red}{7} \\ = & \color{green}{40} + \color{red}{7} \\ = & \color{red}{47} \end{align}\)
2. \(\begin{align} & 20 + 46 \\= & 20 + \color{green}{40} + \color{red}{6} \\ = & \color{green}{60} + \color{red}{6} \\ = & \color{red}{66} \end{align}\)
3. \(\begin{align} & 81 + 10 \\ = & 10 + 81 \\= & 10 + \color{green}{80} + \color{red}{1} \\ = & \color{green}{90} + \color{red}{1} \\ = & \color{red}{91} \end{align}\)
4. \(\begin{align} & 19 + 10 \\ = & 10 + 19 \\= & 10 + \color{green}{10} + \color{red}{9} \\ = & \color{green}{20} + \color{red}{9} \\ = & \color{red}{29} \end{align}\)
5. \(\begin{align} & 10 + 85 \\= & 10 + \color{green}{80} + \color{red}{5} \\ = & \color{green}{90} + \color{red}{5} \\ = & \color{red}{95} \end{align}\)
6. \(\begin{align} & 10 + 59 \\= & 10 + \color{green}{50} + \color{red}{9} \\ = & \color{green}{60} + \color{red}{9} \\ = & \color{red}{69} \end{align}\)
7. \(\begin{align} & 10 + 93 \\= & 10 + \color{green}{90} + \color{red}{3} \\ = & \color{green}{100} + \color{red}{3} \\ = & \color{red}{103} \end{align}\)
8. \(\begin{align} & 30 + 51 \\= & 30 + \color{green}{50} + \color{red}{1} \\ = & \color{green}{80} + \color{red}{1} \\ = & \color{red}{81} \end{align}\)
9. \(\begin{align} & 44 + 50 \\ = & 50 + 44 \\= & 50 + \color{green}{40} + \color{red}{4} \\ = & \color{green}{90} + \color{red}{4} \\ = & \color{red}{94} \end{align}\)
10. \(\begin{align} & 40 + 48 \\= & 40 + \color{green}{40} + \color{red}{8} \\ = & \color{green}{80} + \color{red}{8} \\ = & \color{red}{88} \end{align}\)
11. \(\begin{align} & 26 + 50 \\ = & 50 + 26 \\= & 50 + \color{green}{20} + \color{red}{6} \\ = & \color{green}{70} + \color{red}{6} \\ = & \color{red}{76} \end{align}\)
12. \(\begin{align} & 23 + 10 \\ = & 10 + 23 \\= & 10 + \color{green}{20} + \color{red}{3} \\ = & \color{green}{30} + \color{red}{3} \\ = & \color{red}{33} \end{align}\)