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1. \(57 + 20 = \ldots\)
2. \(14 + 34 = \ldots\)
3. \(49 + 40 = \ldots\)
4. \(50 + 20 = \ldots\)
5. \(45 + 50 = \ldots\)
6. \(62 + 10 = \ldots\)
7. \(22 + 51 = \ldots\)
8. \(88 + 11 = \ldots\)
9. \(32 + 62 = \ldots\)
10. \(58 + 20 = \ldots\)
11. \(25 + 40 = \ldots\)
12. \(38 + 10 = \ldots\)

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Verbetersleutel

1. \(\begin{align} & 57 + 20\\= &20+57\\= &20 + \color{green}{50} + \color{red}{7} \\= & \color{green}{70} + \color{red}{7} \\= & \color{red}{77} \end{align}\)
2. \(\begin{align} & 14 + 34\\= & \color{green}{10} + \color{red}{4} + \color{green}{30} + \color{red}{4} \\= & \color{green}{40} + \color{red}{8} \\= & \color{red}{48} \end{align}\)
3. \(\begin{align} & 49 + 40\\= &40+49\\= &40 + \color{green}{40} + \color{red}{9} \\= & \color{green}{80} + \color{red}{9} \\= & \color{red}{89} \end{align}\)
4. \(\begin{align} & 50 + 20\\= &50 + \color{green}{20} + \color{red}{0} \\= & \color{green}{70} + \color{red}{0} \\= & \color{red}{70} \end{align}\)
5. \(\begin{align} & 45 + 50\\= &50+45\\= &50 + \color{green}{40} + \color{red}{5} \\= & \color{green}{90} + \color{red}{5} \\= & \color{red}{95} \end{align}\)
6. \(\begin{align} & 62 + 10\\= &10+62\\= &10 + \color{green}{60} + \color{red}{2} \\= & \color{green}{70} + \color{red}{2} \\= & \color{red}{72} \end{align}\)
7. \(\begin{align} & 22 + 51\\= & \color{green}{20} + \color{red}{2} + \color{green}{50} + \color{red}{1} \\= & \color{green}{70} + \color{red}{3} \\= & \color{red}{73} \end{align}\)
8. \(\begin{align} & 88 + 11\\= & \color{green}{80} + \color{red}{8} + \color{green}{10} + \color{red}{1} \\= & \color{green}{90} + \color{red}{9} \\= & \color{red}{99} \end{align}\)
9. \(\begin{align} & 32 + 62\\= & \color{green}{30} + \color{red}{2} + \color{green}{60} + \color{red}{2} \\= & \color{green}{90} + \color{red}{4} \\= & \color{red}{94} \end{align}\)
10. \(\begin{align} & 58 + 20\\= &20+58\\= &20 + \color{green}{50} + \color{red}{8} \\= & \color{green}{70} + \color{red}{8} \\= & \color{red}{78} \end{align}\)
11. \(\begin{align} & 25 + 40\\= &40+25\\= &40 + \color{green}{20} + \color{red}{5} \\= & \color{green}{60} + \color{red}{5} \\= & \color{red}{65} \end{align}\)
12. \(\begin{align} & 38 + 10\\= &10+38\\= &10 + \color{green}{30} + \color{red}{8} \\= & \color{green}{40} + \color{red}{8} \\= & \color{red}{48} \end{align}\)