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1. \(41 + 16 = \ldots\)
2. \(21 + 25 = \ldots\)
3. \(46 + 11 = \ldots\)
4. \(36 + 42 = \ldots\)
5. \(51 + 23 = \ldots\)
6. \(37 + 20 = \ldots\)
7. \(80 + 19 = \ldots\)
8. \(77 + 10 = \ldots\)
9. \(44 + 43 = \ldots\)
10. \(77 + 21 = \ldots\)
11. \(76 + 13 = \ldots\)
12. \(39 + 60 = \ldots\)

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Verbetersleutel

1. \(\begin{align} & 41 + 16\\= & \color{green}{40} + \color{red}{1} + \color{green}{10} + \color{red}{6} \\= & \color{green}{50} + \color{red}{7} \\= & \color{red}{57} \end{align}\)
2. \(\begin{align} & 21 + 25\\= & \color{green}{20} + \color{red}{1} + \color{green}{20} + \color{red}{5} \\= & \color{green}{40} + \color{red}{6} \\= & \color{red}{46} \end{align}\)
3. \(\begin{align} & 46 + 11\\= & \color{green}{40} + \color{red}{6} + \color{green}{10} + \color{red}{1} \\= & \color{green}{50} + \color{red}{7} \\= & \color{red}{57} \end{align}\)
4. \(\begin{align} & 36 + 42\\= & \color{green}{30} + \color{red}{6} + \color{green}{40} + \color{red}{2} \\= & \color{green}{70} + \color{red}{8} \\= & \color{red}{78} \end{align}\)
5. \(\begin{align} & 51 + 23\\= & \color{green}{50} + \color{red}{1} + \color{green}{20} + \color{red}{3} \\= & \color{green}{70} + \color{red}{4} \\= & \color{red}{74} \end{align}\)
6. \(\begin{align} & 37 + 20\\= &20+37\\= &20 + \color{green}{30} + \color{red}{7} \\= & \color{green}{50} + \color{red}{7} \\= & \color{red}{57} \end{align}\)
7. \(\begin{align} & 80 + 19\\= &80 + \color{green}{10} + \color{red}{9} \\= & \color{green}{90} + \color{red}{9} \\= & \color{red}{99} \end{align}\)
8. \(\begin{align} & 77 + 10\\= &10+77\\= &10 + \color{green}{70} + \color{red}{7} \\= & \color{green}{80} + \color{red}{7} \\= & \color{red}{87} \end{align}\)
9. \(\begin{align} & 44 + 43\\= & \color{green}{40} + \color{red}{4} + \color{green}{40} + \color{red}{3} \\= & \color{green}{80} + \color{red}{7} \\= & \color{red}{87} \end{align}\)
10. \(\begin{align} & 77 + 21\\= & \color{green}{70} + \color{red}{7} + \color{green}{20} + \color{red}{1} \\= & \color{green}{90} + \color{red}{8} \\= & \color{red}{98} \end{align}\)
11. \(\begin{align} & 76 + 13\\= & \color{green}{70} + \color{red}{6} + \color{green}{10} + \color{red}{3} \\= & \color{green}{80} + \color{red}{9} \\= & \color{red}{89} \end{align}\)
12. \(\begin{align} & 39 + 60\\= &60+39\\= &60 + \color{green}{30} + \color{red}{9} \\= & \color{green}{90} + \color{red}{9} \\= & \color{red}{99} \end{align}\)