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1. \(60 + 27 = \ldots\)
2. \(67 + 22 = \ldots\)
3. \(31 + 28 = \ldots\)
4. \(56 + 40 = \ldots\)
5. \(14 + 84 = \ldots\)
6. \(72 + 15 = \ldots\)
7. \(29 + 50 = \ldots\)
8. \(10 + 89 = \ldots\)
9. \(56 + 23 = \ldots\)
10. \(31 + 46 = \ldots\)
11. \(75 + 11 = \ldots\)
12. \(26 + 52 = \ldots\)

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Verbetersleutel

1. \(\begin{align} & 60 + 27\\= &60 + \color{green}{20} + \color{red}{7} \\= & \color{green}{80} + \color{red}{7} \\= & \color{red}{87} \end{align}\)
2. \(\begin{align} & 67 + 22\\= & \color{green}{60} + \color{red}{7} + \color{green}{20} + \color{red}{2} \\= & \color{green}{80} + \color{red}{9} \\= & \color{red}{89} \end{align}\)
3. \(\begin{align} & 31 + 28\\= & \color{green}{30} + \color{red}{1} + \color{green}{20} + \color{red}{8} \\= & \color{green}{50} + \color{red}{9} \\= & \color{red}{59} \end{align}\)
4. \(\begin{align} & 56 + 40\\= &40+56\\= &40 + \color{green}{50} + \color{red}{6} \\= & \color{green}{90} + \color{red}{6} \\= & \color{red}{96} \end{align}\)
5. \(\begin{align} & 14 + 84\\= & \color{green}{10} + \color{red}{4} + \color{green}{80} + \color{red}{4} \\= & \color{green}{90} + \color{red}{8} \\= & \color{red}{98} \end{align}\)
6. \(\begin{align} & 72 + 15\\= & \color{green}{70} + \color{red}{2} + \color{green}{10} + \color{red}{5} \\= & \color{green}{80} + \color{red}{7} \\= & \color{red}{87} \end{align}\)
7. \(\begin{align} & 29 + 50\\= &50+29\\= &50 + \color{green}{20} + \color{red}{9} \\= & \color{green}{70} + \color{red}{9} \\= & \color{red}{79} \end{align}\)
8. \(\begin{align} & 10 + 89\\= &10 + \color{green}{80} + \color{red}{9} \\= & \color{green}{90} + \color{red}{9} \\= & \color{red}{99} \end{align}\)
9. \(\begin{align} & 56 + 23\\= & \color{green}{50} + \color{red}{6} + \color{green}{20} + \color{red}{3} \\= & \color{green}{70} + \color{red}{9} \\= & \color{red}{79} \end{align}\)
10. \(\begin{align} & 31 + 46\\= & \color{green}{30} + \color{red}{1} + \color{green}{40} + \color{red}{6} \\= & \color{green}{70} + \color{red}{7} \\= & \color{red}{77} \end{align}\)
11. \(\begin{align} & 75 + 11\\= & \color{green}{70} + \color{red}{5} + \color{green}{10} + \color{red}{1} \\= & \color{green}{80} + \color{red}{6} \\= & \color{red}{86} \end{align}\)
12. \(\begin{align} & 26 + 52\\= & \color{green}{20} + \color{red}{6} + \color{green}{50} + \color{red}{2} \\= & \color{green}{70} + \color{red}{8} \\= & \color{red}{78} \end{align}\)