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1. \(30 + 39 = \ldots\)
2. \(75 + 14 = \ldots\)
3. \(38 + 30 = \ldots\)
4. \(72 + 17 = \ldots\)
5. \(48 + 11 = \ldots\)
6. \(83 + 16 = \ldots\)
7. \(57 + 30 = \ldots\)
8. \(25 + 10 = \ldots\)
9. \(18 + 51 = \ldots\)
10. \(60 + 29 = \ldots\)
11. \(71 + 11 = \ldots\)
12. \(33 + 13 = \ldots\)

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Verbetersleutel

1. \(\begin{align} & 30 + 39\\= &30 + \color{green}{30} + \color{red}{9} \\= & \color{green}{60} + \color{red}{9} \\= & \color{red}{69} \end{align}\)
2. \(\begin{align} & 75 + 14\\= & \color{green}{70} + \color{red}{5} + \color{green}{10} + \color{red}{4} \\= & \color{green}{80} + \color{red}{9} \\= & \color{red}{89} \end{align}\)
3. \(\begin{align} & 38 + 30\\= &30+38\\= &30 + \color{green}{30} + \color{red}{8} \\= & \color{green}{60} + \color{red}{8} \\= & \color{red}{68} \end{align}\)
4. \(\begin{align} & 72 + 17\\= & \color{green}{70} + \color{red}{2} + \color{green}{10} + \color{red}{7} \\= & \color{green}{80} + \color{red}{9} \\= & \color{red}{89} \end{align}\)
5. \(\begin{align} & 48 + 11\\= & \color{green}{40} + \color{red}{8} + \color{green}{10} + \color{red}{1} \\= & \color{green}{50} + \color{red}{9} \\= & \color{red}{59} \end{align}\)
6. \(\begin{align} & 83 + 16\\= & \color{green}{80} + \color{red}{3} + \color{green}{10} + \color{red}{6} \\= & \color{green}{90} + \color{red}{9} \\= & \color{red}{99} \end{align}\)
7. \(\begin{align} & 57 + 30\\= &30+57\\= &30 + \color{green}{50} + \color{red}{7} \\= & \color{green}{80} + \color{red}{7} \\= & \color{red}{87} \end{align}\)
8. \(\begin{align} & 25 + 10\\= &10+25\\= &10 + \color{green}{20} + \color{red}{5} \\= & \color{green}{30} + \color{red}{5} \\= & \color{red}{35} \end{align}\)
9. \(\begin{align} & 18 + 51\\= & \color{green}{10} + \color{red}{8} + \color{green}{50} + \color{red}{1} \\= & \color{green}{60} + \color{red}{9} \\= & \color{red}{69} \end{align}\)
10. \(\begin{align} & 60 + 29\\= &60 + \color{green}{20} + \color{red}{9} \\= & \color{green}{80} + \color{red}{9} \\= & \color{red}{89} \end{align}\)
11. \(\begin{align} & 71 + 11\\= & \color{green}{70} + \color{red}{1} + \color{green}{10} + \color{red}{1} \\= & \color{green}{80} + \color{red}{2} \\= & \color{red}{82} \end{align}\)
12. \(\begin{align} & 33 + 13\\= & \color{green}{30} + \color{red}{3} + \color{green}{10} + \color{red}{3} \\= & \color{green}{40} + \color{red}{6} \\= & \color{red}{46} \end{align}\)