Brug Mix (reeks 2)

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1. \(55 + 14 = \ldots\)
2. \(73 + 10 = \ldots\)
3. \(19 + 11 = \ldots\)
4. \(22 + 18 = \ldots\)
5. \(11 + 69 = \ldots\)
6. \(54 + 39 = \ldots\)
7. \(85 + 12 = \ldots\)
8. \(34 + 37 = \ldots\)
9. \(52 + 32 = \ldots\)
10. \(12 + 16 = \ldots\)
11. \(37 + 44 = \ldots\)
12. \(30 + 15 = \ldots\)

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Verbetersleutel

1. \(\begin{align} & 55 + 14\\= & \color{green}{50} + \color{red}{5} + \color{green}{10} + \color{red}{4} \\= & \color{green}{60} + \color{red}{9} \\= & \color{red}{69} \end{align}\)
2. \(\begin{align} & 73 + 10\\= &10+73\\= &10 + \color{green}{70} + \color{red}{3} \\= & \color{green}{80} + \color{red}{3} \\= & \color{red}{83} \end{align}\)
3. \(\begin{align} & 19 + 11\\= & \color{green}{10} + \color{red}{9} + \color{green}{10} + \color{red}{1} \\= & \color{green}{20} + \color{red}{10} \\= & \color{red}{30} \end{align}\)
4. \(\begin{align} & 22 + 18\\= & \color{green}{20} + \color{red}{2} + \color{green}{10} + \color{red}{8} \\= & \color{green}{30} + \color{red}{10} \\= & \color{red}{40} \end{align}\)
5. \(\begin{align} & 11 + 69\\= & \color{green}{10} + \color{red}{1} + \color{green}{60} + \color{red}{9} \\= & \color{green}{70} + \color{red}{10} \\= & \color{red}{80} \end{align}\)
6. \(\begin{align} & 54 + 39\\= & \color{green}{50} + \color{red}{4} + \color{green}{30} + \color{red}{9} \\= & \color{green}{80} + \color{red}{13} \\= & \color{green}{80} + \color{orange}{10} + \color{red}{3} \\= & \color{orange}{90} + \color{red}{3} \\= & \color{red}{93} \end{align}\)
7. \(\begin{align} & 85 + 12\\= & \color{green}{80} + \color{red}{5} + \color{green}{10} + \color{red}{2} \\= & \color{green}{90} + \color{red}{7} \\= & \color{red}{97} \end{align}\)
8. \(\begin{align} & 34 + 37\\= & \color{green}{30} + \color{red}{4} + \color{green}{30} + \color{red}{7} \\= & \color{green}{60} + \color{red}{11} \\= & \color{green}{60} + \color{orange}{10} + \color{red}{1} \\= & \color{orange}{70} + \color{red}{1} \\= & \color{red}{71} \end{align}\)
9. \(\begin{align} & 52 + 32\\= & \color{green}{50} + \color{red}{2} + \color{green}{30} + \color{red}{2} \\= & \color{green}{80} + \color{red}{4} \\= & \color{red}{84} \end{align}\)
10. \(\begin{align} & 12 + 16\\= & \color{green}{10} + \color{red}{2} + \color{green}{10} + \color{red}{6} \\= & \color{green}{20} + \color{red}{8} \\= & \color{red}{28} \end{align}\)
11. \(\begin{align} & 37 + 44\\= & \color{green}{30} + \color{red}{7} + \color{green}{40} + \color{red}{4} \\= & \color{green}{70} + \color{red}{11} \\= & \color{green}{70} + \color{orange}{10} + \color{red}{1} \\= & \color{orange}{80} + \color{red}{1} \\= & \color{red}{81} \end{align}\)
12. \(\begin{align} & 30 + 15\\= &30 + \color{green}{10} + \color{red}{5} \\= & \color{green}{40} + \color{red}{5} \\= & \color{red}{45} \end{align}\)