Brug Mix (reeks 2)

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1. \(39 + 27 = \ldots\)
2. \(63 + 25 = \ldots\)
3. \(22 + 67 = \ldots\)
4. \(32 + 41 = \ldots\)
5. \(68 + 10 = \ldots\)
6. \(58 + 32 = \ldots\)
7. \(10 + 57 = \ldots\)
8. \(62 + 23 = \ldots\)
9. \(45 + 28 = \ldots\)
10. \(54 + 29 = \ldots\)
11. \(20 + 39 = \ldots\)
12. \(62 + 18 = \ldots\)

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Verbetersleutel

1. \(\begin{align} & 39 + 27\\= & \color{green}{30} + \color{red}{9} + \color{green}{20} + \color{red}{7} \\= & \color{green}{50} + \color{red}{16} \\= & \color{green}{50} + \color{orange}{10} + \color{red}{6} \\= & \color{orange}{60} + \color{red}{6} \\= & \color{red}{66} \end{align}\)
2. \(\begin{align} & 63 + 25\\= & \color{green}{60} + \color{red}{3} + \color{green}{20} + \color{red}{5} \\= & \color{green}{80} + \color{red}{8} \\= & \color{red}{88} \end{align}\)
3. \(\begin{align} & 22 + 67\\= & \color{green}{20} + \color{red}{2} + \color{green}{60} + \color{red}{7} \\= & \color{green}{80} + \color{red}{9} \\= & \color{red}{89} \end{align}\)
4. \(\begin{align} & 32 + 41\\= & \color{green}{30} + \color{red}{2} + \color{green}{40} + \color{red}{1} \\= & \color{green}{70} + \color{red}{3} \\= & \color{red}{73} \end{align}\)
5. \(\begin{align} & 68 + 10\\= &10+68\\= &10 + \color{green}{60} + \color{red}{8} \\= & \color{green}{70} + \color{red}{8} \\= & \color{red}{78} \end{align}\)
6. \(\begin{align} & 58 + 32\\= & \color{green}{50} + \color{red}{8} + \color{green}{30} + \color{red}{2} \\= & \color{green}{80} + \color{red}{10} \\= & \color{red}{90} \end{align}\)
7. \(\begin{align} & 10 + 57\\= &10 + \color{green}{50} + \color{red}{7} \\= & \color{green}{60} + \color{red}{7} \\= & \color{red}{67} \end{align}\)
8. \(\begin{align} & 62 + 23\\= & \color{green}{60} + \color{red}{2} + \color{green}{20} + \color{red}{3} \\= & \color{green}{80} + \color{red}{5} \\= & \color{red}{85} \end{align}\)
9. \(\begin{align} & 45 + 28\\= & \color{green}{40} + \color{red}{5} + \color{green}{20} + \color{red}{8} \\= & \color{green}{60} + \color{red}{13} \\= & \color{green}{60} + \color{orange}{10} + \color{red}{3} \\= & \color{orange}{70} + \color{red}{3} \\= & \color{red}{73} \end{align}\)
10. \(\begin{align} & 54 + 29\\= & \color{green}{50} + \color{red}{4} + \color{green}{20} + \color{red}{9} \\= & \color{green}{70} + \color{red}{13} \\= & \color{green}{70} + \color{orange}{10} + \color{red}{3} \\= & \color{orange}{80} + \color{red}{3} \\= & \color{red}{83} \end{align}\)
11. \(\begin{align} & 20 + 39\\= &20 + \color{green}{30} + \color{red}{9} \\= & \color{green}{50} + \color{red}{9} \\= & \color{red}{59} \end{align}\)
12. \(\begin{align} & 62 + 18\\= & \color{green}{60} + \color{red}{2} + \color{green}{10} + \color{red}{8} \\= & \color{green}{70} + \color{red}{10} \\= & \color{red}{80} \end{align}\)