Brug Mix (reeks 2)

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1. \(20 + 47 = \ldots\)
2. \(25 + 34 = \ldots\)
3. \(66 + 11 = \ldots\)
4. \(26 + 50 = \ldots\)
5. \(84 + 0 = \ldots\)
6. \(21 + 65 = \ldots\)
7. \(55 + 26 = \ldots\)
8. \(56 + 14 = \ldots\)
9. \(70 + 13 = \ldots\)
10. \(82 + 12 = \ldots\)
11. \(84 + 10 = \ldots\)
12. \(72 + 10 = \ldots\)

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Verbetersleutel

1. \(\begin{align} & 20 + 47\\= &20 + \color{green}{40} + \color{red}{7} \\= & \color{green}{60} + \color{red}{7} \\= & \color{red}{67} \end{align}\)
2. \(\begin{align} & 25 + 34\\= & \color{green}{20} + \color{red}{5} + \color{green}{30} + \color{red}{4} \\= & \color{green}{50} + \color{red}{9} \\= & \color{red}{59} \end{align}\)
3. \(\begin{align} & 66 + 11\\= & \color{green}{60} + \color{red}{6} + \color{green}{10} + \color{red}{1} \\= & \color{green}{70} + \color{red}{7} \\= & \color{red}{77} \end{align}\)
4. \(\begin{align} & 26 + 50\\= &50+26\\= &50 + \color{green}{20} + \color{red}{6} \\= & \color{green}{70} + \color{red}{6} \\= & \color{red}{76} \end{align}\)
5. \(\begin{align} & 84 + 0\\= &0+84\\= &0 + \color{green}{80} + \color{red}{4} \\= & \color{green}{80} + \color{red}{4} \\= & \color{red}{84} \end{align}\)
6. \(\begin{align} & 21 + 65\\= & \color{green}{20} + \color{red}{1} + \color{green}{60} + \color{red}{5} \\= & \color{green}{80} + \color{red}{6} \\= & \color{red}{86} \end{align}\)
7. \(\begin{align} & 55 + 26\\= & \color{green}{50} + \color{red}{5} + \color{green}{20} + \color{red}{6} \\= & \color{green}{70} + \color{red}{11} \\= & \color{green}{70} + \color{orange}{10} + \color{red}{1} \\= & \color{orange}{80} + \color{red}{1} \\= & \color{red}{81} \end{align}\)
8. \(\begin{align} & 56 + 14\\= & \color{green}{50} + \color{red}{6} + \color{green}{10} + \color{red}{4} \\= & \color{green}{60} + \color{red}{10} \\= & \color{red}{70} \end{align}\)
9. \(\begin{align} & 70 + 13\\= &70 + \color{green}{10} + \color{red}{3} \\= & \color{green}{80} + \color{red}{3} \\= & \color{red}{83} \end{align}\)
10. \(\begin{align} & 82 + 12\\= & \color{green}{80} + \color{red}{2} + \color{green}{10} + \color{red}{2} \\= & \color{green}{90} + \color{red}{4} \\= & \color{red}{94} \end{align}\)
11. \(\begin{align} & 84 + 10\\= &10+84\\= &10 + \color{green}{80} + \color{red}{4} \\= & \color{green}{90} + \color{red}{4} \\= & \color{red}{94} \end{align}\)
12. \(\begin{align} & 72 + 10\\= &10+72\\= &10 + \color{green}{70} + \color{red}{2} \\= & \color{green}{80} + \color{red}{2} \\= & \color{red}{82} \end{align}\)