Brug Mix (reeks 2)

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1. \(65 + 18 = \ldots\)
2. \(62 + 28 = \ldots\)
3. \(12 + 45 = \ldots\)
4. \(58 + 24 = \ldots\)
5. \(58 + 22 = \ldots\)
6. \(38 + 29 = \ldots\)
7. \(23 + 46 = \ldots\)
8. \(88 + 15 = \ldots\)
9. \(15 + 74 = \ldots\)
10. \(63 + 25 = \ldots\)
11. \(72 + 11 = \ldots\)
12. \(27 + 26 = \ldots\)

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Verbetersleutel

1. \(\begin{align} & 65 + 18\\= & \color{green}{60} + \color{red}{5} + \color{green}{10} + \color{red}{8} \\= & \color{green}{70} + \color{red}{13} \\= & \color{green}{70} + \color{orange}{10} + \color{red}{3} \\= & \color{orange}{80} + \color{red}{3} \\= & \color{red}{83} \end{align}\)
2. \(\begin{align} & 62 + 28\\= & \color{green}{60} + \color{red}{2} + \color{green}{20} + \color{red}{8} \\= & \color{green}{80} + \color{red}{10} \\= & \color{red}{90} \end{align}\)
3. \(\begin{align} & 12 + 45\\= & \color{green}{10} + \color{red}{2} + \color{green}{40} + \color{red}{5} \\= & \color{green}{50} + \color{red}{7} \\= & \color{red}{57} \end{align}\)
4. \(\begin{align} & 58 + 24\\= & \color{green}{50} + \color{red}{8} + \color{green}{20} + \color{red}{4} \\= & \color{green}{70} + \color{red}{12} \\= & \color{green}{70} + \color{orange}{10} + \color{red}{2} \\= & \color{orange}{80} + \color{red}{2} \\= & \color{red}{82} \end{align}\)
5. \(\begin{align} & 58 + 22\\= & \color{green}{50} + \color{red}{8} + \color{green}{20} + \color{red}{2} \\= & \color{green}{70} + \color{red}{10} \\= & \color{red}{80} \end{align}\)
6. \(\begin{align} & 38 + 29\\= & \color{green}{30} + \color{red}{8} + \color{green}{20} + \color{red}{9} \\= & \color{green}{50} + \color{red}{17} \\= & \color{green}{50} + \color{orange}{10} + \color{red}{7} \\= & \color{orange}{60} + \color{red}{7} \\= & \color{red}{67} \end{align}\)
7. \(\begin{align} & 23 + 46\\= & \color{green}{20} + \color{red}{3} + \color{green}{40} + \color{red}{6} \\= & \color{green}{60} + \color{red}{9} \\= & \color{red}{69} \end{align}\)
8. \(\begin{align} & 88 + 15\\= & \color{green}{80} + \color{red}{8} + \color{green}{10} + \color{red}{5} \\= & \color{green}{90} + \color{red}{13} \\= & \color{green}{90} + \color{orange}{10} + \color{red}{3} \\= & \color{orange}{100} + \color{red}{3} \\= & \color{red}{103} \end{align}\)
9. \(\begin{align} & 15 + 74\\= & \color{green}{10} + \color{red}{5} + \color{green}{70} + \color{red}{4} \\= & \color{green}{80} + \color{red}{9} \\= & \color{red}{89} \end{align}\)
10. \(\begin{align} & 63 + 25\\= & \color{green}{60} + \color{red}{3} + \color{green}{20} + \color{red}{5} \\= & \color{green}{80} + \color{red}{8} \\= & \color{red}{88} \end{align}\)
11. \(\begin{align} & 72 + 11\\= & \color{green}{70} + \color{red}{2} + \color{green}{10} + \color{red}{1} \\= & \color{green}{80} + \color{red}{3} \\= & \color{red}{83} \end{align}\)
12. \(\begin{align} & 27 + 26\\= & \color{green}{20} + \color{red}{7} + \color{green}{20} + \color{red}{6} \\= & \color{green}{40} + \color{red}{13} \\= & \color{green}{40} + \color{orange}{10} + \color{red}{3} \\= & \color{orange}{50} + \color{red}{3} \\= & \color{red}{53} \end{align}\)