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1. $$6 + 79 = \ldots$$
2. $$6 + 58 = \ldots$$
3. $$8 + 24 = \ldots$$
4. $$64 + 8 = \ldots$$
5. $$26 + 6 = \ldots$$
6. $$69 + 9 = \ldots$$
7. $$13 + 9 = \ldots$$
8. $$63 + 9 = \ldots$$
9. $$7 + 85 = \ldots$$
10. $$9 + 34 = \ldots$$
11. $$48 + 3 = \ldots$$
12. $$6 + 39 = \ldots$$

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Verbetersleutel

1. \begin{align} & 6 + 79 \\= & 79 + 6 \\= & 79 + \color{green}{1} + \color{red}{5} \\= & \color{green}{80} + \color{red}{5} \\= & \color{red}{85} \end{align}
2. \begin{align} & 6 + 58 \\= & 58 + 6 \\= & 58 + \color{green}{2} + \color{red}{4} \\= & \color{green}{60} + \color{red}{4} \\= & \color{red}{64} \end{align}
3. \begin{align} & 8 + 24 \\= & 24 + 8 \\= & 24 + \color{green}{6} + \color{red}{2} \\= & \color{green}{30} + \color{red}{2} \\= & \color{red}{32} \end{align}
4. \begin{align} & 64 + 8 \\= & 64 + \color{green}{6} + \color{red}{2} \\= & \color{green}{70} + \color{red}{2} \\= & \color{red}{72} \end{align}
5. \begin{align} & 26 + 6 \\= & 26 + \color{green}{4} + \color{red}{2} \\= & \color{green}{30} + \color{red}{2} \\= & \color{red}{32} \end{align}
6. \begin{align} & 69 + 9 \\= & 69 + \color{green}{1} + \color{red}{8} \\= & \color{green}{70} + \color{red}{8} \\= & \color{red}{78} \end{align}
7. \begin{align} & 13 + 9 \\= & 13 + \color{green}{7} + \color{red}{2} \\= & \color{green}{20} + \color{red}{2} \\= & \color{red}{22} \end{align}
8. \begin{align} & 63 + 9 \\= & 63 + \color{green}{7} + \color{red}{2} \\= & \color{green}{70} + \color{red}{2} \\= & \color{red}{72} \end{align}
9. \begin{align} & 7 + 85 \\= & 85 + 7 \\= & 85 + \color{green}{5} + \color{red}{2} \\= & \color{green}{90} + \color{red}{2} \\= & \color{red}{92} \end{align}
10. \begin{align} & 9 + 34 \\= & 34 + 9 \\= & 34 + \color{green}{6} + \color{red}{3} \\= & \color{green}{40} + \color{red}{3} \\= & \color{red}{43} \end{align}
11. \begin{align} & 48 + 3 \\= & 48 + \color{green}{2} + \color{red}{1} \\= & \color{green}{50} + \color{red}{1} \\= & \color{red}{51} \end{align}
12. \begin{align} & 6 + 39 \\= & 39 + 6 \\= & 39 + \color{green}{1} + \color{red}{5} \\= & \color{green}{40} + \color{red}{5} \\= & \color{red}{45} \end{align}
Oefeningengenerator vanhoeckes.be/wiskunde 2024-08-09 05:35:32