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1. \(52 + 30 = \ldots\)
2. \(20 + 52 = \ldots\)
3. \(12 + 30 = \ldots\)
4. \(71 + 10 = \ldots\)
5. \(20 + 31 = \ldots\)
6. \(10 + 49 = \ldots\)
7. \(50 + 33 = \ldots\)
8. \(15 + 80 = \ldots\)
9. \(58 + 40 = \ldots\)
10. \(10 + 32 = \ldots\)
11. \(30 + 54 = \ldots\)
12. \(40 + 44 = \ldots\)

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Verbetersleutel

1. \(\begin{align} & 52 + 30 \\ = & 30 + 52 \\= & 30 + \color{green}{50} + \color{red}{2} \\ = & \color{green}{80} + \color{red}{2} \\ = & \color{red}{82} \end{align}\)
2. \(\begin{align} & 20 + 52 \\= & 20 + \color{green}{50} + \color{red}{2} \\ = & \color{green}{70} + \color{red}{2} \\ = & \color{red}{72} \end{align}\)
3. \(\begin{align} & 12 + 30 \\ = & 30 + 12 \\= & 30 + \color{green}{10} + \color{red}{2} \\ = & \color{green}{40} + \color{red}{2} \\ = & \color{red}{42} \end{align}\)
4. \(\begin{align} & 71 + 10 \\ = & 10 + 71 \\= & 10 + \color{green}{70} + \color{red}{1} \\ = & \color{green}{80} + \color{red}{1} \\ = & \color{red}{81} \end{align}\)
5. \(\begin{align} & 20 + 31 \\= & 20 + \color{green}{30} + \color{red}{1} \\ = & \color{green}{50} + \color{red}{1} \\ = & \color{red}{51} \end{align}\)
6. \(\begin{align} & 10 + 49 \\= & 10 + \color{green}{40} + \color{red}{9} \\ = & \color{green}{50} + \color{red}{9} \\ = & \color{red}{59} \end{align}\)
7. \(\begin{align} & 50 + 33 \\= & 50 + \color{green}{30} + \color{red}{3} \\ = & \color{green}{80} + \color{red}{3} \\ = & \color{red}{83} \end{align}\)
8. \(\begin{align} & 15 + 80 \\ = & 80 + 15 \\= & 80 + \color{green}{10} + \color{red}{5} \\ = & \color{green}{90} + \color{red}{5} \\ = & \color{red}{95} \end{align}\)
9. \(\begin{align} & 58 + 40 \\ = & 40 + 58 \\= & 40 + \color{green}{50} + \color{red}{8} \\ = & \color{green}{90} + \color{red}{8} \\ = & \color{red}{98} \end{align}\)
10. \(\begin{align} & 10 + 32 \\= & 10 + \color{green}{30} + \color{red}{2} \\ = & \color{green}{40} + \color{red}{2} \\ = & \color{red}{42} \end{align}\)
11. \(\begin{align} & 30 + 54 \\= & 30 + \color{green}{50} + \color{red}{4} \\ = & \color{green}{80} + \color{red}{4} \\ = & \color{red}{84} \end{align}\)
12. \(\begin{align} & 40 + 44 \\= & 40 + \color{green}{40} + \color{red}{4} \\ = & \color{green}{80} + \color{red}{4} \\ = & \color{red}{84} \end{align}\)