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1. \(53 + 20 = \ldots\)
2. \(20 + 61 = \ldots\)
3. \(58 + 10 = \ldots\)
4. \(15 + 10 = \ldots\)
5. \(20 + 41 = \ldots\)
6. \(22 + 50 = \ldots\)
7. \(40 + 52 = \ldots\)
8. \(36 + 10 = \ldots\)
9. \(14 + 80 = \ldots\)
10. \(20 + 68 = \ldots\)
11. \(30 + 14 = \ldots\)
12. \(56 + 40 = \ldots\)

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Verbetersleutel

1. \(\begin{align} & 53 + 20 \\ = & 20 + 53 \\= & 20 + \color{green}{50} + \color{red}{3} \\ = & \color{green}{70} + \color{red}{3} \\ = & \color{red}{73} \end{align}\)
2. \(\begin{align} & 20 + 61 \\= & 20 + \color{green}{60} + \color{red}{1} \\ = & \color{green}{80} + \color{red}{1} \\ = & \color{red}{81} \end{align}\)
3. \(\begin{align} & 58 + 10 \\ = & 10 + 58 \\= & 10 + \color{green}{50} + \color{red}{8} \\ = & \color{green}{60} + \color{red}{8} \\ = & \color{red}{68} \end{align}\)
4. \(\begin{align} & 15 + 10 \\ = & 10 + 15 \\= & 10 + \color{green}{10} + \color{red}{5} \\ = & \color{green}{20} + \color{red}{5} \\ = & \color{red}{25} \end{align}\)
5. \(\begin{align} & 20 + 41 \\= & 20 + \color{green}{40} + \color{red}{1} \\ = & \color{green}{60} + \color{red}{1} \\ = & \color{red}{61} \end{align}\)
6. \(\begin{align} & 22 + 50 \\ = & 50 + 22 \\= & 50 + \color{green}{20} + \color{red}{2} \\ = & \color{green}{70} + \color{red}{2} \\ = & \color{red}{72} \end{align}\)
7. \(\begin{align} & 40 + 52 \\= & 40 + \color{green}{50} + \color{red}{2} \\ = & \color{green}{90} + \color{red}{2} \\ = & \color{red}{92} \end{align}\)
8. \(\begin{align} & 36 + 10 \\ = & 10 + 36 \\= & 10 + \color{green}{30} + \color{red}{6} \\ = & \color{green}{40} + \color{red}{6} \\ = & \color{red}{46} \end{align}\)
9. \(\begin{align} & 14 + 80 \\ = & 80 + 14 \\= & 80 + \color{green}{10} + \color{red}{4} \\ = & \color{green}{90} + \color{red}{4} \\ = & \color{red}{94} \end{align}\)
10. \(\begin{align} & 20 + 68 \\= & 20 + \color{green}{60} + \color{red}{8} \\ = & \color{green}{80} + \color{red}{8} \\ = & \color{red}{88} \end{align}\)
11. \(\begin{align} & 30 + 14 \\= & 30 + \color{green}{10} + \color{red}{4} \\ = & \color{green}{40} + \color{red}{4} \\ = & \color{red}{44} \end{align}\)
12. \(\begin{align} & 56 + 40 \\ = & 40 + 56 \\= & 40 + \color{green}{50} + \color{red}{6} \\ = & \color{green}{90} + \color{red}{6} \\ = & \color{red}{96} \end{align}\)