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1. \(52 + 30 = \ldots\)
2. \(48 + 20 = \ldots\)
3. \(60 + 21 = \ldots\)
4. \(10 + 53 = \ldots\)
5. \(50 + 49 = \ldots\)
6. \(44 + 20 = \ldots\)
7. \(22 + 40 = \ldots\)
8. \(75 + 20 = \ldots\)
9. \(10 + 77 = \ldots\)
10. \(38 + 10 = \ldots\)
11. \(57 + 10 = \ldots\)
12. \(30 + 56 = \ldots\)

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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. \(\begin{align} & 48 + 20 \\ = & 20 + 48 \\= & 20 + \color{green}{40} + \color{red}{8} \\ = & \color{green}{60} + \color{red}{8} \\ = & \color{red}{68} \end{align}\)
3. \(\begin{align} & 60 + 21 \\= & 60 + \color{green}{20} + \color{red}{1} \\ = & \color{green}{80} + \color{red}{1} \\ = & \color{red}{81} \end{align}\)
4. \(\begin{align} & 10 + 53 \\= & 10 + \color{green}{50} + \color{red}{3} \\ = & \color{green}{60} + \color{red}{3} \\ = & \color{red}{63} \end{align}\)
5. \(\begin{align} & 50 + 49 \\= & 50 + \color{green}{40} + \color{red}{9} \\ = & \color{green}{90} + \color{red}{9} \\ = & \color{red}{99} \end{align}\)
6. \(\begin{align} & 44 + 20 \\ = & 20 + 44 \\= & 20 + \color{green}{40} + \color{red}{4} \\ = & \color{green}{60} + \color{red}{4} \\ = & \color{red}{64} \end{align}\)
7. \(\begin{align} & 22 + 40 \\ = & 40 + 22 \\= & 40 + \color{green}{20} + \color{red}{2} \\ = & \color{green}{60} + \color{red}{2} \\ = & \color{red}{62} \end{align}\)
8. \(\begin{align} & 75 + 20 \\ = & 20 + 75 \\= & 20 + \color{green}{70} + \color{red}{5} \\ = & \color{green}{90} + \color{red}{5} \\ = & \color{red}{95} \end{align}\)
9. \(\begin{align} & 10 + 77 \\= & 10 + \color{green}{70} + \color{red}{7} \\ = & \color{green}{80} + \color{red}{7} \\ = & \color{red}{87} \end{align}\)
10. \(\begin{align} & 38 + 10 \\ = & 10 + 38 \\= & 10 + \color{green}{30} + \color{red}{8} \\ = & \color{green}{40} + \color{red}{8} \\ = & \color{red}{48} \end{align}\)
11. \(\begin{align} & 57 + 10 \\ = & 10 + 57 \\= & 10 + \color{green}{50} + \color{red}{7} \\ = & \color{green}{60} + \color{red}{7} \\ = & \color{red}{67} \end{align}\)
12. \(\begin{align} & 30 + 56 \\= & 30 + \color{green}{50} + \color{red}{6} \\ = & \color{green}{80} + \color{red}{6} \\ = & \color{red}{86} \end{align}\)