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1. \(35 + 60 = \ldots\)
2. \(48 + 50 = \ldots\)
3. \(60 + 23 = \ldots\)
4. \(81 + 10 = \ldots\)
5. \(42 + 10 = \ldots\)
6. \(30 + 43 = \ldots\)
7. \(19 + 50 = \ldots\)
8. \(29 + 60 = \ldots\)
9. \(40 + 42 = \ldots\)
10. \(25 + 10 = \ldots\)
11. \(60 + 22 = \ldots\)
12. \(48 + 20 = \ldots\)

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Verbetersleutel

1. \(\begin{align} & 35 + 60 \\ = & 60 + 35 \\= & 60 + \color{green}{30} + \color{red}{5} \\ = & \color{green}{90} + \color{red}{5} \\ = & \color{red}{95} \end{align}\)
2. \(\begin{align} & 48 + 50 \\ = & 50 + 48 \\= & 50 + \color{green}{40} + \color{red}{8} \\ = & \color{green}{90} + \color{red}{8} \\ = & \color{red}{98} \end{align}\)
3. \(\begin{align} & 60 + 23 \\= & 60 + \color{green}{20} + \color{red}{3} \\ = & \color{green}{80} + \color{red}{3} \\ = & \color{red}{83} \end{align}\)
4. \(\begin{align} & 81 + 10 \\ = & 10 + 81 \\= & 10 + \color{green}{80} + \color{red}{1} \\ = & \color{green}{90} + \color{red}{1} \\ = & \color{red}{91} \end{align}\)
5. \(\begin{align} & 42 + 10 \\ = & 10 + 42 \\= & 10 + \color{green}{40} + \color{red}{2} \\ = & \color{green}{50} + \color{red}{2} \\ = & \color{red}{52} \end{align}\)
6. \(\begin{align} & 30 + 43 \\= & 30 + \color{green}{40} + \color{red}{3} \\ = & \color{green}{70} + \color{red}{3} \\ = & \color{red}{73} \end{align}\)
7. \(\begin{align} & 19 + 50 \\ = & 50 + 19 \\= & 50 + \color{green}{10} + \color{red}{9} \\ = & \color{green}{60} + \color{red}{9} \\ = & \color{red}{69} \end{align}\)
8. \(\begin{align} & 29 + 60 \\ = & 60 + 29 \\= & 60 + \color{green}{20} + \color{red}{9} \\ = & \color{green}{80} + \color{red}{9} \\ = & \color{red}{89} \end{align}\)
9. \(\begin{align} & 40 + 42 \\= & 40 + \color{green}{40} + \color{red}{2} \\ = & \color{green}{80} + \color{red}{2} \\ = & \color{red}{82} \end{align}\)
10. \(\begin{align} & 25 + 10 \\ = & 10 + 25 \\= & 10 + \color{green}{20} + \color{red}{5} \\ = & \color{green}{30} + \color{red}{5} \\ = & \color{red}{35} \end{align}\)
11. \(\begin{align} & 60 + 22 \\= & 60 + \color{green}{20} + \color{red}{2} \\ = & \color{green}{80} + \color{red}{2} \\ = & \color{red}{82} \end{align}\)
12. \(\begin{align} & 48 + 20 \\ = & 20 + 48 \\= & 20 + \color{green}{40} + \color{red}{8} \\ = & \color{green}{60} + \color{red}{8} \\ = & \color{red}{68} \end{align}\)