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1. \(46 + 40 = \ldots\)
2. \(28 + 20 = \ldots\)
3. \(16 + 50 = \ldots\)
4. \(27 + 10 = \ldots\)
5. \(10 + 44 = \ldots\)
6. \(34 + 40 = \ldots\)
7. \(10 + 97 = \ldots\)
8. \(0 + 93 = \ldots\)
9. \(35 + 50 = \ldots\)
10. \(18 + 60 = \ldots\)
11. \(60 + 25 = \ldots\)
12. \(94 + 0 = \ldots\)

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Verbetersleutel

1. \(\begin{align} & 46 + 40 \\ = & 40 + 46 \\= & 40 + \color{green}{40} + \color{red}{6} \\ = & \color{green}{80} + \color{red}{6} \\ = & \color{red}{86} \end{align}\)
2. \(\begin{align} & 28 + 20 \\ = & 20 + 28 \\= & 20 + \color{green}{20} + \color{red}{8} \\ = & \color{green}{40} + \color{red}{8} \\ = & \color{red}{48} \end{align}\)
3. \(\begin{align} & 16 + 50 \\ = & 50 + 16 \\= & 50 + \color{green}{10} + \color{red}{6} \\ = & \color{green}{60} + \color{red}{6} \\ = & \color{red}{66} \end{align}\)
4. \(\begin{align} & 27 + 10 \\ = & 10 + 27 \\= & 10 + \color{green}{20} + \color{red}{7} \\ = & \color{green}{30} + \color{red}{7} \\ = & \color{red}{37} \end{align}\)
5. \(\begin{align} & 10 + 44 \\= & 10 + \color{green}{40} + \color{red}{4} \\ = & \color{green}{50} + \color{red}{4} \\ = & \color{red}{54} \end{align}\)
6. \(\begin{align} & 34 + 40 \\ = & 40 + 34 \\= & 40 + \color{green}{30} + \color{red}{4} \\ = & \color{green}{70} + \color{red}{4} \\ = & \color{red}{74} \end{align}\)
7. \(\begin{align} & 10 + 97 \\= & 10 + \color{green}{90} + \color{red}{7} \\ = & \color{green}{100} + \color{red}{7} \\ = & \color{red}{107} \end{align}\)
8. \(\begin{align} & 0 + 93 \\= & 0 + \color{green}{90} + \color{red}{3} \\ = & \color{green}{90} + \color{red}{3} \\ = & \color{red}{93} \end{align}\)
9. \(\begin{align} & 35 + 50 \\ = & 50 + 35 \\= & 50 + \color{green}{30} + \color{red}{5} \\ = & \color{green}{80} + \color{red}{5} \\ = & \color{red}{85} \end{align}\)
10. \(\begin{align} & 18 + 60 \\ = & 60 + 18 \\= & 60 + \color{green}{10} + \color{red}{8} \\ = & \color{green}{70} + \color{red}{8} \\ = & \color{red}{78} \end{align}\)
11. \(\begin{align} & 60 + 25 \\= & 60 + \color{green}{20} + \color{red}{5} \\ = & \color{green}{80} + \color{red}{5} \\ = & \color{red}{85} \end{align}\)
12. \(\begin{align} & 94 + 0 \\ = & 0 + 94 \\= & 0 + \color{green}{90} + \color{red}{4} \\ = & \color{green}{90} + \color{red}{4} \\ = & \color{red}{94} \end{align}\)