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1. \(20 + 43 = \ldots\)
2. \(38 + 60 = \ldots\)
3. \(57 + 20 = \ldots\)
4. \(30 + 56 = \ldots\)
5. \(72 + 20 = \ldots\)
6. \(41 + 40 = \ldots\)
7. \(13 + 20 = \ldots\)
8. \(50 + 28 = \ldots\)
9. \(20 + 31 = \ldots\)
10. \(31 + 10 = \ldots\)
11. \(40 + 59 = \ldots\)
12. \(80 + 13 = \ldots\)

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Verbetersleutel

1. \(\begin{align} & 20 + 43 \\= & 20 + \color{green}{40} + \color{red}{3} \\ = & \color{green}{60} + \color{red}{3} \\ = & \color{red}{63} \end{align}\)
2. \(\begin{align} & 38 + 60 \\ = & 60 + 38 \\= & 60 + \color{green}{30} + \color{red}{8} \\ = & \color{green}{90} + \color{red}{8} \\ = & \color{red}{98} \end{align}\)
3. \(\begin{align} & 57 + 20 \\ = & 20 + 57 \\= & 20 + \color{green}{50} + \color{red}{7} \\ = & \color{green}{70} + \color{red}{7} \\ = & \color{red}{77} \end{align}\)
4. \(\begin{align} & 30 + 56 \\= & 30 + \color{green}{50} + \color{red}{6} \\ = & \color{green}{80} + \color{red}{6} \\ = & \color{red}{86} \end{align}\)
5. \(\begin{align} & 72 + 20 \\ = & 20 + 72 \\= & 20 + \color{green}{70} + \color{red}{2} \\ = & \color{green}{90} + \color{red}{2} \\ = & \color{red}{92} \end{align}\)
6. \(\begin{align} & 41 + 40 \\ = & 40 + 41 \\= & 40 + \color{green}{40} + \color{red}{1} \\ = & \color{green}{80} + \color{red}{1} \\ = & \color{red}{81} \end{align}\)
7. \(\begin{align} & 13 + 20 \\ = & 20 + 13 \\= & 20 + \color{green}{10} + \color{red}{3} \\ = & \color{green}{30} + \color{red}{3} \\ = & \color{red}{33} \end{align}\)
8. \(\begin{align} & 50 + 28 \\= & 50 + \color{green}{20} + \color{red}{8} \\ = & \color{green}{70} + \color{red}{8} \\ = & \color{red}{78} \end{align}\)
9. \(\begin{align} & 20 + 31 \\= & 20 + \color{green}{30} + \color{red}{1} \\ = & \color{green}{50} + \color{red}{1} \\ = & \color{red}{51} \end{align}\)
10. \(\begin{align} & 31 + 10 \\ = & 10 + 31 \\= & 10 + \color{green}{30} + \color{red}{1} \\ = & \color{green}{40} + \color{red}{1} \\ = & \color{red}{41} \end{align}\)
11. \(\begin{align} & 40 + 59 \\= & 40 + \color{green}{50} + \color{red}{9} \\ = & \color{green}{90} + \color{red}{9} \\ = & \color{red}{99} \end{align}\)
12. \(\begin{align} & 80 + 13 \\= & 80 + \color{green}{10} + \color{red}{3} \\ = & \color{green}{90} + \color{red}{3} \\ = & \color{red}{93} \end{align}\)