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1. \(39 + 20 = \ldots\)
2. \(36 + 20 = \ldots\)
3. \(22 + 30 = \ldots\)
4. \(56 + 40 = \ldots\)
5. \(30 + 28 = \ldots\)
6. \(38 + 40 = \ldots\)
7. \(13 + 80 = \ldots\)
8. \(20 + 22 = \ldots\)
9. \(88 + 10 = \ldots\)
10. \(45 + 10 = \ldots\)
11. \(32 + 20 = \ldots\)
12. \(89 + 10 = \ldots\)

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Verbetersleutel

1. \(\begin{align} & 39 + 20 \\ = & 20 + 39 \\= & 20 + \color{green}{30} + \color{red}{9} \\ = & \color{green}{50} + \color{red}{9} \\ = & \color{red}{59} \end{align}\)
2. \(\begin{align} & 36 + 20 \\ = & 20 + 36 \\= & 20 + \color{green}{30} + \color{red}{6} \\ = & \color{green}{50} + \color{red}{6} \\ = & \color{red}{56} \end{align}\)
3. \(\begin{align} & 22 + 30 \\ = & 30 + 22 \\= & 30 + \color{green}{20} + \color{red}{2} \\ = & \color{green}{50} + \color{red}{2} \\ = & \color{red}{52} \end{align}\)
4. \(\begin{align} & 56 + 40 \\ = & 40 + 56 \\= & 40 + \color{green}{50} + \color{red}{6} \\ = & \color{green}{90} + \color{red}{6} \\ = & \color{red}{96} \end{align}\)
5. \(\begin{align} & 30 + 28 \\= & 30 + \color{green}{20} + \color{red}{8} \\ = & \color{green}{50} + \color{red}{8} \\ = & \color{red}{58} \end{align}\)
6. \(\begin{align} & 38 + 40 \\ = & 40 + 38 \\= & 40 + \color{green}{30} + \color{red}{8} \\ = & \color{green}{70} + \color{red}{8} \\ = & \color{red}{78} \end{align}\)
7. \(\begin{align} & 13 + 80 \\ = & 80 + 13 \\= & 80 + \color{green}{10} + \color{red}{3} \\ = & \color{green}{90} + \color{red}{3} \\ = & \color{red}{93} \end{align}\)
8. \(\begin{align} & 20 + 22 \\= & 20 + \color{green}{20} + \color{red}{2} \\ = & \color{green}{40} + \color{red}{2} \\ = & \color{red}{42} \end{align}\)
9. \(\begin{align} & 88 + 10 \\ = & 10 + 88 \\= & 10 + \color{green}{80} + \color{red}{8} \\ = & \color{green}{90} + \color{red}{8} \\ = & \color{red}{98} \end{align}\)
10. \(\begin{align} & 45 + 10 \\ = & 10 + 45 \\= & 10 + \color{green}{40} + \color{red}{5} \\ = & \color{green}{50} + \color{red}{5} \\ = & \color{red}{55} \end{align}\)
11. \(\begin{align} & 32 + 20 \\ = & 20 + 32 \\= & 20 + \color{green}{30} + \color{red}{2} \\ = & \color{green}{50} + \color{red}{2} \\ = & \color{red}{52} \end{align}\)
12. \(\begin{align} & 89 + 10 \\ = & 10 + 89 \\= & 10 + \color{green}{80} + \color{red}{9} \\ = & \color{green}{90} + \color{red}{9} \\ = & \color{red}{99} \end{align}\)