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1. \(20 + 78 = \ldots\)
2. \(30 + 17 = \ldots\)
3. \(20 + 79 = \ldots\)
4. \(92 + 10 = \ldots\)
5. \(20 + 53 = \ldots\)
6. \(10 + 44 = \ldots\)
7. \(10 + 26 = \ldots\)
8. \(39 + 10 = \ldots\)
9. \(20 + 22 = \ldots\)
10. \(18 + 60 = \ldots\)
11. \(30 + 54 = \ldots\)
12. \(57 + 20 = \ldots\)

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Verbetersleutel

1. \(\begin{align} & 20 + 78 \\= & 20 + \color{green}{70} + \color{red}{8} \\ = & \color{green}{90} + \color{red}{8} \\ = & \color{red}{98} \end{align}\)
2. \(\begin{align} & 30 + 17 \\= & 30 + \color{green}{10} + \color{red}{7} \\ = & \color{green}{40} + \color{red}{7} \\ = & \color{red}{47} \end{align}\)
3. \(\begin{align} & 20 + 79 \\= & 20 + \color{green}{70} + \color{red}{9} \\ = & \color{green}{90} + \color{red}{9} \\ = & \color{red}{99} \end{align}\)
4. \(\begin{align} & 92 + 10 \\ = & 10 + 92 \\= & 10 + \color{green}{90} + \color{red}{2} \\ = & \color{green}{100} + \color{red}{2} \\ = & \color{red}{102} \end{align}\)
5. \(\begin{align} & 20 + 53 \\= & 20 + \color{green}{50} + \color{red}{3} \\ = & \color{green}{70} + \color{red}{3} \\ = & \color{red}{73} \end{align}\)
6. \(\begin{align} & 10 + 44 \\= & 10 + \color{green}{40} + \color{red}{4} \\ = & \color{green}{50} + \color{red}{4} \\ = & \color{red}{54} \end{align}\)
7. \(\begin{align} & 10 + 26 \\= & 10 + \color{green}{20} + \color{red}{6} \\ = & \color{green}{30} + \color{red}{6} \\ = & \color{red}{36} \end{align}\)
8. \(\begin{align} & 39 + 10 \\ = & 10 + 39 \\= & 10 + \color{green}{30} + \color{red}{9} \\ = & \color{green}{40} + \color{red}{9} \\ = & \color{red}{49} \end{align}\)
9. \(\begin{align} & 20 + 22 \\= & 20 + \color{green}{20} + \color{red}{2} \\ = & \color{green}{40} + \color{red}{2} \\ = & \color{red}{42} \end{align}\)
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. \(\begin{align} & 30 + 54 \\= & 30 + \color{green}{50} + \color{red}{4} \\ = & \color{green}{80} + \color{red}{4} \\ = & \color{red}{84} \end{align}\)
12. \(\begin{align} & 57 + 20 \\ = & 20 + 57 \\= & 20 + \color{green}{50} + \color{red}{7} \\ = & \color{green}{70} + \color{red}{7} \\ = & \color{red}{77} \end{align}\)