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1. \(20 + 15 = \ldots\)
2. \(10 + 64 = \ldots\)
3. \(70 + 24 = \ldots\)
4. \(10 + 51 = \ldots\)
5. \(10 + 42 = \ldots\)
6. \(44 + 40 = \ldots\)
7. \(10 + 88 = \ldots\)
8. \(87 + 10 = \ldots\)
9. \(11 + 30 = \ldots\)
10. \(45 + 40 = \ldots\)
11. \(35 + 60 = \ldots\)
12. \(57 + 20 = \ldots\)

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Verbetersleutel

1. \(\begin{align} & 20 + 15 \\= & 20 + \color{green}{10} + \color{red}{5} \\ = & \color{green}{30} + \color{red}{5} \\ = & \color{red}{35} \end{align}\)
2. \(\begin{align} & 10 + 64 \\= & 10 + \color{green}{60} + \color{red}{4} \\ = & \color{green}{70} + \color{red}{4} \\ = & \color{red}{74} \end{align}\)
3. \(\begin{align} & 70 + 24 \\= & 70 + \color{green}{20} + \color{red}{4} \\ = & \color{green}{90} + \color{red}{4} \\ = & \color{red}{94} \end{align}\)
4. \(\begin{align} & 10 + 51 \\= & 10 + \color{green}{50} + \color{red}{1} \\ = & \color{green}{60} + \color{red}{1} \\ = & \color{red}{61} \end{align}\)
5. \(\begin{align} & 10 + 42 \\= & 10 + \color{green}{40} + \color{red}{2} \\ = & \color{green}{50} + \color{red}{2} \\ = & \color{red}{52} \end{align}\)
6. \(\begin{align} & 44 + 40 \\ = & 40 + 44 \\= & 40 + \color{green}{40} + \color{red}{4} \\ = & \color{green}{80} + \color{red}{4} \\ = & \color{red}{84} \end{align}\)
7. \(\begin{align} & 10 + 88 \\= & 10 + \color{green}{80} + \color{red}{8} \\ = & \color{green}{90} + \color{red}{8} \\ = & \color{red}{98} \end{align}\)
8. \(\begin{align} & 87 + 10 \\ = & 10 + 87 \\= & 10 + \color{green}{80} + \color{red}{7} \\ = & \color{green}{90} + \color{red}{7} \\ = & \color{red}{97} \end{align}\)
9. \(\begin{align} & 11 + 30 \\ = & 30 + 11 \\= & 30 + \color{green}{10} + \color{red}{1} \\ = & \color{green}{40} + \color{red}{1} \\ = & \color{red}{41} \end{align}\)
10. \(\begin{align} & 45 + 40 \\ = & 40 + 45 \\= & 40 + \color{green}{40} + \color{red}{5} \\ = & \color{green}{80} + \color{red}{5} \\ = & \color{red}{85} \end{align}\)
11. \(\begin{align} & 35 + 60 \\ = & 60 + 35 \\= & 60 + \color{green}{30} + \color{red}{5} \\ = & \color{green}{90} + \color{red}{5} \\ = & \color{red}{95} \end{align}\)
12. \(\begin{align} & 57 + 20 \\ = & 20 + 57 \\= & 20 + \color{green}{50} + \color{red}{7} \\ = & \color{green}{70} + \color{red}{7} \\ = & \color{red}{77} \end{align}\)