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1. \(40 + 34 = \ldots\)
2. \(27 + 40 = \ldots\)
3. \(69 + 10 = \ldots\)
4. \(30 + 25 = \ldots\)
5. \(10 + 41 = \ldots\)
6. \(10 + 72 = \ldots\)
7. \(60 + 23 = \ldots\)
8. \(10 + 45 = \ldots\)
9. \(99 + 10 = \ldots\)
10. \(49 + 20 = \ldots\)
11. \(73 + 20 = \ldots\)
12. \(20 + 47 = \ldots\)

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Verbetersleutel

1. \(\begin{align} & 40 + 34 \\= & 40 + \color{green}{30} + \color{red}{4} \\ = & \color{green}{70} + \color{red}{4} \\ = & \color{red}{74} \end{align}\)
2. \(\begin{align} & 27 + 40 \\ = & 40 + 27 \\= & 40 + \color{green}{20} + \color{red}{7} \\ = & \color{green}{60} + \color{red}{7} \\ = & \color{red}{67} \end{align}\)
3. \(\begin{align} & 69 + 10 \\ = & 10 + 69 \\= & 10 + \color{green}{60} + \color{red}{9} \\ = & \color{green}{70} + \color{red}{9} \\ = & \color{red}{79} \end{align}\)
4. \(\begin{align} & 30 + 25 \\= & 30 + \color{green}{20} + \color{red}{5} \\ = & \color{green}{50} + \color{red}{5} \\ = & \color{red}{55} \end{align}\)
5. \(\begin{align} & 10 + 41 \\= & 10 + \color{green}{40} + \color{red}{1} \\ = & \color{green}{50} + \color{red}{1} \\ = & \color{red}{51} \end{align}\)
6. \(\begin{align} & 10 + 72 \\= & 10 + \color{green}{70} + \color{red}{2} \\ = & \color{green}{80} + \color{red}{2} \\ = & \color{red}{82} \end{align}\)
7. \(\begin{align} & 60 + 23 \\= & 60 + \color{green}{20} + \color{red}{3} \\ = & \color{green}{80} + \color{red}{3} \\ = & \color{red}{83} \end{align}\)
8. \(\begin{align} & 10 + 45 \\= & 10 + \color{green}{40} + \color{red}{5} \\ = & \color{green}{50} + \color{red}{5} \\ = & \color{red}{55} \end{align}\)
9. \(\begin{align} & 99 + 10 \\ = & 10 + 99 \\= & 10 + \color{green}{90} + \color{red}{9} \\ = & \color{green}{100} + \color{red}{9} \\ = & \color{red}{109} \end{align}\)
10. \(\begin{align} & 49 + 20 \\ = & 20 + 49 \\= & 20 + \color{green}{40} + \color{red}{9} \\ = & \color{green}{60} + \color{red}{9} \\ = & \color{red}{69} \end{align}\)
11. \(\begin{align} & 73 + 20 \\ = & 20 + 73 \\= & 20 + \color{green}{70} + \color{red}{3} \\ = & \color{green}{90} + \color{red}{3} \\ = & \color{red}{93} \end{align}\)
12. \(\begin{align} & 20 + 47 \\= & 20 + \color{green}{40} + \color{red}{7} \\ = & \color{green}{60} + \color{red}{7} \\ = & \color{red}{67} \end{align}\)