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1. \(60 + 32 = \ldots\)
2. \(52 + 30 = \ldots\)
3. \(10 + 86 = \ldots\)
4. \(0 + 98 = \ldots\)
5. \(23 + 50 = \ldots\)
6. \(10 + 49 = \ldots\)
7. \(14 + 80 = \ldots\)
8. \(57 + 20 = \ldots\)
9. \(12 + 50 = \ldots\)
10. \(35 + 40 = \ldots\)
11. \(40 + 37 = \ldots\)
12. \(19 + 70 = \ldots\)

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Verbetersleutel

1. \(\begin{align} & 60 + 32 \\= & 60 + \color{green}{30} + \color{red}{2} \\ = & \color{green}{90} + \color{red}{2} \\ = & \color{red}{92} \end{align}\)
2. \(\begin{align} & 52 + 30 \\ = & 30 + 52 \\= & 30 + \color{green}{50} + \color{red}{2} \\ = & \color{green}{80} + \color{red}{2} \\ = & \color{red}{82} \end{align}\)
3. \(\begin{align} & 10 + 86 \\= & 10 + \color{green}{80} + \color{red}{6} \\ = & \color{green}{90} + \color{red}{6} \\ = & \color{red}{96} \end{align}\)
4. \(\begin{align} & 0 + 98 \\= & 0 + \color{green}{90} + \color{red}{8} \\ = & \color{green}{90} + \color{red}{8} \\ = & \color{red}{98} \end{align}\)
5. \(\begin{align} & 23 + 50 \\ = & 50 + 23 \\= & 50 + \color{green}{20} + \color{red}{3} \\ = & \color{green}{70} + \color{red}{3} \\ = & \color{red}{73} \end{align}\)
6. \(\begin{align} & 10 + 49 \\= & 10 + \color{green}{40} + \color{red}{9} \\ = & \color{green}{50} + \color{red}{9} \\ = & \color{red}{59} \end{align}\)
7. \(\begin{align} & 14 + 80 \\ = & 80 + 14 \\= & 80 + \color{green}{10} + \color{red}{4} \\ = & \color{green}{90} + \color{red}{4} \\ = & \color{red}{94} \end{align}\)
8. \(\begin{align} & 57 + 20 \\ = & 20 + 57 \\= & 20 + \color{green}{50} + \color{red}{7} \\ = & \color{green}{70} + \color{red}{7} \\ = & \color{red}{77} \end{align}\)
9. \(\begin{align} & 12 + 50 \\ = & 50 + 12 \\= & 50 + \color{green}{10} + \color{red}{2} \\ = & \color{green}{60} + \color{red}{2} \\ = & \color{red}{62} \end{align}\)
10. \(\begin{align} & 35 + 40 \\ = & 40 + 35 \\= & 40 + \color{green}{30} + \color{red}{5} \\ = & \color{green}{70} + \color{red}{5} \\ = & \color{red}{75} \end{align}\)
11. \(\begin{align} & 40 + 37 \\= & 40 + \color{green}{30} + \color{red}{7} \\ = & \color{green}{70} + \color{red}{7} \\ = & \color{red}{77} \end{align}\)
12. \(\begin{align} & 19 + 70 \\ = & 70 + 19 \\= & 70 + \color{green}{10} + \color{red}{9} \\ = & \color{green}{80} + \color{red}{9} \\ = & \color{red}{89} \end{align}\)