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1. \(10 + 69 = \ldots\)
2. \(12 + 50 = \ldots\)
3. \(20 + 49 = \ldots\)
4. \(33 + 20 = \ldots\)
5. \(30 + 44 = \ldots\)
6. \(73 + 20 = \ldots\)
7. \(28 + 10 = \ldots\)
8. \(60 + 14 = \ldots\)
9. \(30 + 39 = \ldots\)
10. \(0 + 98 = \ldots\)
11. \(10 + 83 = \ldots\)
12. \(45 + 30 = \ldots\)

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Verbetersleutel

1. \(\begin{align} & 10 + 69 \\= & 10 + \color{green}{60} + \color{red}{9} \\ = & \color{green}{70} + \color{red}{9} \\ = & \color{red}{79} \end{align}\)
2. \(\begin{align} & 12 + 50 \\ = & 50 + 12 \\= & 50 + \color{green}{10} + \color{red}{2} \\ = & \color{green}{60} + \color{red}{2} \\ = & \color{red}{62} \end{align}\)
3. \(\begin{align} & 20 + 49 \\= & 20 + \color{green}{40} + \color{red}{9} \\ = & \color{green}{60} + \color{red}{9} \\ = & \color{red}{69} \end{align}\)
4. \(\begin{align} & 33 + 20 \\ = & 20 + 33 \\= & 20 + \color{green}{30} + \color{red}{3} \\ = & \color{green}{50} + \color{red}{3} \\ = & \color{red}{53} \end{align}\)
5. \(\begin{align} & 30 + 44 \\= & 30 + \color{green}{40} + \color{red}{4} \\ = & \color{green}{70} + \color{red}{4} \\ = & \color{red}{74} \end{align}\)
6. \(\begin{align} & 73 + 20 \\ = & 20 + 73 \\= & 20 + \color{green}{70} + \color{red}{3} \\ = & \color{green}{90} + \color{red}{3} \\ = & \color{red}{93} \end{align}\)
7. \(\begin{align} & 28 + 10 \\ = & 10 + 28 \\= & 10 + \color{green}{20} + \color{red}{8} \\ = & \color{green}{30} + \color{red}{8} \\ = & \color{red}{38} \end{align}\)
8. \(\begin{align} & 60 + 14 \\= & 60 + \color{green}{10} + \color{red}{4} \\ = & \color{green}{70} + \color{red}{4} \\ = & \color{red}{74} \end{align}\)
9. \(\begin{align} & 30 + 39 \\= & 30 + \color{green}{30} + \color{red}{9} \\ = & \color{green}{60} + \color{red}{9} \\ = & \color{red}{69} \end{align}\)
10. \(\begin{align} & 0 + 98 \\= & 0 + \color{green}{90} + \color{red}{8} \\ = & \color{green}{90} + \color{red}{8} \\ = & \color{red}{98} \end{align}\)
11. \(\begin{align} & 10 + 83 \\= & 10 + \color{green}{80} + \color{red}{3} \\ = & \color{green}{90} + \color{red}{3} \\ = & \color{red}{93} \end{align}\)
12. \(\begin{align} & 45 + 30 \\ = & 30 + 45 \\= & 30 + \color{green}{40} + \color{red}{5} \\ = & \color{green}{70} + \color{red}{5} \\ = & \color{red}{75} \end{align}\)