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1. \(40 + 49 = \ldots\)
2. \(32 + 10 = \ldots\)
3. \(53 + 30 = \ldots\)
4. \(10 + 19 = \ldots\)
5. \(50 + 48 = \ldots\)
6. \(20 + 37 = \ldots\)
7. \(10 + 33 = \ldots\)
8. \(58 + 30 = \ldots\)
9. \(10 + 51 = \ldots\)
10. \(40 + 51 = \ldots\)
11. \(61 + 10 = \ldots\)
12. \(93 + 10 = \ldots\)

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Verbetersleutel

1. \(\begin{align} & 40 + 49 \\= & 40 + \color{green}{40} + \color{red}{9} \\ = & \color{green}{80} + \color{red}{9} \\ = & \color{red}{89} \end{align}\)
2. \(\begin{align} & 32 + 10 \\ = & 10 + 32 \\= & 10 + \color{green}{30} + \color{red}{2} \\ = & \color{green}{40} + \color{red}{2} \\ = & \color{red}{42} \end{align}\)
3. \(\begin{align} & 53 + 30 \\ = & 30 + 53 \\= & 30 + \color{green}{50} + \color{red}{3} \\ = & \color{green}{80} + \color{red}{3} \\ = & \color{red}{83} \end{align}\)
4. \(\begin{align} & 10 + 19 \\= & 10 + \color{green}{10} + \color{red}{9} \\ = & \color{green}{20} + \color{red}{9} \\ = & \color{red}{29} \end{align}\)
5. \(\begin{align} & 50 + 48 \\= & 50 + \color{green}{40} + \color{red}{8} \\ = & \color{green}{90} + \color{red}{8} \\ = & \color{red}{98} \end{align}\)
6. \(\begin{align} & 20 + 37 \\= & 20 + \color{green}{30} + \color{red}{7} \\ = & \color{green}{50} + \color{red}{7} \\ = & \color{red}{57} \end{align}\)
7. \(\begin{align} & 10 + 33 \\= & 10 + \color{green}{30} + \color{red}{3} \\ = & \color{green}{40} + \color{red}{3} \\ = & \color{red}{43} \end{align}\)
8. \(\begin{align} & 58 + 30 \\ = & 30 + 58 \\= & 30 + \color{green}{50} + \color{red}{8} \\ = & \color{green}{80} + \color{red}{8} \\ = & \color{red}{88} \end{align}\)
9. \(\begin{align} & 10 + 51 \\= & 10 + \color{green}{50} + \color{red}{1} \\ = & \color{green}{60} + \color{red}{1} \\ = & \color{red}{61} \end{align}\)
10. \(\begin{align} & 40 + 51 \\= & 40 + \color{green}{50} + \color{red}{1} \\ = & \color{green}{90} + \color{red}{1} \\ = & \color{red}{91} \end{align}\)
11. \(\begin{align} & 61 + 10 \\ = & 10 + 61 \\= & 10 + \color{green}{60} + \color{red}{1} \\ = & \color{green}{70} + \color{red}{1} \\ = & \color{red}{71} \end{align}\)
12. \(\begin{align} & 93 + 10 \\ = & 10 + 93 \\= & 10 + \color{green}{90} + \color{red}{3} \\ = & \color{green}{100} + \color{red}{3} \\ = & \color{red}{103} \end{align}\)