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1. \(16 + 8 = \ldots\)
2. \(9 + 22 = \ldots\)
3. \(6 + 77 = \ldots\)
4. \(28 + 8 = \ldots\)
5. \(17 + 6 = \ldots\)
6. \(5 + 28 = \ldots\)
7. \(78 + 3 = \ldots\)
8. \(36 + 8 = \ldots\)
9. \(39 + 4 = \ldots\)
10. \(8 + 46 = \ldots\)
11. \(9 + 84 = \ldots\)
12. \(83 + 8 = \ldots\)

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Verbetersleutel

1. \(\begin{align} & 16 + 8 \\= & 16 + \color{green}{4} + \color{red}{4} \\= & \color{green}{20} + \color{red}{4} \\= & \color{red}{24} \end{align}\)
2. \(\begin{align} & 9 + 22 \\= & 22 + 9 \\= & 22 + \color{green}{8} + \color{red}{1} \\= & \color{green}{30} + \color{red}{1} \\= & \color{red}{31} \end{align}\)
3. \(\begin{align} & 6 + 77 \\= & 77 + 6 \\= & 77 + \color{green}{3} + \color{red}{3} \\= & \color{green}{80} + \color{red}{3} \\= & \color{red}{83} \end{align}\)
4. \(\begin{align} & 28 + 8 \\= & 28 + \color{green}{2} + \color{red}{6} \\= & \color{green}{30} + \color{red}{6} \\= & \color{red}{36} \end{align}\)
5. \(\begin{align} & 17 + 6 \\= & 17 + \color{green}{3} + \color{red}{3} \\= & \color{green}{20} + \color{red}{3} \\= & \color{red}{23} \end{align}\)
6. \(\begin{align} & 5 + 28 \\= & 28 + 5 \\= & 28 + \color{green}{2} + \color{red}{3} \\= & \color{green}{30} + \color{red}{3} \\= & \color{red}{33} \end{align}\)
7. \(\begin{align} & 78 + 3 \\= & 78 + \color{green}{2} + \color{red}{1} \\= & \color{green}{80} + \color{red}{1} \\= & \color{red}{81} \end{align}\)
8. \(\begin{align} & 36 + 8 \\= & 36 + \color{green}{4} + \color{red}{4} \\= & \color{green}{40} + \color{red}{4} \\= & \color{red}{44} \end{align}\)
9. \(\begin{align} & 39 + 4 \\= & 39 + \color{green}{1} + \color{red}{3} \\= & \color{green}{40} + \color{red}{3} \\= & \color{red}{43} \end{align}\)
10. \(\begin{align} & 8 + 46 \\= & 46 + 8 \\= & 46 + \color{green}{4} + \color{red}{4} \\= & \color{green}{50} + \color{red}{4} \\= & \color{red}{54} \end{align}\)
11. \(\begin{align} & 9 + 84 \\= & 84 + 9 \\= & 84 + \color{green}{6} + \color{red}{3} \\= & \color{green}{90} + \color{red}{3} \\= & \color{red}{93} \end{align}\)
12. \(\begin{align} & 83 + 8 \\= & 83 + \color{green}{7} + \color{red}{1} \\= & \color{green}{90} + \color{red}{1} \\= & \color{red}{91} \end{align}\)