Brug over 10 (reeks 2)

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1. \(4 + 9 = \)
2. \(9 + 3 = \)
3. \(3 + 8 = \)
4. \(6 + 7 = \)
5. \(9 + 9 = \)
6. \(7 + 7 = \)
7. \(5 + 6 = \)
8. \(5 + 9 = \)
9. \(7 + 5 = \)
10. \(6 + 6 = \)
11. \(2 + 9 = \)
12. \(7 + 4 = \)

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Verbetersleutel

1. \(\begin{align} & 4 + 9 \\= & 9 + 4 \\= & 9 + \color{green}{1} + \color{red}{3} \\= & \color{green}{10} + \color{red}{3} \\= & \color{red}{13} \end{align}\)
2. \(\begin{align} & 9 + 3 \\= & 9 + \color{green}{1} + \color{red}{2} \\= & \color{green}{10} + \color{red}{2} \\= & \color{red}{12} \end{align}\)
3. \(\begin{align} & 3 + 8 \\= & 8 + 3 \\= & 8 + \color{green}{2} + \color{red}{1} \\= & \color{green}{10} + \color{red}{1} \\= & \color{red}{11} \end{align}\)
4. \(\begin{align} & 6 + 7 \\= & 6 + \color{green}{4} + \color{red}{3} \\= & \color{green}{10} + \color{red}{3} \\= & \color{red}{13} \end{align}\)
5. \(\begin{align} & 9 + 9 \\= & 9 + \color{green}{1} + \color{red}{8} \\= & \color{green}{10} + \color{red}{8} \\= & \color{red}{18} \end{align}\)
6. \(\begin{align} & 7 + 7 \\= & 7 + \color{green}{3} + \color{red}{4} \\= & \color{green}{10} + \color{red}{4} \\= & \color{red}{14} \end{align}\)
7. \(\begin{align} & 5 + 6 \\= & 5 + \color{green}{5} + \color{red}{1} \\= & \color{green}{10} + \color{red}{1} \\= & \color{red}{11} \end{align}\)
8. \(\begin{align} & 5 + 9 \\= & 5 + \color{green}{5} + \color{red}{4} \\= & \color{green}{10} + \color{red}{4} \\= & \color{red}{14} \end{align}\)
9. \(\begin{align} & 7 + 5 \\= & 7 + \color{green}{3} + \color{red}{2} \\= & \color{green}{10} + \color{red}{2} \\= & \color{red}{12} \end{align}\)
10. \(\begin{align} & 6 + 6 \\= & 6 + \color{green}{4} + \color{red}{2} \\= & \color{green}{10} + \color{red}{2} \\= & \color{red}{12} \end{align}\)
11. \(\begin{align} & 2 + 9 \\= & 9 + 2 \\= & 9 + \color{green}{1} + \color{red}{1} \\= & \color{green}{10} + \color{red}{1} \\= & \color{red}{11} \end{align}\)
12. \(\begin{align} & 7 + 4 \\= & 7 + \color{green}{3} + \color{red}{1} \\= & \color{green}{10} + \color{red}{1} \\= & \color{red}{11} \end{align}\)