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

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Verbetersleutel

1. \(6 + \color{red}{7} = 7 + \color{green}{6} = 7 + \color{green}{3 + 3} = 13\)
2. \(5 + \color{red}{8} = 8 + \color{green}{5} = 8 + \color{green}{2 + 3} = 13\)
3. \(2 + \color{red}{11} = \color{red}{11} + 2 = 13\)
4. \(7 + \color{red}{9} = 9 + \color{green}{7} = 9 + \color{green}{1 + 6} = 16\)
5. \(6 + \color{red}{13} = \color{red}{13} + 6 = 19\)
6. \(5 + \color{red}{9} = 9 + \color{green}{5} = 9 + \color{green}{1 + 4} = 14\)
7. \(6 + \color{red}{8} = 8 + \color{green}{6} = 8 + \color{green}{2 + 4} = 14\)
8. \(4 + \color{red}{14} = \color{red}{14} + 4 = 18\)
9. \(5 + \color{red}{13} = \color{red}{13} + 5 = 18\)
10. \(2 + \color{red}{10} = \color{red}{10} + 2 = 12\)
11. \(8 + \color{red}{9} = 9 + \color{green}{8} = 9 + \color{green}{1 + 7} = 17\)
12. \(4 + \color{red}{7} = 7 + \color{green}{4} = 7 + \color{green}{3 + 1} = 11\)