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

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Verbetersleutel

1. \(2 + \color{red}{14} = \color{red}{14} + 2 = 16\)
2. \(4 + \color{red}{14} = \color{red}{14} + 4 = 18\)
3. \(2 + \color{red}{12} = \color{red}{12} + 2 = 14\)
4. \(9 + \color{red}{2} = 9 + \color{red}{1} \color{red}{ + } \color{red}{1} = 11\)
5. \(2 + \color{red}{17} = \color{red}{17} + 2 = 19\)
6. \(4 + \color{red}{7} = 7 + \color{green}{4} = 7 + \color{green}{3 + 1} = 11\)
7. \(3 + \color{red}{12} = \color{red}{12} + 3 = 15\)
8. \(6 + \color{red}{7} = 7 + \color{green}{6} = 7 + \color{green}{3 + 3} = 13\)
9. \(7 + \color{red}{8} = 8 + \color{green}{7} = 8 + \color{green}{2 + 5} = 15\)
10. \(2 + \color{red}{16} = \color{red}{16} + 2 = 18\)
11. \(9 + \color{red}{11} = \color{red}{11} + 9 = 20\)
12. \(6 + \color{red}{8} = 8 + \color{green}{6} = 8 + \color{green}{2 + 4} = 14\)