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

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Verbetersleutel

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