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

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Verbetersleutel

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