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

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Verbetersleutel

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