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

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Verbetersleutel

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