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

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Verbetersleutel

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