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

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Verbetersleutel

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