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

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Verbetersleutel

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