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

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Verbetersleutel

1. \(2 + \color{red}{15} = \color{red}{15} + 2 = 17\)
2. \(7 + \color{red}{8} = 8 + \color{green}{7} = 8 + \color{green}{2 + 5} = 15\)
3. \(3 + \color{red}{14} = \color{red}{14} + 3 = 17\)
4. \(8 + \color{red}{8} = 8 + \color{red}{2} \color{red}{ + } \color{red}{6} = 16\)
5. \(8 + \color{red}{9} = 9 + \color{green}{8} = 9 + \color{green}{1 + 7} = 17\)
6. \(9 + \color{red}{8} = 9 + \color{red}{1} \color{red}{ + } \color{red}{7} = 17\)
7. \(7 + \color{red}{13} = \color{red}{13} + 7 = 20\)
8. \(4 + \color{red}{12} = \color{red}{12} + 4 = 16\)
9. \(6 + \color{red}{8} = 8 + \color{green}{6} = 8 + \color{green}{2 + 4} = 14\)
10. \(7 + \color{red}{10} = \color{red}{10} + 7 = 17\)
11. \(9 + \color{red}{5} = 9 + \color{red}{1} \color{red}{ + } \color{red}{4} = 14\)
12. \(9 + \color{red}{4} = 9 + \color{red}{1} \color{red}{ + } \color{red}{3} = 13\)