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

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Verbetersleutel

1. \(7 + \color{red}{8} = 8 + \color{green}{7} = 8 + \color{green}{2 + 5} = 15\)
2. \(3 + \color{red}{14} = \color{red}{14} + 3 = 17\)
3. \(3 + \color{red}{9} = 9 + \color{green}{3} = 9 + \color{green}{1 + 2} = 12\)
4. \(7 + \color{red}{9} = 9 + \color{green}{7} = 9 + \color{green}{1 + 6} = 16\)
5. \(5 + \color{red}{12} = \color{red}{12} + 5 = 17\)
6. \(5 + \color{red}{14} = \color{red}{14} + 5 = 19\)
7. \(2 + \color{red}{15} = \color{red}{15} + 2 = 17\)
8. \(9 + \color{red}{2} = 9 + \color{red}{1} \color{red}{ + } \color{red}{1} = 11\)
9. \(9 + \color{red}{6} = 9 + \color{red}{1} \color{red}{ + } \color{red}{5} = 15\)
10. \(9 + \color{red}{3} = 9 + \color{red}{1} \color{red}{ + } \color{red}{2} = 12\)
11. \(2 + \color{red}{18} = \color{red}{18} + 2 = 20\)
12. \(8 + \color{red}{7} = 8 + \color{red}{2} \color{red}{ + } \color{red}{5} = 15\)