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

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Verbetersleutel

1. \(3 + \color{red}{12} = \color{red}{12} + 3 = 15\)
2. \(5 + \color{red}{11} = \color{red}{11} + 5 = 16\)
3. \(3 + \color{red}{17} = \color{red}{17} + 3 = 20\)
4. \(4 + \color{red}{7} = 7 + \color{green}{4} = 7 + \color{green}{3 + 1} = 11\)
5. \(3 + \color{red}{11} = \color{red}{11} + 3 = 14\)
6. \(8 + \color{red}{5} = 8 + \color{red}{2} \color{red}{ + } \color{red}{3} = 13\)
7. \(3 + \color{red}{14} = \color{red}{14} + 3 = 17\)
8. \(8 + \color{red}{9} = 9 + \color{green}{8} = 9 + \color{green}{1 + 7} = 17\)
9. \(3 + \color{red}{10} = \color{red}{10} + 3 = 13\)
10. \(7 + \color{red}{5} = 7 + \color{red}{3} \color{red}{ + } \color{red}{2} = 12\)
11. \(2 + \color{red}{14} = \color{red}{14} + 2 = 16\)
12. \(8 + \color{red}{10} = \color{red}{10} + 8 = 18\)