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

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Verbetersleutel

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