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

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Verbetersleutel

1. \(9 + \color{red}{2} = 9 + \color{red}{1} \color{red}{ + } \color{red}{1} = 11\)
2. \(4 + \color{red}{11} = \color{red}{11} + 4 = 15\)
3. \(3 + \color{red}{11} = \color{red}{11} + 3 = 14\)
4. \(4 + \color{red}{12} = \color{red}{12} + 4 = 16\)
5. \(7 + \color{red}{12} = \color{red}{12} + 7 = 19\)
6. \(5 + \color{red}{7} = 7 + \color{green}{5} = 7 + \color{green}{3 + 2} = 12\)
7. \(9 + \color{red}{8} = 9 + \color{red}{1} \color{red}{ + } \color{red}{7} = 17\)
8. \(9 + \color{red}{5} = 9 + \color{red}{1} \color{red}{ + } \color{red}{4} = 14\)
9. \(3 + \color{red}{10} = \color{red}{10} + 3 = 13\)
10. \(7 + \color{red}{7} = 7 + \color{red}{3} \color{red}{ + } \color{red}{4} = 14\)
11. \(5 + \color{red}{12} = \color{red}{12} + 5 = 17\)
12. \(5 + \color{red}{15} = \color{red}{15} + 5 = 20\)