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

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Verbetersleutel

1. \(7 + \color{red}{10} = \color{red}{10} + 7 = 17\)
2. \(7 + \color{red}{7} = 7 + \color{red}{3} \color{red}{ + } \color{red}{4} = 14\)
3. \(2 + \color{red}{10} = \color{red}{10} + 2 = 12\)
4. \(7 + \color{red}{9} = 9 + \color{green}{7} = 9 + \color{green}{1 + 6} = 16\)
5. \(5 + \color{red}{13} = \color{red}{13} + 5 = 18\)
6. \(5 + \color{red}{11} = \color{red}{11} + 5 = 16\)
7. \(7 + \color{red}{4} = 7 + \color{red}{3} \color{red}{ + } \color{red}{1} = 11\)
8. \(2 + \color{red}{11} = \color{red}{11} + 2 = 13\)
9. \(4 + \color{red}{13} = \color{red}{13} + 4 = 17\)
10. \(3 + \color{red}{13} = \color{red}{13} + 3 = 16\)
11. \(7 + \color{red}{12} = \color{red}{12} + 7 = 19\)
12. \(8 + \color{red}{12} = \color{red}{12} + 8 = 20\)