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

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Verbetersleutel

1. \(7 + \color{red}{13} = \color{red}{13} + 7 = 20\)
2. \(3 + \color{red}{12} = \color{red}{12} + 3 = 15\)
3. \(8 + \color{red}{4} = 8 + \color{red}{2} \color{red}{ + } \color{red}{2} = 12\)
4. \(8 + \color{red}{11} = \color{red}{11} + 8 = 19\)
5. \(9 + \color{red}{8} = 9 + \color{red}{1} \color{red}{ + } \color{red}{7} = 17\)
6. \(2 + \color{red}{12} = \color{red}{12} + 2 = 14\)
7. \(3 + \color{red}{10} = \color{red}{10} + 3 = 13\)
8. \(2 + \color{red}{9} = 9 + \color{green}{2} = 9 + \color{green}{1 + 1} = 11\)
9. \(2 + \color{red}{18} = \color{red}{18} + 2 = 20\)
10. \(7 + \color{red}{12} = \color{red}{12} + 7 = 19\)
11. \(9 + \color{red}{6} = 9 + \color{red}{1} \color{red}{ + } \color{red}{5} = 15\)
12. \(9 + \color{red}{11} = \color{red}{11} + 9 = 20\)