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

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Verbetersleutel

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