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

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Verbetersleutel

1. \(9 + \color{red}{5} = 9 + \color{red}{1} \color{red}{ + } \color{red}{4} = 14\)
2. \(8 + \color{red}{7} = 8 + \color{red}{2} \color{red}{ + } \color{red}{5} = 15\)
3. \(6 + \color{red}{13} = \color{red}{13} + 6 = 19\)
4. \(3 + \color{red}{13} = \color{red}{13} + 3 = 16\)
5. \(2 + \color{red}{18} = \color{red}{18} + 2 = 20\)
6. \(4 + \color{red}{13} = \color{red}{13} + 4 = 17\)
7. \(6 + \color{red}{9} = 9 + \color{green}{6} = 9 + \color{green}{1 + 5} = 15\)
8. \(9 + \color{red}{10} = \color{red}{10} + 9 = 19\)
9. \(5 + \color{red}{15} = \color{red}{15} + 5 = 20\)
10. \(2 + \color{red}{10} = \color{red}{10} + 2 = 12\)
11. \(2 + \color{red}{15} = \color{red}{15} + 2 = 17\)
12. \(4 + \color{red}{15} = \color{red}{15} + 4 = 19\)