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

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Verbetersleutel

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