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

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Verbetersleutel

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