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

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Verbetersleutel

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