10 - 20

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

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Verbetersleutel

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