10 - 20

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

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Verbetersleutel

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