10 - 20

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

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Verbetersleutel

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