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

Reken uit

Verbetersleutel

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