Use of applied mathematics during hiring process for developers

What qualities does this task helps to demonstrate?

  1. problem solving and ability to make a problem simpler but get the correct answer
  2. Ability to save several seconds by not running calculator program
  3. p
  4. algebra skills
  5. how frequently the person uses pure math
  6. recognising patterns
  7. 8
  8. arithmetic (or maybe, 'quickk calculation')
  9. don't know
  10. Don't know
  11. attention to detail? none, really. basic division, subtraction and counting digits.
  12. -
  13. Quick mental basic math operations
  14. same as above + how fast you are
  15. accuraccy
  16. Mental calculation :)
  17. Analytical skills
  18. Patterns in multiplication?
  19. arithmetic