416
.... Fair (lemmy.dbzer0.com)
submitted 1 month ago by to c/funny@sh.itjust.works
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[–] 8 points 1 month ago* (last edited 1 month ago) (6 children)

$7.83

My method:

  • 42.17 + 8.00 = 50.17
  • 8 - 1 = 7
  • 0.17 - 0.02 = 0.15
  • 0.85 + 0.15 = 1.00
  • 0.85 - 0.02 = 0.83
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  • [–] 8 points 1 month ago (1 child)

    Jesus brother, what the hell

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  • [–] 2 points 1 month ago* (1 child)

    What's the problem with this method? I figure out tips through mental math, without any paper. This is just explaining how I do that mental math

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  • [–] 3 points 1 month ago*

    Mine:

    • ends in not 00, so add whatever makes the ones digit a 9 (7 in this case).
    • make the cents even -> .20 (add .03)
    • go to 100 (add .80)

    I think, anyway. I can mostly just look at it and know.

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  • [–] 2 points 1 month ago (1 child)

    This is how AIs do math

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