• @[email protected]
    link
    fedilink
    1
    edit-2
    11 months ago

    27943 - 7*1000 = 20943

    20943 -7*3*1000 = 20943 - 21000 = -57

    -57 is not divisible by 7 therefore 27943 is not divisible by 7.

    • @[email protected]
      link
      fedilink
      English
      111 months ago

      The other posters algorithm was better, but I was exaggerating - ultimately my point is you have to math it out