Forum — Daily Challenge
    • Categories
    • Recent
    • Tags
    • Popular
    • Users
    • Groups
    • Login

    Should I always use the "Casting out 9's" trick?

    Module 5 Day 2 Challenge Part 4
    2
    2
    31
    Loading More Posts
    • Oldest to Newest
    • Newest to Oldest
    • Most Votes
    Reply
    • Reply as topic
    Log in to reply
    This topic has been deleted. Only users with topic management privileges can see it.
    • P
      professionalbronco M0★ M1★ M2★ M3 M5★
      last edited by

      See the title.

      The Daily Challenge with Po-Shen Loh is the best!
      aops user = captainnobody

      quacker88Q 1 Reply Last reply Reply Quote 1
      • quacker88Q
        quacker88 MOD @professionalbronco
        last edited by quacker88

        @professionalbronco Yeah! This trick makes finding remainders when dividing by 9 really fast. It's not too common that a problem will require you to find a number \(\pmod{9}\), but it's definitely very useful for this specific case.

        1 Reply Last reply Reply Quote 1

        • 1 / 1
        • First post
          Last post
        Daily Challenge | Terms | COPPA