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

    Does the multiplication by 11 trick work for numbers that aren't two digits?

    Module 1 Day 3 Challenge Part 2
    2
    3
    34
    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.
    • aaronhmaA
      aaronhma M1★ M2★ M3★ M4★ M5★
      last edited by

      Does the multiplication by 11 trick work for numbers that aren't two digits? (eg. 123 * 11 - where do I write 6?)

      Professor Loh is the best mathematician and teacher

      1 Reply Last reply Reply Quote 2
      • 西瓜西
        西瓜 M0★ M1★ M2★ M3★ M4★ M5★
        last edited by 西瓜

        Yes.
        123x11=1353

        Explanation: The answer begins with 1 and ends with 3. Since 1+2 = 3 and 2+3 =5, you take out the 2 and "insert" the 3 and 5 to get 1353. Hope this made sense 🙂

        Hello, this is 西瓜.

        aaronhmaA 1 Reply Last reply Reply Quote 3
        • aaronhmaA
          aaronhma M1★ M2★ M3★ M4★ M5★ @西瓜
          last edited by

          @starwraith Thanks! 🙂

          Professor Loh is the best mathematician and teacher

          1 Reply Last reply Reply Quote 2

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