Topics: Starter | Arithmetic | Mental Methods

• Transum,
•  
• The eleven times table has always been very easy to learn up to 9 x 11. Here's a way of multiplying large numbers by 11 too:
  Example:
  Q. What is 324 x 11 ?
  A. Write down the first digit ... 3
  .......Add the first and second digits ... 3 + 2 = 5
  .......Add the second and third digits .. 2 + 4 = 6
  .......Write down the last digit ........... 4
  The answer is 3564.
  Try it yourself ... multiply 543 by 11
  Do you know why it works?
  Does it work for all three digit numbers?
• Anna, Dorchester, St Birinus CE Primary
•  
• So what's the word?
  
  [Transum: Scroll down the page to see the answer]

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