Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

Math trick needed

  1. Jul 23, 2004 #1
    any body know that trick where you tell the audience to pick a number and thell them to add a number and multiply by a number and then after a couple of sets everybody will have a common answer? If so could you please explain in detail regarding the procedure.
  2. jcsd
  3. Jul 23, 2004 #2
  4. Jul 25, 2004 #3
    1) Pick a number between 1 and 10
    2) multiply that number by 9
    3) if the number is two digets, add the two digits together
    4) subtract 5 from the answer.
    5) if 1 = A, 2 = B, 3 = C, 4 = D, 5 = E, etc... think of a country with the letter your number represents.
    5) Using the last letter of the country, think of an animal.

    This is an example lol... steps 4 onwards aren't needed but amazingly, most people choose Denmark, and Kangaroo.
  5. Jul 25, 2004 #4
    There are a bunch of those (3-4) in 'Mathematical Recreations and Essays' by Ball & Coxeter. That book is packed with all kinds of cool stuff.
Share this great discussion with others via Reddit, Google+, Twitter, or Facebook