Please turn on javascript in your browser to play chess.
Posers and Puzzles

Posers and Puzzles

  1. 14 Jan '05 03:41
    did you know that

    111111111 X 111111111 = 12345678987654320

    i thought i was kinda interesting.

    PS i not sure if it belongs here but it didnt seem like it should go in the general fourm so i put it here
  2. Subscriber BigDoggProblem
    The Advanced Mind
    14 Jan '05 05:37
    Originally posted by UncleAdam
    did you know that

    111111111 X 111111111 = 12345678987654320

    i thought i was kinda interesting.

    PS i not sure if it belongs here but it didnt seem like it should go in the general fourm so i put it here
    It's a pretty straightforward calculation. If you think of multiplying by hand, you'll end up adding stacks of ones. Each stack will have progressively more ones until the center, which has 9 (the number of ones in your two original numbers) and so you'll see that pattern.
  3. Standard member Palynka
    Upward Spiral
    14 Jan '05 15:01
    Originally posted by UncleAdam
    did you know that

    111111111 X 111111111 = 12345678987654320

    i thought i was kinda interesting.

    PS i not sure if it belongs here but it didnt seem like it should go in the general fourm so i put it here
    You've made a typo, probably, as it should be 12345678987654321.
  4. 14 Jan '05 20:58
    Originally posted by Palynka
    You've made a typo, probably, as it should be 12345678987654321.
    nope, thats the way it came out on the calculator.
  5. Standard member neight
    Cheese log/Beef log
    14 Jan '05 21:49 / 1 edit
    Originally posted by UncleAdam
    nope, thats the way it came out on the calculator.
    Then your calculator's defective. You need prime factors of 5 and 2 for a non-trivial number to end in 0, and 111,111,111 does not have either factor. The correct product is indeed 12345678987654321
  6. Subscriber BigDoggProblem
    The Advanced Mind
    15 Jan '05 02:52
    Originally posted by UncleAdam
    nope, thats the way it came out on the calculator.
    I wouldn't rush to call the calculator defective, but it certainly may not be precise enough to display such a large number correctly.

    My Microsoft Excel gives 12345678987654300 as the answer. The last two digits are suspect when the question was 111111111 * 111111111.

    The ancient art of handwritten math (!) would quickly show you that your calculator is not telling the full story:

    111111111
    x 111111111
    -------------
    111111111
    1111111110 ... STOP

    Every line after this will have at least one placeholder zero, so the least significant digit will remain 1!
  7. Standard member TheMaster37
    Kupikupopo!
    15 Jan '05 13:45
    *cough* something ending in a 1 multiplied with something ending in a 1 ends in a 1. It's as simple as that
  8. Standard member The Plumber
    Leak-Proof
    18 Jan '05 00:54
    Originally posted by TheMaster37
    *cough* something ending in a 1 multiplied with something ending in a 1 ends in a 1. It's as simple as that
    I agree with you, but apparently Bill Gates disagrees, as Excel does give the answer of: 12345678987654300. I was tuaght in school that any number ending 1 times any number ending in 1 gave a product ending in 1. But Bill Gates must be right - he couldn't possibly have gotten so stinking rich by being wrong... ..could he?
  9. Standard member TheMaster37
    Kupikupopo!
    18 Jan '05 12:05
    Originally posted by The Plumber
    he couldn't possibly have gotten so stinking rich by being wrong... ..could he?
    Of course he can!
  10. Standard member The Plumber
    Leak-Proof
    18 Jan '05 19:20
    Originally posted by TheMaster37
    Of course he can!
    That must explain why I'm not rich.......
  11. 30 Jan '05 17:35
    hey master37, where did you get a picture of a moogle from?????? its cool and i want one.
  12. 02 Feb '05 13:06
    Originally posted by red king richie128
    hey master37, where did you get a picture of a moogle from?????? its cool and i want one.
    right click on the picture and display properties..........