Page 1 of 4 1234 LastLast
Results 1 to 9 of 33

Thread: Attention mathematicians: Help

Hybrid View

  1. #1

    Default Attention mathematicians: Help

    Interesting debate on physics.com

    What's your the answer?

    48/2(9+3)

  2. #2

    Default Re: Attention mathematicians: Help

    I will make my guess as 288. I'm sure it's much more complicated than that though. But, hey, I did get a C+ in trigonometery back in the day.

  3. #3

    Default Re: Attention mathematicians: Help

    Has to be 288.
    To avoid criticism say nothing, do nothing, be nothing.

  4. #4
    Administrator Gold's Avatar
    Join Date
    Jan 2008
    Location
    Cambridge, OH
    Posts
    5,188

    Default Re: Attention mathematicians: Help

    288 fo sho...


  5. #5
    NCAA Champ WhippetGrappler's Avatar
    Join Date
    Jan 2008
    Location
    Moved to Suffolk, VA
    Posts
    1,281

    Default Re: Attention mathematicians: Help

    This could be 2 different answers depending on how you see it.

    48
    --- (9+3) = 288
    2

    However if you see if as:

    48
    ---------- = 2
    2 (9+3)

    hard to tell which way it is expressing it.
    BRUTUS BUCKEYE WILL TAKE YOU DOWN...

  6. #6

    Default Re: Attention mathematicians: Help

    PEDMAS is the order of operation. Parentheses, Exponents, Division, Multiplication, Addition, Subtraction. 48/2(9+3) becomes 48/2(12). Next step is division (there are no exponents) so our problem becomes 24(12). The last step (for this problem) is the multiplication, so the answer is 288.
    Jeez, guys, it's only been 45 years since high school algebra. It seems like it was just yesterday. Of course, I can't remember what I had for breakfast . . . .

    R.I.P. Cyrano and Roxanne.

  7. #7

    Default Re: Attention mathematicians: Help

    Hi M Richardson.

    Regarding PEDMAS, isn't it actually parenthethis, exponents, then (moving left to right in arrival sequence) multiplication or division then (moving left to right in arrival sequence) addition or subtraction.

    Since multiplication and division are at the same level and addition and subtraction are at the same (but lower) level, PEDMAS could be PEDMSA or PEMDAS or PEMDSA?

  8. #8

    Default Re: Attention mathematicians: Help

    Quote Originally Posted by WhippetGrappler View Post
    This could be 2 different answers depending on how you see it.

    48
    --- (9+3) = 288
    2

    However if you see if as:

    48
    ---------- = 2
    2 (9+3)

    hard to tell which way it is expressing it.
    You are on the right track. Maybe in Ohio we did things different. I never heard of Pedmas while attending Cleveland Schools. Or if I had heard of it, I immediately forgot it, maybe considering it as something superfluous.

    Your:
    48
    --- (9+3) = 288
    2

    May also be expressed as

    48 (9+3)
    --- = 288
    2

    I know I did that type of simplification countless times.

    ================================

    Taking the problem at hand, lets switch 48/2(9+3) to 48(9+3)/2.

    According to the presented PEDMAS procedure, 48(9+3)/2 becomes 48(12)/2. Next step is division (there are no exponents) so our problem becomes 48(6). The last step (for this problem) is the multiplication, so the answer is 288.

    Question: how can 48/2(9+3) and 48(9+3)/2 both be equal to 288?

    Answer: because the (9+3) is consider part of the dividend in both division problems.

    Real question:

    If it is my intent that the (9+3) be part of the DIVISOR how do I express that so that a quotient of 2 becomes the correct answer? We already see that whppetgrappler has shown it with his second expression.

    I know that I would have
    48/2(9+3)=2
    and 48/2*(9+3)=288

    I know that simplification was one of my key tasks in math. Is Pedmas something that occurs AFTER simplification of divisors and dividends?
    DSCH: a Soviet artist's reply to unjust criticism.

  9. #9

    Default Re: Attention mathematicians: Help

    You'll all nerds.
    Quote Originally Posted by Flop The Nuts View Post
    [D]on't let lack of knowledge impact your ability to post as if you are knowledgeable.

Tags for this Thread

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •