Login Register Sign up for the GRM e-newsletter

Login to post Forums » Off-topic discussion » 48÷2(9+3) = ?? « 7 8 9 10 11 12 »
  • 92CelicaHalfTrac

    April 14, 2011 2:05 p.m. 92CelicaHalfTrac SuperDork

    RossD wrote:

    RossD wrote:

    What is the answer to: 48÷2÷(9+3)

    Conversely: 48÷2*(9+3)

    The answer cannot be the same.

    Again, please.

    Gladly!

    2, and 288. I'm having trouble figuring out why either of these are relevant to the discussion, as neither of them are the original question, though the first one is close.

    Please answer my above questions, as i've been respectful enough to address yours. G'day!

  • RossD

    April 14, 2011 2:58 p.m. RossD Dork

    See that is the problem. The second equation [48÷2*(9+3)] is exactly the same as the original equation. Why else would you multiply 2 by (9+3) if that multiplication symbol isn't in the equation? The multiplication symbol is implied, and division and multiplication have the same rank in the PEMDAS system, so therefore you start from the left and go right and do exacty what is there. 48 divided by 2 multiplied by the quantity 9 add to 3. Equals 288.

    What questions have I been missing? I'll do my best to answer them.

    From wiki: "The standard order of operations, or precedence, is expressed here:

    terms inside brackets

    exponents and roots

    multiplication and division

    addition and subtraction "

    http://en.wikipedia.org/wiki/Order_of_operations

    Multiplication and division have the same rank; therefore you do them in order.

  • RossD

    April 14, 2011 3:02 p.m. RossD Dork

    From the Purple Math website

    http://www.purplemath.com/modules/orderops.htm

    "A common technique for remembering the order of operations is the abbreviation "PEMDAS", which is turned into the phrase "Please Excuse My Dear Aunt Sally". It stands for "Parentheses, Exponents, Multiplication and Division, and Addition and Subtraction". This tells you the ranks of the operations: Parentheses outrank exponents, which outrank multiplication and division (but multiplication and division are at the same rank), and these two outrank addition and subtraction (which are together on the bottom rank). When you have a bunch of operations of the same rank, you just operate from left to right. For instance, 15 ÷ 3 × 4 is not 15 ÷ 12, but is rather 5 × 4, because, going from left to right, you get to the division first."

  • nderwater

    April 14, 2011 3:25 p.m. nderwater HalfDork

    RossD wrote:

    48÷2÷(9+3) = 2

    48÷2*(9+3) = 288

    Which of those two statements reflects the orignal question: 48÷2(9+3) = ??

    The second. Think about what that means.

  • EastCoastMojo

    April 14, 2011 3:53 p.m. EastCoastMojo SuperDork

  • monark192

    April 14, 2011 4:38 p.m. monark192 Reader

    My wife is a special ed teacher - her kids got 288.

  • confuZion3

    April 14, 2011 11:18 p.m. confuZion3 SuperDork

    After using the distributive property and multiplying the 2 by the 9 and the 3 and then adding the two products; I divided that sum by 48 and got AIDS. Way to go guys. Now I have AIDS.

  • April 15, 2011 3:31 a.m. lewbud Reader

    So basically, I do it one way and get 2, do it the other and I get 288. My head still hurts and I'm wondering where my damn pancakes are.

  • Toyman01

    April 15, 2011 6:19 a.m. Toyman01 SuperDork

    I have nothing constructive to add but, 12 pages on a math problem. What a bunch of geeks.

  • Giant Purple Snorklewacker

    April 15, 2011 6:30 a.m. Giant Purple Snorklewacker SuperDork

    Toyman01 wrote:

    I have nothing constructive to add but, 12 pages on a math problem. What a bunch of geeks.

    Correction: 12 pages on a notation clarity problem.

    "Throw your father down the stairs his hat."

  • confuZion3

    April 15, 2011 12:02 p.m. confuZion3 SuperDork

    Giant Purple Snorklewacker wrote:

    Toyman01 wrote:

    I have nothing constructive to add but, 12 pages on a math problem. What a bunch of geeks.

    Correction: 12 pages on a notation clarity problem.

    "Throw your father down the stairs his hat."

    "Helping your uncle Jack off a horse."

  • 92CelicaHalfTrac

    April 15, 2011 12:18 p.m. 92CelicaHalfTrac SuperDork

    confuZion3 wrote:

    Giant Purple Snorklewacker wrote:

    Toyman01 wrote:

    I have nothing constructive to add but, 12 pages on a math problem. What a bunch of geeks.

    Correction: 12 pages on a notation clarity problem.

    "Throw your father down the stairs his hat."

    "Helping your uncle Jack off a horse."

    Do you smell.... like E36 M3?

« 7 8 9 10 11 12 »  
Tire Rack- Revolutionizing Tire Buying

You'll need to log in to post.