Results 1 to 4 of 4

Thread: What is the order of operation in this equation

  1. #1
    Newbie
    Joined
    Aug 2012
    From
    England
    Posts
    2

    Question What is the order of operation in this equation

    32 - 4 x 2 x (-1)

    I know the answer is 17 but I dont know how to work this out without a calculator

    Please help
    Follow Math Help Forum on Facebook and Google+

  2. #2
    MHF Contributor
    Prove It's Avatar
    Joined
    Aug 2008
    Posts
    12,711
    Thanks
    1881

    Re: What is the order of operation in this equation

    Do you know BODMAS? Brackets, (Powers) Of, Division, Multiplication, Addition, Subtraction?

    First evaluate anything in brackets (there aren't any), then any powers, then any multiplications and divisions (from left to right), and finally any additions and subtractions (from left to right).
    Follow Math Help Forum on Facebook and Google+

  3. #3
    MHF Contributor

    Joined
    Apr 2005
    Posts
    18,434
    Thanks
    2528

    Re: What is the order of operation in this equation

    I prefer "Please Excuse My Dear Aunt Sally" or "PEMDAS": first do what is inside parentheses (or brackets or any "grouping" symbols), then exponents such as 3^2, then multiplications and divisions (the order of those is not important) finally additions and subtractions. For your problem, calculate 3^2= 9 and the product (4)(2)(-1)= -8 and finally do the subtraction: 9- (-8)= 9+ 8.
    Follow Math Help Forum on Facebook and Google+

  4. #4
    MHF Contributor
    Prove It's Avatar
    Joined
    Aug 2008
    Posts
    12,711
    Thanks
    1881

    Re: What is the order of operation in this equation

    Quote Originally Posted by HallsofIvy View Post
    I prefer "Please Excuse My Dear Aunt Sally" or "PEMDAS": first do what is inside parentheses (or brackets or any "grouping" symbols), then exponents such as 3^2, then multiplications and divisions (the order of those is not important) finally additions and subtractions. For your problem, calculate 3^2= 9 and the product (4)(2)(-1)= -8 and finally do the subtraction: 9- (-8)= 9+ 8.
    The order of the multiplications and divisions, and the additions and subtractions IS important. Even though multiplication and division have equal power, you still need to work LEFT TO RIGHT. Same with the additions and subtractions.
    Follow Math Help Forum on Facebook and Google+

Similar Math Help Forum Discussions

  1. 7 order equation
    Posted in the Advanced Algebra Forum
    Replies: 0
    Last Post: Apr 21st 2012, 03:16 AM
  2. Replies: 2
    Last Post: Sep 21st 2011, 04:37 PM
  3. Order of Operation for Set Notation
    Posted in the Discrete Math Forum
    Replies: 2
    Last Post: Feb 3rd 2010, 07:03 AM
  4. Replies: 2
    Last Post: Nov 25th 2008, 10:29 PM
  5. order of operation
    Posted in the Algebra Forum
    Replies: 2
    Last Post: Nov 29th 2006, 01:11 PM

Search Tags


/mathhelpforum @mathhelpforum