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Math Help - BODMAS versus BOMDAS

  1. #1
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    BODMAS versus BOMDAS

    At my age I was taught using The Brackets,Other,Multiply,Divide, Add, Subtract protocol
    hence 600/5*2=60

    Today students are taught using The Brackets,Other,Divide, Multiply,Add, Subtract protocol
    hence 600/5*2=240

    When was BODMAS introduced and what was the reason for the change?

    berniecole
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  2. #2
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    I was always taught PEMDAS and I'm 22.

    Parrens, exponents, multi, div, add, sub.

    PEMDAS was short for "Please Excuse My Dear Aunt Sally"
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  3. #3
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    Just like chb, I also use PEMDAS.

    To avoid any confusions, always enclose calculations you fear someone might apply a different protocol in parenthesis.

    EDIT: In textbooks, it should be clear what to do first, since the format is usually like this:
    \frac{600}{5} \cdot 2

    or

    \frac{600}{5\cdot2}
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  4. #4
    Forum Admin topsquark's Avatar
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    Better check these sites. BODMAS and PEDMAS say exactly the same thing.
    600/5*2 = 120*2 = 240
    in both cases.

    -Dan
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  5. #5
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    Quote Originally Posted by topsquark View Post
    Better check these sites. BODMAS and PEDMAS say exactly the same thing.
    600/5*2 = 120*2 = 240
    in both cases.

    -Dan
    Hey Dan,
    I believe he was talking about BODMAS and BOMDAS.

    EDIT: My apologies. The titles for links were misleading
    Last edited by Chop Suey; July 10th 2008 at 09:27 AM.
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  6. #6
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    Bodmas versus Bomdas

    Quote Originally Posted by Chop Suey View Post
    Just like chb, I also use PEMDAS.

    To avoid any confusions, always enclose calculations you fear someone might apply a different protocol in parenthesis.

    EDIT: In textbooks, it should be clear what to do first, since the format is usually like this:
    \frac{600}{5} \cdot 2

    or

    \frac{600}{5\cdot2}
    I assummed that acording to PEMDAS multiplication had greater precedence than division and hence 600/5*2=60. However when doing a Spreadsheet calculation it is stated that multiplication and division have equeal precedence and the calcultion is read from left to right hence the confusion, 600/5*2=240. when did PEDMAS or BODMAS come into being?

    I usually aviod the confusion by peppering my equations with prenthesis

    Your comments would be appreciated
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  7. #7
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    Multiplication and divison have equal precedence. The problem is the confusion in your example:
    600/5*2

    Since you used a backslash to indicate division, the usual approach would be to assume that 600/5 is a separate fraction multiplied by 2.
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  8. #8
    Forum Admin topsquark's Avatar
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    Quote Originally Posted by berniecole View Post
    I assummed that acording to PEMDAS multiplication had greater precedence than division and hence 600/5*2=60. However when doing a Spreadsheet calculation it is stated that multiplication and division have equeal precedence and the calcultion is read from left to right hence the confusion, 600/5*2=240. when did PEDMAS or BODMAS come into being?

    I usually aviod the confusion by peppering my equations with prenthesis

    Your comments would be appreciated
    If you look at the site links I provided it states that multiplication and division have equal precedence, so if there is any question between the order of the two then the expression reads left to right. So
    600/5*2
    reads
    (600/5)*2

    -Dan
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  9. #9
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    I've always been taught PEMDAS, and have always used it. I actually had never heard of BODMAS until I joined this forum.
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  10. #10
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    Bodmas Vs Bomdas

    Well I remember learing BODMAS too but I've heard of BIDMAS as well (Brackets, INDICES, Division, Multiplication,Addition and Subtraction)

    Hmm wow I never new about the other one anyway just stick to what you learnt That's what i do
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  11. #11
    Super Member Matt Westwood's Avatar
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    We were given BOMDAS as well at kiddie-school, I always wondered about the "O" which was given to us as "Of" .

    It was ingrained in us that the MD were interpreted left to right and the AS bit was also interpreted in the same way, as - and + are also at equal precedence.

    Later on when I went to big school we were told BEDMAS, where, indeed, the E is for exponentiation, making the mnemonic complete.

    If you seriously don't want confusion, then always write judicious brackets. Alternatively, use a leftfix or rightfix (a.k.a. Polish or Reverse Polish) notation.
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  12. #12
    Senior Member euclid2's Avatar
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    I was taught BEDMAS (brackets, exponents, division, multiplication, addition, subtraction)
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