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Which one is right?

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  • DubiousDan

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    math.PNG
    DK Firearms
     

    BigBoss0311

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    both. the one on the right is a scientific/programming calculator and will use a different order of operations. Google "chain input" or "calculator input methods" and be prepared to hate math even more.
     

    Dawico

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    both. the one on the right is a scientific/programming calculator and will use a different order of operations. Google "chain input" or "calculator input methods" and be prepared to hate math even more.
    Why would it use a different order of operations? There is only one.

    I used to think the answer on the right was correct until I read up on it.
     

    easy rider

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    Technically the one on the left is correct.

    Inside the parentheses is first, but once done inside the parentheses they become a standard multiplication sign. 6÷2×3, left to right, equals 9.
    Correct!

    Doesn't matter how long an equation is, parentheses are done first. The calculator on the right is using the parentheses as a division and that is wrong, should be multiplying.
     
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    BigBoss0311

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    again, they are both correct. it wouldn't spit that out as an answer if it wasn't right. dawico is correct in that if you follow the order of operations, since mulitplication and division are the same precedence in the order of operations, they are solved left to right. However, if you have a scientific/programming calculator its setting may be set to complete everything ignoring the order of operations, or some other way entirely. while PEMDAS/PEMA/BODMAS/BEDMAS/BIDMAS are all technically the same, it is not set in stone.
     
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    Dawico

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    Correct!

    Doesn't matter how long an equation is, parentheses are done first. The calculator on the right is using the parentheses as a division and that is wrong, should be multiplying.
    No it isn't. It is just multiplying the outside of the parenthesis instead of working left to right.
     

    Bozz10mm

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    Remembering from my high school algebra, and if you didn't have a calculator (which we didn't back then), only the one on the left is correct.

    The one on the right can not possibly be correct, because that is not how algebra is done.
     

    robertc1024

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    Somehow, the order of precedence got changed. Used to be powers, parentheses, multiplication, division, addition, subtraction. In which case, the one on the left is correct, but left to right, the one on the right is correct. We should all just go back to RPN (Reverse Polish Notation) like the old HP calculators with a stack. It's more efficient anyway.
     

    AustinN4

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    Inside the parentheses is first, but once done inside the parentheses they become a standard multiplication sign. 6÷2×3, left to right, equals 9.
    Anyone that needs a calculator to solve that problem needs to go back to the 5th grade.
     
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