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12 / 4 x 3

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Firellius

Senior Member

08-21-2012

Quote:
End of Shadows:
PEMDAS
Parentheses
Exponent
Multiplication OR Division
Addition OR Subtraction

The ones on the same line are just different forms of the same equation 1/4=1x.25



Which is why PEMDAS is misleading and should be PEMA or PEDS.


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Light LaserTower

Senior Member

08-21-2012

How is this under forum games..... these mods man....


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Firellius

Senior Member

08-21-2012

Quote:
Light LaserTower:
How is this under forum games..... these mods man....


I know right?

This is totally mind games, not forum games!


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End of Shadows

Senior Member

08-21-2012

Quote:
Firellius:
Which is why PEMDAS is misleading and should be PEMA or PEDS.

Its only misleading on such a basic level that your 5th grade teacher should have engrained it in you with a dozen of these type of problems, my 9 year old sister got this right, people have posted calculation sites that engineering companies will blindly follow, hell I can take a picture of my calculator giving the exact problem and it will be -9


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Ur little sister

Senior Member

08-21-2012

Quote:
Firellius:
I know it sounds off, but I'm referring to the actual action taken.

Multiplication and Division are one another's inverses.

Multiplication by X is Division by 1/X.

Therefor you do not put Multiplication before Division, because they can be substituted.


This is true.
It's also why this "LEFT TO RIGHT" bull**** is dodgy.
And it's the reason that nobody will EVER write down 12 / 4 * 3, because how you interpret that is PURELY convention of writing. Nobody will write it down like that when doing decent math; because it's up for interpretation.

Witten, people will use fractions, putting the *3 where it belongs in the fraction. On a computer, where you type in a line and don't really have fractions, the convention is that the 3 will be put in the numerator. However, most people will still write down (12*3) /
4 or something similar, just because 12/4*3 is silly and difficult to interpret.

I first found out about this when seeing something like 12 / 4 / 3 in an excell document, which equates to 12 / (4*3) = 1.


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Firellius

Senior Member

08-21-2012

Quote:
Ur little sister:
This is true.
It's also why this "LEFT TO RIGHT" bull**** is dodgy.


Without left to right, you'd have to put parenthesis EVERYWHERE.

Or it would be a matter of preference in which case all mathematics will collapse.


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Joseph Dom

Senior Member

08-21-2012

Quote:
DirtyAardvark:
>> 12/4*(1-4)

ans =

-9

Matlab wins


This reminds me of how much I hate Matlab. Just the name brings back memories of broken code and unknown errors.


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Astraltar

Senior Member

08-21-2012

Answer is 9

Also, that guy said "multiplication is division" because, in order of operations, neither of them has priority over the other. You do them from left to right.

Also, dividing by 2 is technically multiplying by .5.


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