12 / 4 x 3

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Firellius

Senior Member

08-21-2012

Quote:
Originally Posted by End of Shadows View Post
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:
Originally Posted by Light LaserTower View Post
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:
Originally Posted by Firellius View Post
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:
Originally Posted by Firellius View Post
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:
Originally Posted by Ur little sister View Post
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

This user has referred a friend to League of Legends, click for more information

Senior Member

08-21-2012

Quote:
Originally Posted by DirtyAardvark View Post
>> 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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