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(Some Guy)   6/2(1+2) = 9 no no, 6/2(1+2) = 1 no no, 6/2(1+2) = 2   ( mathmagical.co.uk) divider line
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30236 clicks; posted to Main » on 30 Mar 2012 at 9:56 AM (6 years ago)   |   Favorite    |   share:  Share on Twitter share via Email Share on Facebook   more»



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2012-03-30 10:28:23 AM  

optikeye: Conventions have changed..and a poorly presented equation is open to interpretations.


What poorly presented equation?
 
2012-03-30 10:28:40 AM  

Geeves00: Those of you saying 1.....You realize the parentheses don't go away once you complete the operation inside right?

6/2(1+2)
6/2(3)
3(3)
=9


At least that was how I was always taught it. You keep the parentheses to insure the order is being followed (it helped those kids who assumed Multiplication was done before division for some reason)
 
2012-03-30 10:29:48 AM  
I got 42.
 
2012-03-30 10:29:50 AM  
Anyone who gets anything other than 9 out of that is flippin' mongoloid.
 
2012-03-30 10:29:57 AM  
9
 
2012-03-30 10:29:57 AM  
SOHCAHTOA
 
2012-03-30 10:30:00 AM  

trappedspirit: optikeye: Conventions have changed..and a poorly presented equation is open to interpretations.

What poorly presented equation?


Exactly. The only people who think this is poorly represented don't understand math.
 
2012-03-30 10:30:21 AM  

dittybopper: Walker: farkingismybusiness: I was told there would be no math.

THIS! I hate math!

/maths for those in the UK, Australia, etc.

Poor you. The Universe, and everything in it, is math. Even yourself. All of your actions, thoughts, emotions, everything you see, hear, touch, taste, and experience is math. Everything that you are and do is, at some basic and fundamental level, governed my mathematical principles.

All of it.


Without lamps, there'd be no light.
 
2012-03-30 10:30:37 AM  

Meet Us at the Stick: optikeye: a poorly presented equation is open to interpretations.

As it's written in the headline it's not poorly presented at all

6/2(1+2)

Order of Operation says perform the operation in parentheses first

6/2(3)

Now since the only operations left are division and multiplication, perform those from left to right

6/2 = 3

So we are left with

3(3) = 9

It couldn't be more clear.


This.
 
2012-03-30 10:32:08 AM  
80085
 
2012-03-30 10:32:50 AM  

sxacho: 5318008 erom


ftfm.
 
2012-03-30 10:33:10 AM  

kaduh: 80085


5318008
 
2012-03-30 10:33:14 AM  
Relevant!

img198.imageshack.usView Full Size
 
2012-03-30 10:33:18 AM  
On my iphone, if you punch it in without the implied '*', then hit =, the result shown is '2'. Am not sure wtf is going on with this. If you then continue hitting '=' the result increments by 3 each time.

Punch it in with the implied '*' and you do get the right answer - 9.
 
2012-03-30 10:34:36 AM  

Harry Freakstorm: According to my calculator, the answer is Lo Bat


No that means it's too hard for your calculator to calculate and it's suggesting you consult the world's authority on simple math, The Chinese mathematician Lo Bat. Actually that's how you can tell your calculator was made for the English speaking market. The Chinese models will say Bat Lo.
 
2012-03-30 10:35:37 AM  

kaduh: 80085


Woah there. Don't just post that with no warning. That's NSFW
 
2012-03-30 10:36:02 AM  

Louisiana_Sitar_Club: Anyone who gets anything other than 9 out of that is flippin' mongoloid.


That's racist. The proper term is "fivehead", "shortbus" or "Jenny".
 
2012-03-30 10:36:18 AM  

flaminio: brainlordmesomorph: Sock Ruh Tease: I hope you enjoy typing 6÷2(1+2)= into your calculator and seeing what you get.

There are people who might enjoy that?

Yep.
my droid gets it right :)

Mine too. Realcalc rulez.


No. Rulez rule:

i39.tinypic.comView Full Size


/Let's see if your droid is still working 40+ years after it was manufactured.
 
2012-03-30 10:36:51 AM  
Well, I came up with nine as my answer, but I WAS TOLD THERE WOULD BE NO MATH!
 
2012-03-30 10:36:54 AM  

RexTalionis: Meet Us at the Stick: optikeye: a poorly presented equation is open to interpretations.

As it's written in the headline it's not poorly presented at all

6/2(1+2)

Order of Operation says perform the operation in parentheses first

6/2(3)

Now since the only operations left are division and multiplication, perform those from left to right

6/2 = 3

So we are left with

3(3) = 9

It couldn't be more clear.

Okay, I see we're done here.


Morans..... Even my stupid Droid phone calculator gave me the right answer.
 
2012-03-30 10:37:02 AM  

impaler: Lsherm: impaler: Order of operation means
6/2*3 = 9
6/(2*3) = 1

No.

Take a math course sometime moron.


I'm not the one adding a phantom set of parentheses - you are. Multiplication and division have the same priority in PEMDAS, so it's (P) (E) (MD) (AS). Anything with the same priority gets evaluated left to right. You are evaluating the multiplication 2*3 FIRST (on the right) then evaluating the division on the left. You're doing it backwards because you've inexplicably added a second set of parentheses to justify your answer. Your answer is only correct if the original equation was written as such:

6/(2(1+2))

I bolded the extra parentheses you included in your own post. I did that because it's difficult for idiots to see where they went wrong if you don't spell it out for them.
 
2012-03-30 10:37:16 AM  

Huck Chaser: You guys are missing the real point here, which is that if the iPhone says it's 2, it's 2.


My TI-36X says "2" too, if you don't enter the * before the (). I think that when you enter the ( after the 2, it tosses out the 2 completely so that the statement becomes 6/(1+2). So the error is in how one uses the calculator.
 
2012-03-30 10:37:26 AM  

wjllope: A friend was telling me about his adventure at the post office yesterday. He wants to mail many tens of wedding invitations. The young girl at the counter takes one envelope and puts it on the scale and says she can't mail it because it weighs as zero on the scale, so she can't calculate the postage. Something like that...
It took my friend more than ten minutes to carefully explain why she could measure 10 envelopes at the same time, then just divide that result by ten. At some point she even called the Postmaster over. Eventually, she understood, and the letters got mailed. She was even gushing "that is soo coool - I get it now!!"



I went to Waffle House with a friend for Breakfast one morning and we ordered the same exact thing, when we told the waitress we wanted separate checks she divided them out and they were different amounts she even exclaimed to her coworker that every time she did that the numbers were different.
 
2012-03-30 10:37:46 AM  
Why does it matter whether you do multiplication/division left to right or right to left?
 
2012-03-30 10:38:04 AM  

Meet Us at the Stick: optikeye: a poorly presented equation is open to interpretations.

As it's written in the headline it's not poorly presented at all

6/2(1+2)

Order of Operation says perform the operation in parentheses first

6/2(3)

Now since the only operations left are division and multiplication, perform those from left to right

6/2 = 3

So we are left with

3(3) = 9

It couldn't be more clear.


I concur
 
2012-03-30 10:38:41 AM  

res ipsa dixit: Why does it matter whether you do multiplication/division left to right or right to left?


This thread shows exactly why it matters.
 
2012-03-30 10:38:53 AM  

res ipsa dixit: Why does it matter whether you do multiplication/division left to right or right to left?


Because you get different answers.
 
2012-03-30 10:39:09 AM  

Meet Us at the Stick: optikeye: a poorly presented equation is open to interpretations.

As it's written in the headline it's not poorly presented at all

6/2(1+2)

Order of Operation says perform the operation in parentheses first

6/2(3)

Now since the only operations left are division and multiplication, perform those from left to right

6/2 = 3

So we are left with

3(3) = 9

It couldn't be more clear.


Except for the Distributive Property which changes the way parens are treated when there is a number preceding, with no sign.

I can see exactly how the discrepancy is happening, and I am not sure of the correct solution, which is the same reason actual mathematicians, and not Fark commenters, could not come to a consensus. "It couldn't be more clear." Bah.
 
2012-03-30 10:39:46 AM  
Aunt Sally....what a biatch
 
2012-03-30 10:39:52 AM  

adp1215: Meet Us at the Stick: optikeye: a poorly presented equation is open to interpretations.

As it's written in the headline it's not poorly presented at all

6/2(1+2)

Order of Operation says perform the operation in parentheses first

6/2(3)

Now since the only operations left are division and multiplication, perform those from left to right

6/2 = 3

So we are left with

3(3) = 9

It couldn't be more clear.

I concur



Wait, wait, wait are we doing this is Base 10 or Base 8?

/New Math
 
2012-03-30 10:40:11 AM  

no icon tact: RPN FTW WTF


YFTF.
 
2012-03-30 10:40:37 AM  
I was under the impression that multiplication took precedence over division in programing languages (hence the outcome of 1)

Because the 2() implies the * operator, I am guessing that it "converts" it behind the scenes and follows precedence according to its language rules.

Goes to show, its always best to be explicit.
 
2012-03-30 10:40:49 AM  
Having spent years programming in Perl, this does not in any way shock or amaze me. I learned the hard way long, long, long ago to be very clear and very explicit in defining any even slightly complex mathematical operation for any computer at all.
 
2012-03-30 10:41:37 AM  
The answer is 9, and both calculators on my Android get the answer right.

/The one that came preloaded and the scientific calculator I installed
 
2012-03-30 10:42:02 AM  
Troll Math: 48÷2(9+3) = 2 or 288?

i42.tinypic.comView Full Size


/* Nothing new - ambiguously written equations have been trolling people for quite a while. */
// Slashie comments!
 
2012-03-30 10:42:24 AM  
Is our children learning?

Correct answer is 9, if you are answering 1 you need to be sent the the remedial math center.

/in Siberia
 
2012-03-30 10:42:39 AM  
Using an implied multiplication with a number adjacent to a left bracket is sloppy and annoys me (engineer).

///Always write out the implied function.
 
2012-03-30 10:43:11 AM  
Zizzowop
dittybopper: Walker: farkingismybusiness: I was told there would be no math.

THIS! I hate math!

/maths for those in the UK, Australia, etc.

Poor you. The Universe, and everything in it, is math. Even yourself. All of your actions, thoughts, emotions, everything you see, hear, touch, taste, and experience is math. Everything that you are and do is, at some basic and fundamental level, governed my mathematical principles.

All of it.

Without lamps, there'd be no light.


blogcdn.comView Full Size
 
2012-03-30 10:43:13 AM  

Tax Boy: [i1-mac.softpedia-static.com image 629x449]

RPN, biatches

/parentheses are for losers


Dude, your calculator sucks, RPN or not. How the hell did you get 122,336 from "6/2(1+2)". The problem doesn't even involve x/y coordinates.
 
2012-03-30 10:43:20 AM  

GORDON: Except for the Distributive Property which changes the way parens are treated when there is a number preceding, with no sign.

I can see exactly how the discrepancy is happening, and I am not sure of the correct solution, which is the same reason actual mathematicians, and not Fark commenters, could not come to a consensus. "It couldn't be more clear." Bah.


You obviously know nothing about the math or mathematicians. Meet Us at the Stick is absolutely correct. All mathematicians agree you don't know what you're talking about.
 
2012-03-30 10:43:25 AM  

impaler: Order of operation means
6/2*3 = 9
6/(2*3) = 1


Nope. Multiplication doesn't have priority over division. It can't: division is, axiomatically, multiplication by a reciprocal.

/PE[MD][AS]
 
2012-03-30 10:43:31 AM  
ok, so we cleared up that the answer is 9 and how 1 was perceived as the answer. how the heck did the iphone get 2?
 
2012-03-30 10:43:54 AM  
1.bp.blogspot.comView Full Size
 
2012-03-30 10:43:58 AM  

res ipsa dixit: Why does it matter whether you do multiplication/division left to right or right to left?


Because if a standard evaluation process is not defined, expressions can't be consistently evaluated, and transferring mathematical knowledge between people becomes impossible.
 
2012-03-30 10:44:10 AM  
Calculator computation on the left is fake - that equation was entered after previously computing an answer of 1. Link (new window)
 
2012-03-30 10:44:22 AM  

impaler: Lsherm: impaler: Order of operation means
6/2*3 = 9
6/(2*3) = 1

No.

Take a math course sometime moron.


Maybe he thought you meant that the answer is 1 and the brackets are implied? I'm pretty confused.
 
2012-03-30 10:44:26 AM  
Apparently, just taking PEMDAS at face value is wrong. I couldn't remember if division or multiplication was supposed to go first, so I had to look it up. Division should be treated as multiplication of the reciprocal, and subtraction as addition of the inverse. Therefore, it's parentheses, multiplication from left to right, addition from left to right.

Weird that the iPhone can't do an implied multiplication.
 
2012-03-30 10:44:58 AM  
since all of you are too lazy to google... from TI's website:

Does implied multiplication and explicit multiplication have the same precedence on TI graphing calculators?

Implied multiplication has a higher priority than explicit multiplication to allow users to enter expressions, in the same manner as they would be written. For example, the TI-80, TI-81, TI-82, and TI-85 evaluate 1/2X as 1/(2*X), while other products may evaluate the same expression as 1/2*X from left to right. Without this feature, it would be necessary to group 2X in parentheses, something that is typically not done when writing the expression on paper.

This order of precedence was changed for the TI-83 family, TI-84 Plus family, TI-89 family, TI-92 Plus, Voyage™ 200 and the TI-Nspire™ Handheld in TI-84 Plus Mode. Implied and explicit multiplication is given the same priority.
 
2012-03-30 10:45:33 AM  

Mearen: SurfaceTension: 6/2(3) is really:

  6  
----- (3)
  2  

which is 9.

The way it's written is 6/ 2*3 = 1. There's no space after the 2 so it's not written as 6 halves.


notsureifserious.jpg
 
2012-03-30 10:45:36 AM  

dittybopper: no icon tact: RPN FTW WTF TFW

YFTF.


TFFY
 
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