Go Back   English Forum Switzerland > Off-Topic > Off-Topic > General off-topic  
View Poll Results: 6÷2(1+2) equals what?
1 45 47.37%
7 1 1.05%
9 47 49.47%
No idea 2 2.11%
Voters: 95. You may not vote on this poll

Closed Thread
 
Thread Tools Display Modes
  #21  
Old 03.06.2011, 11:51
Forum Veteran
 
Join Date: Jul 2008
Location: -
Posts: 1,640
Groaned at 26 Times in 22 Posts
Thanked 2,932 Times in 1,202 Posts
Russkov has a reputation beyond reputeRusskov has a reputation beyond reputeRusskov has a reputation beyond reputeRusskov has a reputation beyond reputeRusskov has a reputation beyond reputeRusskov has a reputation beyond repute
Re: 6÷2(1+2) equals what exactly

After some research, it appears to be 9. The confusion comes from whether the parentheses priority applies for everything inside the parantheses or everything that is done with parantheses.

Most of us (myself included) have been conditioned to do everything having to do with parentheses first, so we think the answer is 1. Apparently this is wrong. Once the problem gets to 6÷2*(3), the division and multiplication stand on equal footing and we calculate left to right.

It took lots of therapy and reconditioning, but I've come to terms with this now. (Actually, a thorough internet search. My initial poll vote is still for 1, LOL).
  #22  
Old 03.06.2011, 11:52
st2lemans's Avatar
Forum Legend
 
Join Date: Dec 2010
Location: Lugano
Posts: 32,224
Groaned at 2,456 Times in 1,777 Posts
Thanked 39,327 Times in 18,536 Posts
st2lemans has a reputation beyond reputest2lemans has a reputation beyond reputest2lemans has a reputation beyond reputest2lemans has a reputation beyond reputest2lemans has a reputation beyond reputest2lemans has a reputation beyond repute
Re: 6÷2(1+2) equals what exactly

It's 9, division/multiplication have equal priority, and priority is left to right.

Tom
  #23  
Old 03.06.2011, 11:53
economisto
 
Posts: n/a
Re: 6÷2(1+2) equals what exactly

Quote:
View Post
For the South Africans out there, remember BODMAS, not a word that makes sense but one I have never forgotten, I wonder if they still teach it like that.

Brackets
power Of
Division
Multiplication
Adddition
Subtraction

Therefore the South African answer is 1
BODMAS is correct, your understanding of it isn't

it's:

B
O
D and M in the order they occur left to right
A and S in the order they occur left to right
  #24  
Old 03.06.2011, 11:53
Ouchboy's Avatar
Forum Legend
 
Join Date: Jun 2008
Location: Baden
Posts: 3,324
Groaned at 58 Times in 47 Posts
Thanked 5,642 Times in 2,146 Posts
Ouchboy has a reputation beyond reputeOuchboy has a reputation beyond reputeOuchboy has a reputation beyond reputeOuchboy has a reputation beyond reputeOuchboy has a reputation beyond reputeOuchboy has a reputation beyond repute
Re: 6÷2(1+2) equals what exactly

Quote:
View Post
It's 9. The confusion comes from whether the parentheses priority applies for everything inside the parantheses or everything that is done with parantheses.

Most of us (myself included) have been conditioned to do everything having to do with paranthese first, so we think the answer is 1. Apparently this is wrong. Once the problem gets to 6÷2*(3), the division and multiplication stand on equal footing and we calculate left to right.

It took lots of therapy and reconditioning, but I've come to terms with this now.
That statement is wrong. it's 6/(2*3):

To show it clearer this is the evaluated expression:

6
--------
2(1+2)

This is the wrong assumption:

6
----- x (1+2)
2
  #25  
Old 03.06.2011, 11:54
economisto
 
Posts: n/a
Re: 6÷2(1+2) equals what exactly

this is all pretty scary. Not to be pig headed here, but isn't this primary school stuff?
  #26  
Old 03.06.2011, 11:55
Carlos R's Avatar
Forum Legend
 
Join Date: Dec 2009
Location: Roundn'about Basel
Posts: 7,232
Groaned at 105 Times in 95 Posts
Thanked 9,934 Times in 4,178 Posts
Carlos R has a reputation beyond reputeCarlos R has a reputation beyond reputeCarlos R has a reputation beyond reputeCarlos R has a reputation beyond reputeCarlos R has a reputation beyond reputeCarlos R has a reputation beyond repute
Re: 6÷2(1+2) equals what exactly

A=6/2(1+2)

A=6/2(3)

A=6/2x3

A=3x3

A=9

Quote:
View Post
A(B+C)= AB+AC
The A next to a parenthesis equals multiplication. Hence you need to resolve it. The fact that no multiplication sign is present seems to confuse most.

UtH is right.
See spoilers up for details.
Using your model:

A=6/2(1+2)

A=6/2x1+2x3

A=3x1+6

A=3+6

A=9
  #27  
Old 03.06.2011, 11:55
lost_inbroad's Avatar
Forum Legend
 
Join Date: Dec 2009
Location: Town or region
Posts: 11,491
Groaned at 655 Times in 417 Posts
Thanked 16,388 Times in 6,379 Posts
lost_inbroad has a reputation beyond reputelost_inbroad has a reputation beyond reputelost_inbroad has a reputation beyond reputelost_inbroad has a reputation beyond reputelost_inbroad has a reputation beyond reputelost_inbroad has a reputation beyond repute
Re: 6÷2(1+2) equals what exactly

Quote:
View Post
BODMAS is correct, your understanding of it isn't

it's:

B
O
D and M in the order they occur left to right
A and S in the order they occur left to right
That would make it 9 then.
  #28  
Old 03.06.2011, 11:55
Banned
 
Join Date: Mar 2010
Location: Graubünden
Posts: 636
Groaned at 69 Times in 38 Posts
Thanked 421 Times in 255 Posts
Wasted has an excellent reputationWasted has an excellent reputationWasted has an excellent reputationWasted has an excellent reputation
Re: 6÷2(1+2) equals what exactly

BODMAS

I shall remember this thread, next time I am having some intelligent discussion over here.
  #29  
Old 03.06.2011, 11:56
economisto
 
Posts: n/a
Re: 6÷2(1+2) equals what exactly

Quote:
View Post
That would make it 9 then.
It would indeed. The answer is 9.
  #30  
Old 03.06.2011, 11:57
Forum Veteran
 
Join Date: Jul 2008
Location: -
Posts: 1,640
Groaned at 26 Times in 22 Posts
Thanked 2,932 Times in 1,202 Posts
Russkov has a reputation beyond reputeRusskov has a reputation beyond reputeRusskov has a reputation beyond reputeRusskov has a reputation beyond reputeRusskov has a reputation beyond reputeRusskov has a reputation beyond repute
Re: 6÷2(1+2) equals what exactly

Quote:
View Post
That statement is wrong. it's 6/(2*3)
That's what I thought, too, but the brackets don't magically move from being around the 2+1, to somehow taking the 2 with them. The 2*(3) doesn't become (2*3). It stays 2*(3), which might as well be 2*3.
  #31  
Old 03.06.2011, 11:58
kevlegs's Avatar
Forum Veteran
 
Join Date: Jan 2009
Location: Far far away
Posts: 2,178
Groaned at 2 Times in 2 Posts
Thanked 1,324 Times in 700 Posts
kevlegs has a reputation beyond reputekevlegs has a reputation beyond reputekevlegs has a reputation beyond reputekevlegs has a reputation beyond reputekevlegs has a reputation beyond reputekevlegs has a reputation beyond repute
Re: 6÷2(1+2) equals what exactly

Quote:
View Post
So, nobody's got 7 yet
Cos it's 9
  #32  
Old 03.06.2011, 11:58
Carlos R's Avatar
Forum Legend
 
Join Date: Dec 2009
Location: Roundn'about Basel
Posts: 7,232
Groaned at 105 Times in 95 Posts
Thanked 9,934 Times in 4,178 Posts
Carlos R has a reputation beyond reputeCarlos R has a reputation beyond reputeCarlos R has a reputation beyond reputeCarlos R has a reputation beyond reputeCarlos R has a reputation beyond reputeCarlos R has a reputation beyond repute
Re: 6÷2(1+2) equals what exactly

Quote:
View Post
That would make it 9 then.
Even using your logic (see above your post)
  #33  
Old 03.06.2011, 11:58
taskalem's Avatar
Member
 
Join Date: Apr 2010
Location: Lausanne
Posts: 242
Groaned at 0 Times in 0 Posts
Thanked 160 Times in 96 Posts
taskalem is considered knowledgeabletaskalem is considered knowledgeabletaskalem is considered knowledgeable
Re: 6÷2(1+2) equals what exactly

Quote:
View Post
That statement is wrong. it's 6/(2*3):

To show it clearer

6
--------
2(1+2)
Actually your statement is wrong.
The equation becomes 6/2x3, not 6/(2x3). Don't invent the parenthesis by yourself.
  #34  
Old 03.06.2011, 11:59
Ouchboy's Avatar
Forum Legend
 
Join Date: Jun 2008
Location: Baden
Posts: 3,324
Groaned at 58 Times in 47 Posts
Thanked 5,642 Times in 2,146 Posts
Ouchboy has a reputation beyond reputeOuchboy has a reputation beyond reputeOuchboy has a reputation beyond reputeOuchboy has a reputation beyond reputeOuchboy has a reputation beyond reputeOuchboy has a reputation beyond repute
Re: 6÷2(1+2) equals what exactly

Quote:
View Post
A=6/2(1+2)

A=6/2(3)

A=6/2x3

A=3x3

A=9



Using your model:

A=6/2(1+2)

A=6/2x1+2x3

A=3x1+6

A=3+6

A=9

See post again. realize that you need to multiply.

1 1
-x- x 6
2 3

Quote:
View Post
Actually your statement is wrong.
The equation becomes 6/2x3, not 6/(2x3). Don't invent the parenthesis by yourself.
No parenthesis has been invented. I just stated them for clarity.
  #35  
Old 03.06.2011, 12:00
Carlos R's Avatar
Forum Legend
 
Join Date: Dec 2009
Location: Roundn'about Basel
Posts: 7,232
Groaned at 105 Times in 95 Posts
Thanked 9,934 Times in 4,178 Posts
Carlos R has a reputation beyond reputeCarlos R has a reputation beyond reputeCarlos R has a reputation beyond reputeCarlos R has a reputation beyond reputeCarlos R has a reputation beyond reputeCarlos R has a reputation beyond repute
Re: 6÷2(1+2) equals what exactly

Quote:
View Post
See post again. realize that you need to multiply.

1 1
-x- x 6
2 3
Sorry. I don't agree with your assumption - because you haven't completed the multiplications/divisions left to right, and have linked/prioritised multiplications on the right over those on the left.
  #36  
Old 03.06.2011, 12:00
porsch1909
 
Posts: n/a
Re: 6÷2(1+2) equals what exactly

Would this be a good time to say that this has been discussed to DEATH on the internet already?
  #37  
Old 03.06.2011, 12:00
Upthehatters2008's Avatar
Forum Legend
 
Join Date: May 2010
Location: In the kitchen at parties.
Posts: 4,540
Groaned at 204 Times in 120 Posts
Thanked 6,078 Times in 2,378 Posts
Upthehatters2008 has a reputation beyond reputeUpthehatters2008 has a reputation beyond reputeUpthehatters2008 has a reputation beyond reputeUpthehatters2008 has a reputation beyond reputeUpthehatters2008 has a reputation beyond reputeUpthehatters2008 has a reputation beyond repute
Re: 6÷2(1+2) equals what exactly

Quote:
View Post
Unfortunately you are wrong. The original of this equation should be like:
6÷2.(1+2). You can also put the "x" instead of "." When you have this it's clear: division is always done first. Now you can find the 9 result.
Sure, throw a "." in to twist the result to your answer ?
  #38  
Old 03.06.2011, 12:00
Forum Veteran
 
Join Date: Jul 2008
Location: -
Posts: 1,640
Groaned at 26 Times in 22 Posts
Thanked 2,932 Times in 1,202 Posts
Russkov has a reputation beyond reputeRusskov has a reputation beyond reputeRusskov has a reputation beyond reputeRusskov has a reputation beyond reputeRusskov has a reputation beyond reputeRusskov has a reputation beyond repute
Re: 6÷2(1+2) equals what exactly

Quote:
View Post
this is all pretty scary. Not to be pig headed here, but isn't this primary school stuff?
Eh, it's not a widely used math dilemma for nothing. Most people have had the parantheses priority drilled into them, to the point where it's taken up slightly erroneous dimensions.
  #39  
Old 03.06.2011, 12:01
Upthehatters2008's Avatar
Forum Legend
 
Join Date: May 2010
Location: In the kitchen at parties.
Posts: 4,540
Groaned at 204 Times in 120 Posts
Thanked 6,078 Times in 2,378 Posts
Upthehatters2008 has a reputation beyond reputeUpthehatters2008 has a reputation beyond reputeUpthehatters2008 has a reputation beyond reputeUpthehatters2008 has a reputation beyond reputeUpthehatters2008 has a reputation beyond reputeUpthehatters2008 has a reputation beyond repute
Re: 6÷2(1+2) equals what exactly

Google is also wrong....
  #40  
Old 03.06.2011, 12:03
Guest
 
Posts: n/a
Re: 6÷2(1+2) equals what exactly

Now I have a vision looping round in my head of my former maths teacher scratching his crotch whilst writing on the blackboard.

Damn, why did I look at this thread..?
Closed Thread




Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off



All times are GMT +2. The time now is 02:26.


Powered by vBulletin® Version 3.8.4
Copyright ©2000 - 2022, Jelsoft Enterprises Ltd.
LinkBacks Enabled by vBSEO 3.1.0