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Topic:
6÷2(1+2)= 1 or 9 ? [Locked] |
Cawlin  Posts: 1,759
Registered: 2005-2-22 07:58:42
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Date Posted:
1/1/00 12:00am
Subject:
6÷2(1+2)= 1 or 9 ? |
Rikarus posted:
Abaddon_Ambrosius posted:
OK, well, I'm probably wrong but this is the rudimentary method I was taught:
ooo = PMDAS
6÷2(1+2)
6÷2(3)
6÷6
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1
I thought when you did order of ops and you had equivalent operations, you went from right to left. Might be where I've screwed up. Or gotten it right. Who knows. I never got past basic stats and I let employees do this for me, the last decade or so. lol
No you have done it correctly, sadly math is no longer tuaght in our shcools.....they just have guess tables!
No.
http://www.mathsisfun.com/operation-order-pemdas.html
P Parentheses first
E Exponents (ie Powers and Square Roots, etc.)
MD Multiplication and Division (left-to-right)
AS Addition and Subtraction (left-to-right)
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If ignorance were painful, half the posters here would be on morphine drips.
Everyone playing WoW knows everything about playing two classes: 1) their own and 2) Hunters
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Date Posted:
1/1/00 12:00am
Subject:
6÷2(1+2)= 1 or 9 ? |
Like the last thread on on a similar question, some of you have shockingly bad math skills.
The answer is 9. After you resolve the parentheses, they go away.
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Sea_of_inK  Posts: 488
Registered: 2004-10-18 12:57:37
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Date Posted:
1/1/00 12:00am
Subject:
6÷2(1+2)= 1 or 9 ? |
Rikarus posted:
Abaddon_Ambrosius posted:
OK, well, I'm probably wrong but this is the rudimentary method I was taught:
ooo = PMDAS
6÷2(1+2)
6÷2(3)
6÷6
---
1
I thought when you did order of ops and you had equivalent operations, you went from right to left. Might be where I've screwed up. Or gotten it right. Who knows. I never got past basic stats and I let employees do this for me, the last decade or so. lol
No you have done it correctly, sadly math is no longer tuaght in our shcools.....they just have guess tables!
lol
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Yukishiro1 Posts: 3,243
Registered: 2002-9-20 23:52:57
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Date Posted:
1/1/00 12:00am
Subject:
6÷2(1+2)= 1 or 9 ? |
Cawlin posted:
Denominator and numerator have nothing to do with it.
They have everything to do with it. I already explained it above and I'm not gonna retype it. The problem is how you interpret the divided by sign. There is a reason you are taught never to write notation that way and always to use an actual numerator and denominator.
edit: Here's my previous post:
If you write it as:
6
______
2(1+2)
You get one answer.
If you write it as
6 divided by 2 times (1+2) you get a diff answer.
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Date Posted:
1/1/00 12:00am
Subject:
6÷2(1+2)= 1 or 9 ? |
Yukishiro1 posted:
If you just turn it into a different question, you get a different answer.
Thanks Yuki, you never fail to enlighten. 
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We have not inherited the Earth from our parents, we have borrowed it from our children.
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Cawlin Posts: 1,759
Registered: 2005-2-22 07:58:42
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Date Posted:
1/1/00 12:00am
Subject:
6÷2(1+2)= 1 or 9 ? |
Eternal_Midnight posted:
Yukishiro1 posted:
If you just turn it into a different question, you get a different answer.
Thanks Yuki, you never fail to enlighten.
To be fair, that's what Yuki's trained to do... however, in this case it's not correct to do so.
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If ignorance were painful, half the posters here would be on morphine drips.
Everyone playing WoW knows everything about playing two classes: 1) their own and 2) Hunters
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Yukishiro1 Posts: 3,243
Registered: 2002-9-20 23:52:57
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Date Posted:
1/1/00 12:00am
Subject:
6÷2(1+2)= 1 or 9 ? |
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The original notation in tenkly's title line is ambiguous. You don't know where the divided sign carries over to. As I said before, there's a reason one of the first things you're taught is not to write out equations that way but to actually use a numerator and denominator. That sign is only used in elementary division because of its ambiguity.
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Koneg  Title: Evil Genius
Posts: 894
Registered: 2001-12-4 15:31:28
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Date Posted:
1/1/00 12:00am
Subject:
6÷2(1+2)= 1 or 9 ? |
Abaddon_Ambrosius posted:
I thought when you did order of ops and you had equivalent operations, you went from right to left.
Only if you're British.
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"Any sufficiently advanced idiocy is
indistinguishable from trolling." -- Arthur C Clarke
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Cawlin Posts: 1,759
Registered: 2005-2-22 07:58:42
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Date Posted:
1/1/00 12:00am
Subject:
6÷2(1+2)= 1 or 9 ? |
Yukishiro1 posted:
The original notation in tenkly's title line is ambiguous. You don't know where the divided sign carries over to. As I said before, there's a reason one of the first things you're taught is not to write out equations that way but to actually use a numerator and denominator. That sign is only used in elementary division because of its ambiguity.
In order to handle it the way you want to Yuki, you need another set of parentheses.
6/(2(1+2))
The problem with notation comes in using the first set of parentheses instead of a multiplication sign (* or x) when there are no variables.
-----signature-----
If ignorance were painful, half the posters here would be on morphine drips.
Everyone playing WoW knows everything about playing two classes: 1) their own and 2) Hunters
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Yukishiro1 Posts: 3,243
Registered: 2002-9-20 23:52:57
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Date Posted:
1/1/00 12:00am
Subject:
6÷2(1+2)= 1 or 9 ? |
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Using another set of parentheses clears up the ambiguity. It doesn't mean the original isn't ambiguous.
As I've said like 5 times now, there's a reason you're taught not to use that symbol. It's a stupid question because it relies on bad notation.
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