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 6÷2(1+2)=?

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6÷2(1+2)=?
9
76%
 76% [ 16 ]
1
10%
 10% [ 2 ]
Other?
14%
 14% [ 3 ]
Total Votes : 21
 

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Hendo Maroon
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PostSubject: 6÷2(1+2)=?   Tue May 03, 2011 2:47 am


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PostSubject: Re: 6÷2(1+2)=?   Tue May 03, 2011 2:48 am

Guess not ...

Better to vote silently and not blab, then.
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PostSubject: Re: 6÷2(1+2)=?   Tue May 03, 2011 2:49 am

some dude on there got the answer 7??

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PostSubject: Re: 6÷2(1+2)=?   Tue May 03, 2011 3:26 am

It tricks a few people this one.

You have to do 1+2 first cause of the brackets, which is 3. Then the trick is to pick whether to do 6/2 or 2 x 3 first.

Doing 6/2 is what I'd do since it's the first one in the equation. We were taught in high school to do

Brackets
Powers
Division/Multiplication (in the order they appear in the equation)
Addition/Subtraction (as above)

Meaning it should be

6/2 = 3
3 x 3 = 9


(Note: I checked with a 4th year engineering student first Razz)
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PostSubject: Re: 6÷2(1+2)=?   Tue May 03, 2011 3:36 am

Yes. Exactly.
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PostSubject: Re: 6÷2(1+2)=?   Tue May 03, 2011 4:42 am

you're all over it Feldy.

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PostSubject: Re: 6÷2(1+2)=?   Tue May 03, 2011 11:13 am

Do the brackets first: 2(1+2) = 2x1 + 2x2 = 6
Then the division = 6/6 = 1
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PostSubject: Re: 6÷2(1+2)=?   Tue May 03, 2011 11:16 am

......

Brackets mean multiply, not divide.
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PostSubject: Re: 6÷2(1+2)=?   Tue May 03, 2011 11:19 am

I remember maths...
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PostSubject: Re: 6÷2(1+2)=?   Tue May 03, 2011 11:19 am

You multiply whatever is inside the brackets by whatever is out side of the brackets, in this case the 2 is outside the brackets and the 2+1 in inside. 2x3 = 6.

Then there is the division, so you are left with the original 6, divided by the 6 I just got.

6/6 = 1
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PostSubject: Re: 6÷2(1+2)=?   Tue May 03, 2011 11:21 am

(6/2)(1 + 2) [essentially]
(3)(3)
9

Wrong.
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PostSubject: Re: 6÷2(1+2)=?   Tue May 03, 2011 12:04 pm

(1+2) first
6/2 second
3(3) third.

9.
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PostSubject: Re: 6÷2(1+2)=?   Tue May 03, 2011 12:46 pm

Cynic wrote:
(6/2)(1 + 2) [essentially]
(3)(3)
9

Wrong.
Doing it your way, yes.

But I was always taught the number outside of the brackets was part of it as well. So the 2(1+2) is done first.
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PostSubject: Re: 6÷2(1+2)=?   Tue May 03, 2011 12:52 pm

Depends. Really to be clear it should be (6/2)(1+2)

but

Brackets (Inside)
Exponents
Division
Multiplication
Addition
Subtraction

is the order.

with 2(1+2) yes, the 2 is part of the brackets and it would make it six (or 10 in some types of maths but that's a different topic), however due to the 6/being pre it, it makes it part of that.

I can guarantee that 9 is the answer.
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PostSubject: Re: 6÷2(1+2)=?   Tue May 03, 2011 12:56 pm

So we've explained that about four times by now ...
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PostSubject: Re: 6÷2(1+2)=?   Tue May 03, 2011 4:01 pm

do it on a graphics calculator. you get 1.
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PostSubject: Re: 6÷2(1+2)=?   Tue May 03, 2011 4:13 pm

gdc's require brackets in every expression pretty much. don't trust the result.
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PostSubject: Re: 6÷2(1+2)=?   Tue May 03, 2011 4:41 pm

Queens Park wrote:
gdc's require brackets in every expression pretty much. don't trust the result.

that is true i suppose.



it may also depend on where you were taught. i know when i moved from nsw to qld they did it completely different to what i had previously learnt
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PostSubject: Re: 6÷2(1+2)=?   Wed May 04, 2011 1:49 am

chuck in google and you get 9.


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PostSubject: Re: 6÷2(1+2)=?   Wed May 04, 2011 8:54 am

Division and multiplication have equal precedence, so you simply just solve it left to right.

6÷2x(3)

So the answer is 9...

If it was written like this 2x(3)÷6 it would be 1.
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PostSubject: Re: 6÷2(1+2)=?   Wed May 04, 2011 11:44 am

The right answer is 9, it has always been 9 and it can't be anything else. That has been established.

Why people are getting taught different things (or not taught enough) is beyond, so i'm going to blame dumb maths teachers.
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PostSubject: Re: 6÷2(1+2)=?   Wed May 04, 2011 3:08 pm

The answer is 9. In this equation, you work from left to right.
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PostSubject: Re: 6÷2(1+2)=?   Wed May 04, 2011 3:18 pm

All_Star94 wrote:
The answer is 9. In this equation, you work from left to right.

you are right, but you don't work from left to right, if you did you would get 1.
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PostSubject: Re: 6÷2(1+2)=?   Thu May 05, 2011 12:52 am

how I got 9 is that I went 6/2 which equals 3 and then 3x3 which gets 9.
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PostSubject: Re: 6÷2(1+2)=?   Thu May 05, 2011 8:40 am

I realised that after I posted... I just assumed you meant Brackets then times 2 then divide by 6. Which would = 1

Because your meant to start with brackets I assumed your going Right to Left, not Left to Right even though you stated it.

I just had alot on my mind last night. My Bad
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