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View Poll Results: 8÷2(2+2)=?
1 18 40.91%
16 26 59.09%
Something else 0 0%
Voters: 44. You may not vote on this poll

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Old 08-03-2019, 02:41 AM   #1
larrymcg421
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Internet Fight: 8 ÷ 2(2+2)

I've seen lots of arguing about this on Twitter and Facebook. Some people say it's 16. Some people say it's 1. I think the answer is clear. What say you?
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Old 08-03-2019, 02:49 AM   #2
Chief Rum
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I put 16 based on the left to right rule for same level calculations but I feel like I heard recently they no longer teach that rule.
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Old 08-03-2019, 03:52 AM   #3
Brian Swartz
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The answer is clear if you know your PEMDAS. It's not at all clear if you don't .

So yeah, 16.
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Old 08-03-2019, 03:56 AM   #4
AlexB
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I voted 1, but then changed my mind - 16!

I was always taught do the brackets first, then do the sum. I can see how people get to 1 as I did - there’s a temptation to do the 2x bit first as well as it’s next to the brackets, but I realised that was my mistake.
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Old 08-03-2019, 05:18 AM   #5
BishopMVP
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I voted 1, but then changed my mind - 16!

I was always taught do the brackets first, then do the sum. I can see how people get to 1 as I did - there’s a temptation to do the 2x bit first as well as it’s next to the brackets, but I realised that was my mistake.
I started 16 then switched to 1 LoL. Maybe it doesn't in real life but I feel like spacing matters here to my brain. Since (I hope) we can all agree the (2+2) happens first...

8 ÷ 2(4) feels like 1
8÷2(4) feels like 16
8÷2 (4) definitely feels like 16
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Old 08-03-2019, 07:19 AM   #6
Racer
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I went with one initially.

It seems like 2(2+2) should all be in the denominator based on the lack of an "x" used for a multiplication sign.

However, it's not written as (2(2+2)) so technically the correct answer is 16 I think based on order or operations and the left to right rule but the equation is written in a really awkward way.
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Old 08-03-2019, 07:27 AM   #7
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Old 08-03-2019, 10:24 AM   #8
EagleFan
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2/3
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Old 08-03-2019, 10:26 AM   #9
EagleFan
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I'll postulate this:

8 / 2x = ?
x=2+2

how do you see that compared to:

8 / 2 * x
x=2+2
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Last edited by EagleFan : 08-03-2019 at 10:28 AM.
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Old 08-03-2019, 11:28 AM   #10
weegeebored
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I don't know how they teach math now, but computers process formulas with PEMDAS using the left-to-right rule with multiplication/division being on the same level, and addition/subtraction being on the same level. So, rewritten it's 8/2*(2+2). Parens first, so that's 4. Division next because it's the leftmost, so that's also 4. And unless math has changed, 4 X 4 is 16.

Put the formula into Excel and see what you get. If you don't understand that the answer is 16 then do you trust your bank or investment firm?
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Old 08-03-2019, 01:17 PM   #11
MizzouRah
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Originally Posted by Brian Swartz View Post
The answer is clear if you know your PEMDAS. It's not at all clear if you don't .

So yeah, 16.

Yep.. P first then M/D from left to right.
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Old 08-03-2019, 01:36 PM   #12
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Seriously
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Old 08-03-2019, 04:07 PM   #13
molson
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It seems weird that a math result would depend on going left to right. Shouldn't math transcend things like physical page placement?

Note, I don't understand math.
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Old 08-03-2019, 05:27 PM   #14
Brian Swartz
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I understand why it seems weird, but consider this:

8 x 4 x 2.

I think it's because of situations like this that there needs to be some kind of rule, the fact that it's possible to arrange terms such that there is no transcending distinction.
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Old 08-03-2019, 07:35 PM   #15
QuikSand
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not-this-shit-again.jpg

+16
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Old 08-03-2019, 09:55 PM   #16
EagleFan
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Solve for x:

8 / 2x = 16

Then solve for x:

8 / 2x = 1


It's all perspective.
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Old 08-04-2019, 01:53 PM   #17
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+16
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Old 08-04-2019, 07:11 PM   #18
MIJB#19
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I voted 1, but then changed my mind - 16!

I was always taught do the brackets first, then do the sum. I can see how people get to 1 as I did - there’s a temptation to do the 2x bit first as well as it’s next to the brackets, but I realised that was my mistake.
Same here. I would never write it down like that, 8:2x(2+2) or 8/2•(2+2) is less confusing to me, in particular that ÷ thingy.
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Old 08-04-2019, 09:18 PM   #19
ColtCrazy
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PEMDAS makes it 16. Order is always left to right, with multiplication and division done in the same left to right sweep. 2+2 is first (P) then the 8 divided by 2 followed by the times 4.
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