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[Dec. 24th, 2012|10:55 am]
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[rhyme_sayers]
can you please answer this question? show your work.
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[User Picture]From: obfuscate
2012-12-24 05:14 pm (UTC)

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6-1x0+2/2
6-(1x0)+(2/2)
6-0+1 = 7
[User Picture]From: rhyme_sayers
2012-12-24 05:18 pm (UTC)

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that's what i got. there's all these people saying 1 or 5, some even said 3.5. :\
[User Picture]From: obfuscate
2012-12-24 05:20 pm (UTC)

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90% of the answers to posts like this on facebook are people who are more confident than you could ever imagine in their completely wrong answers.
[User Picture]From: rhyme_sayers
2012-12-24 05:23 pm (UTC)

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haha and there's even people saying "OMGZ PEDMAS!!!11" and still getting 1 or 5.
[User Picture]From: yamamanama
2012-12-24 05:53 pm (UTC)

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They must be misinterpreting the last division sign.
[User Picture]From: just_3_euros
2012-12-24 05:15 pm (UTC)

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No.
[User Picture]From: rhyme_sayers
2012-12-24 05:33 pm (UTC)

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ty bb
[User Picture]From: dawgdays
2012-12-24 05:23 pm (UTC)

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The answer is 7.

There is an implicit order of arithmetic operations - PEMDAS - parenthesis, exponentiation, multiplication/division, addition/subtraction. Arithmetic operations are done in order of EMDAS unless explicitly altered using parentheses. Therefore, for this problem, the implicit order of operations is:

6 - (1 * 0) + (2 / 2) = 6 - 0 + 1 = 7

Those who forget PEMDAS end up doing it this way:

(6 - 1) * 0 + 2 / 2 = (5 * 0) + 2 / 2 = (0 + 2) / 2 = 2 / 2 = 1

Edited at 2012-12-24 05:25 pm (UTC)
[User Picture]From: rhyme_sayers
2012-12-24 05:32 pm (UTC)

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yeah that's how i did it too. i just wanted to make sure i wasn't completely math illiterate, which is why i came to you guys for reassurance.
[User Picture]From: pjii
2012-12-24 05:31 pm (UTC)

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7
[User Picture]From: whataspacecase
2012-12-24 05:33 pm (UTC)

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7. You do 2/2 and 1x0 first, because of order of operations. so then you end up with 6 - 0 + 1 = 7.

I've decided that multiplication and division are prioritized above addition and subtraction, with or without parentheses. Who knows if that is actually true though.
[User Picture]From: rhyme_sayers
2012-12-24 05:36 pm (UTC)

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i just add the parenthesis when dealing with multiplication/division. makes more sense that way.
[User Picture]From: madeofsequins
2012-12-24 05:35 pm (UTC)

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7.
no, i did it in my head.
[User Picture]From: rhyme_sayers
2012-12-24 05:37 pm (UTC)

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did your math teachers ever accept that reasoning? ;)
[User Picture]From: boplenty
2012-12-24 08:56 pm (UTC)

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Insisted on it. Would make us do integral calculus in our heads, no paper or calculator ... sad, really, a couple of kids weren't up for it, their heads exploded. Janitors hated that teacher.
[User Picture]From: boplenty
2012-12-24 08:55 pm (UTC)

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This ... 8-)
[User Picture]From: yamamanama
2012-12-24 05:52 pm (UTC)

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6 - (1 x 0) + (2/2) =
6 - 0 + 1 = 7
From: 234_am
2012-12-24 06:08 pm (UTC)

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I thought it was BEDMAS not PEDMAS.
This is why I failed math in HS...
[User Picture]From: rhyme_sayers
2012-12-24 06:10 pm (UTC)

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"B" for brackets? makes sense, i always learned it as PEDMAS though.
From: 234_am
2012-12-24 06:13 pm (UTC)

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Omg. It all makes sense a decade later!
Never late than never, I suppose
From: 234_am
2012-12-24 06:13 pm (UTC)

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And by never, I mean 'better'. o_O
[User Picture]From: bellapalmera
2012-12-24 07:59 pm (UTC)

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I learned PPDMAS (the other P being for "powers")
[User Picture]From: rhyme_sayers
2012-12-24 08:03 pm (UTC)

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Parenthesis
Exponents
Division
Multiplication
Addition
Subtraction

eta - so pretty much the same thing, just named differently.

Edited at 2012-12-24 08:03 pm (UTC)
[User Picture]From: bellapalmera
2012-12-24 08:13 pm (UTC)

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Yeah I understand that just I learned "powers" instead of "exponents" :) and the mnemonic was "Pretty Please My Dear Aunt Sally" (as opposed to "Please Excuse My Dear Aunt Sally")
[User Picture]From: bellapalmera
2012-12-24 08:14 pm (UTC)

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oops your eta didn't make it into my email lol sorry
[User Picture]From: alphonseohki
2012-12-24 07:55 pm (UTC)

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6 - 0 + 1 = 7

For those getting this, and I think I'm overthinking, why wouldn't the answer be 5? Doesn't addition come before subtraction so you'd get:
6-1=5? Where is my brain wonking out?
[User Picture]From: isunova
2012-12-24 08:34 pm (UTC)

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the acronym is PEMDAS which does have addition before subtraction, but it could be PEDMSA and still be correct - the best way to think of it was written above: parentheses, exponentiation, multiplication/division, addition/subtraction. you do everything in parentheses first, then anything with an exponent, then multiplication and division from left to right, and lastly all the addition and subtraction left to right.

another way to think of it: subtraction is just adding negative numbers. in 6 - 0 + 1, the six is implied positive bc otherwise there would be a - in front of it, so you should look at the three numbers like this: +6, -0, +1. positive six plus negative zero plus positive one = 7.
[User Picture]From: boplenty
2012-12-24 08:54 pm (UTC)

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6 - (0 + 1) = 5
6 - 0 + 1 = 7

Because of the commutative property of addition and subtraction, the second expression can be written 6 + 1 - 0 or 1 + 6 - 0, etc. The negative sign doesn't "carry through" unless you have parentheses. The PEMDAS mnemonic is confusing because it implies that addition "comes before" subtraction and multiplication "comes before" division, which isn't true.