6-0+1 = 7
that's what i got. there's all these people saying 1 or 5, some even said 3.5. :\
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.
haha and there's even people saying "OMGZ PEDMAS!!!11" and still getting 1 or 5.
They must be misinterpreting the last division sign.
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)
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.
2012-12-24 05:31 pm (UTC)
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.
i just add the parenthesis when dealing with multiplication/division. makes more sense that way.
no, i did it in my head.
did your math teachers ever accept that reasoning? ;)
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.
6 - (1 x 0) + (2/2) =
6 - 0 + 1 = 7
I thought it was BEDMAS not PEDMAS.
This is why I failed math in HS...
"B" for brackets? makes sense, i always learned it as PEDMAS though.
Omg. It all makes sense a decade later!
Never late than never, I suppose
And by never, I mean 'better'. o_O
I learned PPDMAS (the other P being for "powers")
eta - so pretty much the same thing, just named differently.
Edited at 2012-12-24 08:03 pm (UTC)
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")
oops your eta didn't make it into my email lol sorry
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?
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.
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.