Tell me why the common core answer ISN'T the correct one

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>>9030404
because ""people"" like to write one line equations while saving on the parenthesis

20 / (5 (2 * 2)) = 1

(20 / 5) * (2 * 2) = 16

>>9030404
How would the old way get you one? Multiplication and division have equal precedence in the order of operations, and are solved left to right, so 20÷5(2×2) = 20÷5×4 = 4×4=16.

>>9030421
thank god i'm not the only one who knew this.

>>9030404
>>9030415
>>9030416
>>9030421

I'm a math teacher and I can tell you that the common core, at least for high school math, is vastly superior to what came before. Memes aside. If you don't believe that, go back to /pol/

It's not perfect, but it is better.

>>9030426
this being bait or not, kill yourself

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>>9030426
I'm a math teacher that's smarter than you and you're wrong.

>>9030426
math was better when calculus textbooks were 70-90 pages long and the size of a regular book.

Common core is literally the minimum you need for an education system in a state/school.

If your schools can't meet it or your state can't really meet it then there's huge issues in the education system/institute.

>>9030421
You are right. But to be fair, those rules were arbitrarily chosen to allow us to omit parentheses. And to be always sure, what someone meant by writing that equation you should have parentheses almost everywhere. Also you could have chosen other set of rules and it would be perfectly fine too.

>>9030426
How badly am I being trolled? Parentheses before anything, then multiplication or division, then addition or subtraction, right?

>>9030464
>>9030415
Oh I see. Is this simply because its written on one line, or is that what common core entails?

>>9030465
It was written in an ambiguous way, so it shouldn't even be a valid expression

>>9030404
Stop posting this photoshopped garbage bait already.

>>9030415
/thread

>>9030421
Here is how they found the one I beleive (I don't bother to know how to use TEX)


20/5 (2 X 2)
^
(4)
5 times 4 equals 20 and then you divide 20 by 20 to get one.

The parentheses carries on to the number after the parentheses problems are finished

>>9030689
9bviously. But for ambiguous statements like that, you use pemdas and by pemdas it's 16.

>>9030701
>pemdas
>16

no, it isn't

20 / 5 (2 * 2) P

20 / 5 * 4 M

20/20 D

1


>muh left to right meme

>>9030404
See >>9030493

>american education
youre kidding right? What and why is common core a thing?

Implicit multiplication takes precedence over division

>>9030426
Like I said before it makes smart people smarter and dumb people dumber because of its stupid and unsophisticated one-size-fits-all approach to introducing abstractions in mathematics, making it have an overall effect of dumbing down the population while promoting a greater intelligence/skills inequality gap in the population. And I haven't gotten started in English which is designed to dumb everybody down by providing options to eschew classics in favor of modern propaganda, so few people resist the status quo. It's not better, it's sloppy eugenics.

>Both answers are equally correct
LMFAO American """education"""

>>9030415
The 2*2 doesn't belong in the denominator of the other term.

>>9031048
It's not real.

>>9031048
yeah, i mean op was surely baiting by stating that the common core answer is the wrong one, but i doubt that picture is staged.

so, in case any american is wondering why europeans dont take them serious, theres the reason. the american education system is a bad joke.

These kids must be around grade 4 right? It's impossible they would learn that in the US. Most likely they'll be learning it in undergrad.

>>9030709
>20 / 5 * 4
>20/20
>evaluating from right to left
Manga virgins will defend this.

>>9031523
>peMDas
>peDMas
also >>9030869

>>9031531
Virgin detected.

Multiplication and division have the same presidence and are right-associative. Since it is right-associative, you work from left to right.

There is no difference in order with implicit or explicit multiplication. We learn this in first grade, maybe you were absent that day.

>>9030709
The way pemdas is taught, if you have multiple operations of the same tier such as multiply divide, you go from left to right.

>>9031255
You do realize that American top tier colleges are vastly superior to the colleges available in whatever country you hail from, right?

>>9030404
Or format the equation correctly without ambiguity. The same way everyone with an IQ of over 20 does.