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What is 5x3
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dancember
post May 26 2016, 08:36 PM
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this math question controversy has been on the internet for a while now but I must say I find it ridiculous that only one of the answers is considered as correct mellow.gif

could you guess which one it is?
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liamk97
post May 26 2016, 08:37 PM
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The second option because there are 5 lots of 3s? So if the question was "what is 3x5?" it would be the first option due to 3 lots of 5?
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HausAlone
post May 26 2016, 08:38 PM
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They are both mathematically correct, but for terminology the second is "more" correct because 5 x 3 is the same as 5 "groups of" 3.

But that's just a technicality and = means equivalent to, so this supposed internet confusion is misusing =
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dancember
post May 26 2016, 08:39 PM
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QUOTE(liamk97 @ May 26 2016, 09:37 PM) *
The second option because there are 5 lots of 3s? So if the question was "what is 3x5?" it would be the first option due to 3 lots of 5?
Yes, but it shouldn't matter!!!1
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t=SpunderfulXmas
post May 26 2016, 08:41 PM
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I thought the second one at first but then went with the first one because I can also read it as "5 multiplied by 3" but if I read it as "5 times by 3" I would go with the other one, lol

Do we get the answer and an explanation tongue.gif
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HausAlone
post May 26 2016, 08:42 PM
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QUOTE(PVRISPVDVM @ May 26 2016, 09:41 PM) *
Do we get the answer and an explanation tongue.gif

5 x 3 = 3 x 5 = 5 groups of 3 = 3 groups of 5 = 3 lots of 5 = 5 lots of 3

So there really isn't "only one "correct" answer"
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Oliver
post May 26 2016, 08:44 PM
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QUOTE(PVRISPVDVM @ May 26 2016, 09:41 PM) *
I thought the second one at first but then went with the first one because I can also read it as "5 multiplied by 3" but if I read it as "5 times by 3" I would go with the other one, lol

Do we get the answer and an explanation tongue.gif


That's how I read it, 5 multiplied by 3, so three lots of 5. laugh.gif
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HausAlone
post May 26 2016, 08:47 PM
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QUOTE(danG @ May 26 2016, 09:36 PM) *
this math question controversy has been on the internet for a while now but I must say I find it ridiculous that only one of the answers is considered as correct mellow.gif

could you guess which one it is?

Considered by who?

The only thing wrong is that you're saying there's only one correct answer. ;o
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Nadolig Llawen!
post May 26 2016, 08:51 PM
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The answer is 15 FFS. Isn't that enough?
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dancember
post May 26 2016, 08:52 PM
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QUOTE(HausofKubrick @ May 26 2016, 09:47 PM) *
Considered by who?

The only thing wrong is that you're saying there's only one correct answer. ;o

the common core curriculum / teacher who marked it
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HausAlone
post May 26 2016, 08:55 PM
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QUOTE(danG @ May 26 2016, 09:52 PM) *
the common core curriculum / teacher who marked it

?

The curriculum clearly states that multiplication is commutative and children need to know that.

Statutory requirements for Year 2:

" show that multiplication of two numbers can be done in any order (commutative) and division of one number by another cannot"

Touchy subject because some of my kids still don't get it.
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Michael Bubré
post May 26 2016, 09:21 PM
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Is this just a reference to this?



If so idk why you didn't just link that image because without its context what you're saying doesn't make sense ~
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dancember
post May 26 2016, 09:22 PM
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QUOTE(HausofKubrick @ May 26 2016, 09:55 PM) *
?

The curriculum clearly states that multiplication is commutative and children need to know that.

Statutory requirements for Year 2:

" show that multiplication of two numbers can be done in any order (commutative) and division of one number by another cannot"

Touchy subject because some of my kids still don't get it.

oh i should've mentioned - this was in the US.

(bre cos i wanted people to guess which one it was kink.gif)
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Yuki On Ice~
post May 26 2016, 09:25 PM
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Oh I recognise that picture now. I thought it was just a one-off case of exaggeration from an overzealous teacher.

The way I understand maths problems, I always work the first way around anyway, it makes so much more sense.
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Martyn
post May 26 2016, 09:33 PM
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When I first saw this, I thought it was someone who has five kids by three dads laugh.gif

QUOTE(Bré @ May 26 2016, 10:21 PM) *
Is this just a reference to this?



If so idk why you didn't just link that image because without its context what you're saying doesn't make sense ~


I find the second question in that picture more stupid. As if you look vertically, they do have four groups of six. It's only looking at it horizontally when it is six groups of four.
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CodySleighBell-y
post May 26 2016, 10:08 PM
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As a math major, I echo the statements that it doesn't really matter
QUOTE(danG @ May 26 2016, 02:22 PM) *
oh i should've mentioned - this was in the US.
OH GOD NOT F*CKING COMMON CORE

My little cousins are in fifth grade and my aunt was complaining about how confusing it was, and apparently their school didn't have a lot of people passing the Common Core EOY tests because of confusion stemming from stuff like this. I agree with T Boy, the answer is 15, no college professor would give a f*ck how you split it, it's the commutative property after all
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Dircandydircane
post May 27 2016, 04:14 AM
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QUOTE(Martyn @ May 27 2016, 05:33 AM) *
I find the second question in that picture more stupid. As if you look vertically, they do have four groups of six. It's only looking at it horizontally when it is six groups of four.

Technically speaking, matrixes & arrays are named as rows x columns, so there is a logic to it even if it's extremely pedantic and unnecessary.
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ionderella
post May 27 2016, 05:27 AM
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Yeah the second one is technically incorrect.
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HausAlone
post May 27 2016, 05:57 AM
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The second one is not incorrect either. Yes they are named as rows and columns but:

4 rows of 6 = 6 rows of 4

So they too can be done in any way round.

If the question was "draw an array with 4 rows to solve 4 × 6" it would be incorrect but not here.
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CodySleighBell-y
post May 27 2016, 07:51 AM
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QUOTE(Dircadirca @ May 26 2016, 09:14 PM) *
Technically speaking, matrixes & arrays are named as rows x columns, so there is a logic to it even if it's extremely pedantic and unnecessary.
QUOTE(💯 @ May 26 2016, 10:27 PM) *
Yeah the second one is technically incorrect.
QUOTE(HausofKubrick @ May 26 2016, 10:57 PM) *
The second one is not incorrect either. Yes they are named as rows and columns but:

4 rows of 6 = 6 rows of 4

So they too can be done in any way round.

If the question was "draw an array with 4 rows to solve 4 × 6" it would be incorrect but not here.
Math major time:

I can see what people are saying about "3 groups of five is not like 5 groups of three". Like if you make a family of three sets where each set has five elements, and there's another family of 5 sets where each set has three elements, it would make sense because the two families have a different number of sets. But the union of each family will contain the same number of elements in the set. So the Union of the family with three sets of five elements will have 15 total elements, which is the same amount as the Union of the family with five sets of three elements.

So like it's not wrong but it's not right either, and that's where the confusion sets in. It just looks f*cking WEIRD saying that the two equations are different.
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