does this upset you?

>>715199846
it makes me furious

the modern educational system is fucked

if I ever have kids I'm homeschooling them

looks like a 2nd grader learning estimation and he fucked up. This does not upset me. Kid probably didn't follow instructions

>>715199846
I guess the kid was wrong, but come on. Estimation is stupid bullshit. Math is about exact answers

>>715200024
It doesn't say estimate

>>715200192
but it also doesnt ask if 75 is the correct answer, just a reasonable one

>>715200384
>>715200299
>>715199846
giving me cancer

>>715200495
you're welcome. anyone having moar?

>>715200384
Wut

those are all fake so no upset here

>>715199846
silly
>>715200299
wrong
>>715200384
ill-conditioned question

> How Can Americans be so stupid as too vote for Donald Trump?
> How Can the British new so stupid as too vote leave?

Title this pic "Sun Sets On The West".

>>715200384
Whats the problem with this one?

>>715199846
Yup, shit like this is why I pulled my kid from public school systems... That and having to on an almost weekly basis go in and explain why the teacher was wrong about an answer. Stupid shits dont know a thing that isnt printed in a teacher guide.

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>>715200546
Not really, just other dumb shit where it's not a teacher

>>715200740
10 minutes to saw 1 board into 2 pieces
to cut a board into 3 pieces takes 2 cuts
each cut will take 10 minutes
20 minutes total to get a board into 3 pieces

>>715200740

count the cuts

>>715200474

Nothing is more reasonable than the exact correct answer you shit

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>>715199846
Why yes. Yes it does.

>>715200760
wronng even without the 4-5 fuck up. 2015 in roman numerals looks like this MMXV

>>715199846

One time an english teacher took points off a paper when i used a word she didn't know. so next paper, i used a shit ton of bizarre words nobody knows but were real and used correctly, and she just gave me a zero and told me she didn't feel like getting the dictionary.
so i started yelling about it in front of the whole class and embarrassed her into just giving me an A
thereafter my knowledge of words became a topic of interest for the class and i was always writing very long words on the chalkboard and defining them.
no, i didn't have any friends.

>>715200656
>ill-conditioned question
how? the way the student solved it seems right, while the teachers way doesn't make sense

>>715200852
>>715200885
Ah. I see how one would come to that conclusion now.

>>715201013
Not that anon, but the way I thought about it at first was 10minutes to do 2 actions and xminutes to do 3 actions.

>>715200384
>smart kids thinking outside the box being penalize because tyrone dun think so good

>>715201013

well thanks to common core you have to give the answer they expect no matter how stupid it is and even if it's not the correct answer.

>>715201006
Should have escalated it to a higher authority 2bh and threatened to go public about it shame the school so hard no sane parent would enroll their kids there again.

>>715200474
Do you not understand what reasonable means? Anyway I agree with the previous anon that said these are probably fake.

>>715200740
It took this bitch 10 min to cut a board in 1/2. It states if she works just as fast, every cut will be 10 minutes. So to make a board into 3 pieces that's 2 cuts ~~ 10 + 10 = 20

>>715201103
>literally training children to think in the most time consuming and inefficent means possible

dont you fucking dare tell me this isnt on purpose.

>>715201103

ffs, and they wonder why kids go on shooting rampages in schools
i have a bad feeling i'm going to be doing a lot of screaming at teachers some day...

>>715201034
How would one come to any other conclusion?

>>715201337
What bothers me the most here is I bet this same system teaches the commutative property of multiplication then states he is wrong.

>>715201358
kill me

>>715201358
NO!

In undergrad my physics professor gave me a 99 on a test instead of a 100. I got every answer correct, but he took off a point to show me that I "couldn't always get everything right," since I hadn't missed any points in the class.

>>715201006
Final year of high school, home room class is this headed by some 20 something hottie that had no business being in charge of a high school class.

None of the boys respected her, constantly gave her shit and teased her. I was the brainy/nerd of our small male group and everyone cheated off me. Teacher did shit about it because she was too stupid to figure it out until the final day of class. She decided to fail me instead of everyone else because I gave her the most shit. Didn't have the spine to tell me she was going to fail me to my face, learned about it when I got my report card. Women are cunts when given any kind of authority.

>>715201103
"the structure of the word problem"
Testing their comprehension more than anything. I guess because the "5" comes before the 3" it should be "five 3's" and not "three 5's"
and I don't know how they determine that "4 x 6" means 4 lines, rather than columns. they probably were told that it's always "lines first, columns second" or some stupid bullshit
I don't like cupcakes

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>>715201358
What is order of operations

>>715201501
fuck women, god damn every one of them is a cunt or acting

>>715201471
i wouldnt be mad. he's teaching you shit always isnt in your control. entropy seeps into everything

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>>715201543
Just a suggestion? It's 2016.

>>715201471
You should have gone in front of the school bored and complained, I bet she would have lost her job.

>>715201358
How do you even get 1 there?

>>715201228
i damn sure would have if she hadn't reversed the decision after i made a huge scene about it. cared a lot about my gpa.
but it was a public school and the only one that wasn't 40 minutes away by car.

>>715201595
Id be pretty mad. This anon clearly has not gotten everything right in every aspect of his life. No one has, everyone knows that. The professor was just being an asshole by penalizing someone for something outside the scope of the course.

>>715201471
Actually sounds like a based professor who cares about your education.

Ultimately, the problem is that people with math degrees can make a lot more money than being a teacher.

School boards all but offer blow jobs and candy for qualified math teachers. They're hard to come by.

>>715200384
The real question is why was marie out of the kitchen?

>>715201154
How is that thinking outside the box, it's the proper approach and answer to the question. The "no one said the pizzas were identical" answer was thinking outside the box.

>>715201738
That doesn't mean teach the wrong thing anon.

General mathematics isn't even difficult and should be a requirement for every human to know.

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>>715201632
>2016

God help us 2017 bring in some good changes.

>>715201644
20 / 5 ( 2 * 2 )
20 / 5 ( 4 )
20 / 20
They didn't get rid of the parenthesis after solving what was inside it, and then they still didn't work from left to right once all elements were on the same MD/AS
it should have been
20 / 5 ( 2 * 2 )
20 / 5 * 4
4 * 4

>>715201595
kek

>>715201641
It was a he. I'm assuming you're joking and just implying that it wasn't a big deal. I'm not even somebody who cares about having a 4.0. It was just mildly annoying and it seemed extremely petty for the teacher to do that, just because I made his tests seem easy or something.

>>715200852
Could be wrong because it'd take half the time to cut half of a board i.e 10+5 min
but the question is just retarded

>>715201362
Autism

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>>715201013

it depends entirely on your assumptions.
here's a solution that would result in the teacher's solution.

nowhere in the problem posed do you assume that the boards are of equal length

and it might seem nit-picky and counterintuitive... but I personally did very poorly in math in elementary school. now i'm working on my PhD. elementary school math is filled with all of these ill-conditioned problems that "punish" imaginative students who can think up several solutions to ambiguous problems

>>715201644
PEMDAS
20/5(2*2)
Parentheses: (2*2)=4
Exponent: None
Multiplication:5×4=20
Division: 20/20=1
Addition: none
Subtraction: none

>>715201917
the joke was only girls do stupid shit like that when it come to teaching, your professor must have been a tranny OR a HUUUGE fucking faggot.

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How do you retards know that the teacher actually wrote that comment?

>>715201938
No, the question is clear, the teacher is just thinking the wrong way because she's got girlbrains.

>>715201911
Even though you're right, you're fucking retarded
20/5(4) = 16 as well. It's whats IN the parenthesis that has priority, not next to

>>715200931
Again, it didn't say "what's the most reasonable?", it just asked if 75 was reasonable. Why are you trying to turn your problems with basic comprehension into someone else's math error?

>>715202131
That's what I'm saying. That's how they got their stupid answer, they thought it being in parenthesis still gave it power over division instead of just treating it like multiplication

>>715202081
Right - it's late and I'm tired.

Idk, he was just a dick who liked to think all of his students were stupid. He was always berating students for not being able to do kinetics calculations in their head and shit like that.

>>715200384

This makes me rage!

If it takes 10 minutes to saw through a board, it takes 20 minutes to saw through the board twice!

Fuck that teacher.

>>715201358

here is another example of an ill-posed problem. the ambiguous PEMDAS. in no place outside of primary mathematics education are people unclear about the order in which they intend their operations to take place

>>715202356

see >>715201988

>>715202056

it's multiplication AND division, not multiplication THEN division. they're equal.

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>>715202356
But now there's less board to saw through.

>>715202263
I feel ya man, If a my biology Prof. did that to me I'd lose my shit.
That's my major you're fucking with asshole you better KNOW I'm working to be "perfect" shit like that won't fly with me

>>715202087
stop stealing art you faggot

>>715202555
I think he's just pointing out how retards think

>>715201988
But there's a picture of the board next to the problem

>>715199846
>>715200384
>>715202356
This is because they hire unqualified women to teach. Look at the cbest test for teachers in CA, the math section should be harder for anyone actually teaching math. Testing should be more rigorous and subject specific. Primary and highschool usually don't like competent male teachers, they want a female babysitter. Walk into any middles cool or highschool, it's going to be a 5 women to one guy ratio. If they are nice they will let a guy teach gym or a difficult math class, maybe history if they are lucky. Just look at the pen color and see how right I am.

>>715201358

Bullshit. The order of operations is:

Brackets/Parenthesis
Exponents
Multiplication OR Division
Addition OR Subtraction

Further, when choosing between equal levels (like multiplication and division), do the problem left to right.

Thus, the problem becomes:

20 / 5 x 4, which equals 16 because of the left to right rule.

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I am this salty.

>>715199846

no. it seems that the exercise was to see if the student would use estimation, not subtraction. "explain your answer" is highlighted so simple subtraction is NOT the "final answer". subtraction is subtraction, unless there was another requirement to write "definition of subtraction" as a reason for it being correct. in real math, you have to define even numbers as 2n and odd numbers as 2n+1 and perform hundreds of changes based on rules for proofs. obviously this kid missed the point.

>>715202502
see >>715202800

>>715200749
I know some teachers, and I have heard from them that colleagues ought to be better educated before they are allowed to teach. I suspect your criticism is correct.

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>>715200760

Intelligent people don't teach kids. Some of them teach in undergrad, some teach in grad school or professional school. But zero genuinely intelligent people teach in middle school or high school. The most you can expect is a basic level of competence.

>>715201988
>>715202502
It says "another board", not the same one, so no.

Nice trying "critically thinking" there though

>>715202275
20/ 5(2*2)
20/ (10*10)
20/100
1/5

:^)

>>715201006
I did something similar in my grade 12 year. First paper, I used larger than normal/super obscure adjectives throughout the paper, got a high mark. Got it done right off the bat so the dick teacher didn't question my writing skills later on in the year if I used bizarre words.

Fuck you Mr Needles

PEMDAS is a convention to clarify not a mathematical fact.

Shitty math problems stressing that convention is so 1984.

>>715200749
>>715201337
I will likely do the same.

>>715201358
This is wrong but only because "the old way" is the new way, and "common core" is the answer I got using the actual old way.

>>715202172

Holy fuck you are retarded. You're saying that the correct answer is somehow not reasonable?

>>715203262
That's not entirely true. In high school I had a retired military physicist as my physics teacher.

>>715201988
>>715202502

That is a square. A board is:

a piece of sawed lumber of little thickness and a length greatly exceeding its width.

Boards are fucking rectangles!

Fucking teaching book doesn't even know English.

>>715203019
The child answered the question. It wasn't explicitly stated that she wanted a guesstimate for an answer, and the child explained the answer by showing the math.

Libcucks will blur every possible line to push their shit down your throats.

>>715202356
it works if it takes 10 min to cut the board length wise

>>715202939
exactly... it was never 1 before common core

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>>715203019
>implying a subtraction cannot be considered a valid explanation

Remove yourself from life

>>715203595

The problem is that the word piece must mean equal pieces if the problem is to make any sense.

So estimate the bank charging you a fee...

$1,000,000 vs $2.

Both answers are correct in common core.

(Bullshit!)

>>715203296

yeah that's how i got into the situation to begin with. got marked up for using great vocabulary, so i went out of my to learn more good words. i think she just got tired of looking up words. was grade 11.

>>715201988
But thats not a board. Thats a sheet. A board is a piece of wood thats at least 3 times longed than it is wide.

>>715201543
>What is order of operations
A social construct

what's the issue

>>715202356
Totally Agree.
If you look at the teacher's progression used to show the answer
10 min for 2 pieces
15 min for 3 pieces
20 min for 4 pieces
Then how many minutes for 1 piece? Hmm. By that reasoning it would take 5 minutes, but the board is already 1 piece, so it actually takes 0 minutes.
The problem is solved by determining the number of cuts (as others have already pointed out) [pieces - 1] so I say the teacher is an idiot for not recognizing that.

>>715203288
20/5(2*2)
((20/5)*2*(20/5)*2)
((40/5)*(40/5))
8*8
64

>>715199846
Is this common core math?
It's going to be history soon Betsy devos nigga.
That teacher should kill her/himself.

>>715205201
Just thought of something else...
If the teacher still doesn't understand the explanation, show up to school with a piece of wood, a saw, and a stopwatch. :-)
Just don't get arrested for bringing a weapon (the saw) on campus.

>>715201988
>>715202502
Not to be an ass but it never said the cut so people like me can assume same length wise cut as the previous 10 min cut although both answers should be correct as both answers are acceptable since some one might need both types of cut for a work related project

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>>715201103

Fml

>>715200299
IT NEVER SAID THEY WERE THE SAME SIZE REEEEEEEEEEEE

You nignogs are probably the same ones failing exams because you cant explain your work.

The question is about estimation. Not exact. The explaination provided by the student does not answer the question.

>>715200384
the real question is. why is Marie cutting wood and not it the kitchen where she belongs? go cut me a sandwich.

>>715201358
>both are equally correct
>mfw
I would figuratively murder that teacher if I was in her class. If someone tells you, in mathematics, that tow answers are equally correct, they are pants-on-head retarded. Math is precise, and the only way you get deviant answers ids if you are doing it wrong.

>>715201632

Hard water is water that contains a large about of minerals. Ice isn't the correct answer.

>>715201632
Lost. I would pass that kid just from the keks.

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It just makes me sad.

>>715208948

*amount

>>715208112
No, it isn't about estimation. Not once does the word estimate appear. It asks if 75 is reasonable, and to explain why. They answered yes, and explained the math, which is reasonable. Teacher was a scumbag. I have had a similar thing happen. Was told to estimate volume of a bottle with given dimensions, and I estimated the exact right amount, but told that was not an estimate. Still got the mark though.

>>715200171
>Estimation is stupid bullshit.
Estimation is applied Mathematics, and
contributes to the multi-billion dollar
construction industry.
Fuck off, know-nothing normie.

>>715199846
That shit would be getting brought up to the kid's teacher. The kid can obviously reason the way the problem wants him to, so why does the work have to be shown the "teacher's way"? Fuck teachers who do this. You are the reason I never liked math.

>>715199846
I would take that to the school board and ask them what the fuck is that retarded teacher thinking.

>>715199846
Is there a context tor this? If not, this is retarded. Is it murrican education system?

>>715210134
Estimation is nothing more than a logical guess based on unconfirmed rational numbers.

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>>715201358
IM SO MAD

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>>715201103

The fuck

>>715201504
>I don't like cupcakes
You can fuck right off.

>>715210282

depending on where in murrica you are, that would mean convincing them to take a time out from trying to mandate creationism be taught and science class and sex-ed only teach abstinence.

>>715210134
What is a cunt hair in micrometers?

>>715200299
Said Marty Ate more. Stupid cunt can't read

>>715200384
10 minutes for the stupid cunt to crosscut a 1×2.

this is why women should stay in the kitchen

>>715202172
It asked if 75 was reasonable. And the student answered "Yes, 75 is a reasonable answer", and then explained why.

How is that not a correct answer? The student answered the question and explained the logic behind the answer.

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>>715201103

>>715202110
This
That teacher has probably never operated a saw in her life.

>>715203595
That's retarded.

Using that logic you could also argue that she could just cut the corner off in about 10 seconds and call it a 3rd piece. It's obvious the question was suggesting she was making similar cuts. Otherwise there is no way a time could be estimated because she could be cutting it 1,000,000 different ways with 1,000,000 different answers.

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When I was in 5th grade we were going over length, width, and height measurements of objects. My stupid teacher said that length was ALWAYS, the longest dimension of any object, period. She offered extra credit to anybody who could find any object that was wider than it was long.

I brought in my book on military airplanes and pointed out numerous aircraft that had wider wingspans than their lengths. The measurements were all listed in the stats of the aircraft.

She said wingspan was length, and nose to tail of the aircraft was width...

>>715206165
To cut and rip a board are two different things, the diagram shows a crosscut

>>715201938
She's not doing a fucking rip cut out of nowhere it is 20mins.

>>715212512
This>>715211974

>>715201317
that makes perfect sense on # 2. But not #1
its always the bigger number the least amount of times. especially for arrays. That would be the time efficient way of doing things. NO fucking idea way she marked #1 wrong. but honestly its personal preference so... the kid is right either way.

>>715199846
nigga this shit is more fucked than me not stealin yo cracka ass bike when its not chained up fareal.

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>>715199846
>>715200299
>>715200384
You retards would kill yourselves over Calculus if you were smart enough to make it out of pre-algebra.

In Calculus, you often have to solve things in dumb ways to prove you know the concept being taught.

For example, solve pic related following the directions, without using geometry to subtract the interior volume from the exterior. Approximate the volume using differentials.

>>715212800
The thing is, this question explicity states HOW you are supposed to do it. Doing it with geometry is not following the instructions, while the posts you quoted are either vague or the teachers answer is actually incorrect

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>>715212800

>>715203561
Sprague High School?

ITT people falling for test answers "graded" by the same person. /b/ is as gullible as FreeRepublic

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>>715199846
>https://printables.scholastic.com/shop/prcontent/Distribute-the-Wealth-Understanding-the-Distributive-Property/9780439445061-023

>>715212477
You're teacher was either super smart, or dumb as a rock. Length and width are totally perception based, so technically whatever she sees as length in her mind is correct. Saying that length was always the longest is a retarded thing to say though.

>>715212993
No, those common core lessons tell you exactly how to solve the problem. They tell you, specifically, "approximate a solution by quickly mentally rounding these two numbers to make them easier to deal with."

Then, next year, they teach the kids to do it while carrying the numbers rounded off and re-adding them to the end result. It's supposed to teach kids to be accurate at mental math and it's based on how asian kids learn to count, and how guys like Gauss thought.

When Gauss was like 8 his teacher had his class sum up every number 1-100. It was supposed to take all period. Gauss finished in a minute or two.
Because he arranged the numbers in pairs: 1+100, 2+99, 3+98, etc. They all sum up to 101 and there are 50 such pairs. 101*50 = 5,050.

This is the same basic shit they try to teach in common core. They look at how the best mathematicians thought when they were kids and teach those insights instead of just brute force solutions.

>>715213335
This right here is the REAL problem with common core. It's developed by a group that overtly label themselves as Marxists. They push Communist ideological opinions on kids every chance they get, especially in history and civics classes, and to a lesser extent science. Math doesn't get much taint, though.

>>715213335
What's wrong with the distributive property? I learned it in the early 90's, it's actually a meaningful principle in math.

>>715200474
"yes 75 is a reasonable answer" they answered the question exactly as asked

>>715213600
Read the title of the worksheet.

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>>715203539
It depends on what the exercise was, theres not enough info on the page. The whole exercise could be to do with understanding the concept if estimation so you can make a quick decision in the real world.

>>715212993
If my calculus professor told me to approximate the zeroes of x^3+4x^2-8x+16 I would pull out Newton's Method and tangent line approximations using derivatives. I would NOT solve it algebraically. Because you use calculus in a calculus class. Not simple algebra.

The kids sitting in these math classes know that they're learning to round and approximate, not how to strictly add figures.

Or they don't know. Which is why they get counted wrong.

>>715213568
>When you're this retarded
Please elaborate on where exactly these problems are explicitly telling what the required methods for solving are.

>>715214005
In the fuckin classroom. These kids are sitting in math lessons being told, "This is how we're doing this" and then being given these assignments.

They are NOT taking kids who have never been taught to round and approximate and grading them harshly when they don't guess to do it on their homework. They're assigning these problems after these kids sit through at least one lesson, usually several, and by now, these kids usually DO know that they're supposed to round and approximate.

>>715205201
maybe it takes 5 minutes of initial setup. ie it takes 5 minutes to grasp the board in your hand before making the 0th cut

>>715214204
You aren't showing where this is told, only where you think it is. You're trying to use an inference as fact, and its making you look stupid desu

>>715212800
3100ish cubic cm fuck yeah for approximations.
And you're right for my special ass I couldn't even stand trig, But I was making up ways of solving shit in Chem and physics only the teacher could understand.

>>715214204
Not that guy, but I think the whole argument in this thread is that they shouldn't be teaching kids to do math in this asinine manner in the first place. Also, they shouldn't even pick up a calculator until high school. Fuck that. Just because they'll always have a calculator when they need it doesn't mean they should get lazy and refuse to develop their brains in the prime of their lives.

>>715213739
Oh, sorry. Yeah, now that I think about it, that is kind of a nudge toward liberal indoctrination. I mean, I personally agree with the government using some of my tax money to give the right people food stamps, shit like that, but my kid's there to learn math, not have other people push their politics on him.

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>>715200384

>>715199846
Quod irrumabo tu iustus fucking dicunt de me, parum stercore? Male vos scire Curabitur summo mei genus in in Navy Sigilla, et UI fuerint in multus secretum populationes Al-Quaeda, et mihi super CCC confirmata necat. Ego sum docti in orci militiae et Im summo sniper in tota US copiis. Sed tu mihi nihil aliud signum. Pedicabo delebo te cum praecisione similia quae numquam visa super terram verbis meis attende in stupri. Putas possit cum dicens quod stercore ad me super Penitus? Cogitare iterum, fucker. Ut loqui sum dictum occultis meis network exploratores trans USA et IP sit investigari nunc sic melius parare tempestas, vermiculus. Tempestate quod deleo ex in misellus parum res tu vitae. Vestra fucking mortuus, hœdum. Usquam possum, aliquando et super te interficere septingenti viis thats iusto nuda manus. Non solum sum late docti in inermes pugna, sed aditus ad totum armamentarium Civitatum Foederatarum Marine Corps et uti ad eius plena quatenus ad absterget tuam miseram asinum facie continens, parum stercore. Si modo potuit quid impia retributionem parvulus callidus comment erat ut super te, fortasse esset tenuit tua stupri lingua. Vos couldnt, non iam vestra solvendo pretium goddamn stultus es. Ego stercore furore omnes super te et erit mergunt in eam. Vestra fucking mortuus, kiddo.

>>715201358
wtf no way

>>715202924
you're a fucking idiot
this isn't women's fault moron this is common core; male teachers do this retarded bullshit too.

>>715210465
What the fuck are you talking about? You're spilling diarrhea from your mouth again.

>>715214720
They give foodstamps to anyone not just the 'right' people...
And if you put your kid in public school they are going go get a liberal indoctrination. See the above worksheet and know there are hundreds more just like it.

I think we are at the crux of the problem here.

Many posts in this thread say that the teachers are being cunts, but it's honestly the fault of whoever came up with the material.

I know little of the US educational system and a little about the infamous 'common core', but from what I've heard they get more money as a school based on student grades. It would stand to reason that there's some sort of control mechanism to make sure teachers are not allowed to give extra points or ignore mistakes on tests that have an answer sheet. Otherwise all teachers would say that all their students are straight A's and rake in money.

I'm going to assume that the problem is that whoever (or whatever organization) is making and distributing these questions isn't proofreading them, and the teachers don't have an effective way to provide feedback.

>>715213568
The method may be trying to instill knowledge and techniques found by smart people, but I think that even in the example you provided, Gauss was foregoing the method of addition he was taught and used lateral thinking. Some of the tests showed here effectively penalize lateral thinking, and worse still is that the answer is technically correct. It's just that this correct answer doesn't appear on the answer sheet.

The most logical thing is to find such questions that are badly made, and not make them count to the quiz total, for all students. I don't think teachers are allowed to do that though.

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>>715214367
Stop trolling, retard. You can look up the fucking lesson plans for this shit. This is how the kids are taught.

Do you mean to tell me you think they're taught normal math the way you were and then graded on this bullshit standard? Seriously?

>>715214467
Not actually even close.
It's 200*pi cm^3.
Or 628.32cm^3 if you estimate pi as well.

>>715214544
The whole point of common core is to educate kids to never need a calculator. Like those chinese kids that can multiply 3 digit numbers in their head? That's the goal of common core.

And for the record, at uni, none of my calc professors ever let us use calculators 99% of the time. That shell differential problem had to be solved by hand. Which, as you can see by pic related, is actually pretty easy. That's the beauty of approximations. Which is why they teach it in common core.

>>715203518
My question is why even teach 'the old way' for anything in a maths class?????

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>>715201358
Look, I learned PEMDAS. I don't care if it gets turned into PEASMD, or AEDMSP, or what the fuck ever. Just agree on a single standard, because no matter what, you should not have two different answers for that problem. That's the worst possible thing. Decide on an order, tell the world "This is how we're doing it from now on, so get with the fucking program." Done. And while we're at it, as much as it's going to be a pain in the ass, can my country swap over from English to Metric? I swear to God the way kids are being taught these days, Zephram Cochrane is going to fuck up the future of space travel and when he somehow decides that c is "approximately" 400,000 miles per second and launches particularte fragments of the Phoenix and his post-millenial ass into the Delta quadrant.

>>715200749
Pics of kid?

>>715213742
So in your terms, every value that's near the correct value is more reasonable than the correct value?

Dunno what planet your head orbits, but it seems like that orbit is decaying.

>>715215188
>The whole point of common core is to educate kids to never need a calculator. Like those chinese kids that can multiply 3 digit numbers in their head? That's the goal of common core.
>And for the record, at uni, none of my calc professors ever let us use calculators 99% of the time. That shell differential problem had to be solved by hand. Which, as you can see by pic related, is actually pretty easy. That's the beauty of approximations. Which is why they teach it in common core.

I don't personally know what goes on in other people's heads. I figured out the shell problem in my head just for a challenge, and after a few grinding noises, I got pi times 190, or roughly 597. But I had to do that with algebra. I took 25*pi - 20.25*pi for 4.75*pi*40. Why can't kids just be taught to do that?

>>715200299
>>715199846
>>715200384
>>715201103

Math teacher here. This sort of stuff is why we need our elementary school teachers to have a decent level of math training. If a student gets to the correct answer and their logic is sound do not fault them. Also you can't be vague in math, questions need to be clear.

I'm pretty certain how elementary school teachers handle the delivery of math lessons is why so many kids come into high school hating it.

>>715215347
Well all bedmas does is take out brackets.

Otherwise it would be:

(20/5)(2*2)

Also it would be written like this ideally...

http://imgur.com/a/JEgvr

So really bedmas was just made up so that you could quickly figure things out and quickly write shit without actually thinking about how it works.


For instance:

You're trying to figure out how much you make every half hour. You know you work 40 hours a week and take home 600 dollars every two weeks. You've been thinking about it all day, but can't figure it out. Someone throws the equation on your desk and you say thanks.

600/2/40/2

You get 6'000.

That doesn't make sense, you can't make 6'000 an hour!

But then if you can understand the equation then you know that all you need to do is divide 600/160, because you know that there's 80 hours in 2 hours of 40 weeks, and that you need to multiply the 80 by 2 to account for the half hours...

So, I guess what I'm trying to say is that bedmas in and of itself is bullshit, and you need to understand concepts.

>>715215819
Because you use differentials for a host of other problems that CAN'T be solved with algebra.

The shell differential problem itself isn't even necessarily a geometry problem! It can be taught as "You measure a cylinder and your measuring device has a potential for error of +/- 2.5cm, what is the potential distortion in the overall measurement?"

You then treat this as a shell problem and determine that the actual measurement of the cylinder could fall anywhere in the shell you just approximated.

You can also google "calculus error propagation" for a closely related topic.

>>715215883
Grade 8 math made me hate math. Now I'm an engineer, I majored in mathematics engineering in college and took a masters in mechanical engineering.

I still don't know how to do some shit.

>>715216052
Actually I think I am going to pick up the most basic calculus for dummies one day soon and see if I can grasp it a little better than those days. Used to destroy me.

>>715199846
standard core is the worse method of teaching ever
>there are many ways to understand a concept
>different people learn the concept better with different methods
>instead of finding out what methods a specific person learns best with
>lets teach everyone a half-assed version of every method

>>715215948
Oh, I understand the concept. You do that first and then you teach shortcuts. Sometimes I think our kids aren't being taught that, for example, it's 600 dollars divided by 2 weeks, making it 300, divided by 40 hours per week, for 7.50 per hour. And as a result, their lack of understanding is going to insure that they never get a job where they make much more than that after taxes anyway.

>>715216625
Exactly, it's complete bullshit. Nobody understands anything, most of us are fucking retards. Like I said I'm an engineer, the guys around me have no idea what our equations mean. It's a fucking joke.

>>715216571
now it's just
>there are many ways to understand a concept
>different people learn the concept better with different methods
>instead of finding out what methods a specific person learns best with
>let's teach everyone a half-assed version of ONE method that even Jamal can understand

>>715216798
You know, I think we actually got a fair grasp on simple shit like this by writing word problems. Seriously, we'd be given the numbers you gave me, then I'd regurgitate it as I did in my last post, showing the teacher my thought processes rather clearly. Then he'd tell me "you get it" or "no, you did this wrong, let's clarify until you get it." Do kids still do this?

>>715212477
Woulda showed her my 5inch cock with 6 inch girth.

>>715201543
BEDMAS. Though it should be BEMDAS. And really addition/subtraction is just combination, so the order doesn't matter.

>>715199846
This whole thread just reaffirms my decision to never bring another person into this fucked up world.

>>715199846
Teacherfag here (not in the US though)

While I want to get mad at this, I think that there might be something else to it. The teacher might've had the kids do this exercise to get a grasp of estimation and explicitly told them to not calculate the answer, but to get a feel for the numbers. Since the question ask for a reasonable answer and the fact that the teacher comments on the kid not estimating, that MIGHT be the case. However, I'm afraid that isn't the case.

I don't expect more from the US unfortunately, but I hope that shit will change.

>>715218444
Nice, written like a dumbass. I think I need to repeat myself a bit more to make it clear.

>>715200171
>Estimation is stupid bullshit. Math is about exact answers
How far are we from home?
Oh, about 3 km
No, that's stupid bullshit; we are 2 km 957.37 m from home.
.37
.38
.37
.38
(that's me breathing)

>>715215188
alright mister no calculator, what's the square root of 23 to 2 decimal places? show your work

>>715218444
>Wishy washy mumbo jumbo thought chain is more important than logic
great teacher

>>715218930
4.30

>>715219088
>show work
I don't give a flying fuck about the answer

>>715201103
lol

>>715213742
anon just admit it that you were home schooled by your alcoholic dad and you dont know shit about math

>>715219218
This how I would so it
16<23<25
4<root 23 < 5

4.5^2 = 20.25

4.5< root 23 < 5

4.75^2 = 22.5625

4.75< root 23 < 5

and so forth

I guess it is about 4.76

>>715212800
5^2*PI *40
3140cm³

>>715219768
This just is not an effecient an or intelligent method. You are guessing and checking for an answer, and even then your mid-point guesses assume the sqaure function increases linearly, which is does not.

If you actually want to be without a calculator, please learn one of the methods. They were taught in every math class in the country before TI and it's a shame no one knows anything

>>715218987
You've studied a lot of pedagogics, have you? Feeling overwhelmed at the sight of numbers and giving up isn't gonna give anyone a good chance to handle math. If they learn how to get a quick overview of numbers they will most likely be able to process it better if they would need to calculate that number.

You seem to think that estimation would be the end game of learning math, it isn't. It's a tool, much like yourself. If I asked you to check how many apples you had at home, you wouldn't count each one separetely, you would make an estimate and then most like divide the group into lesser groups and add those together. Like "it's a handful of apples" then "I see two apples there and three apples there, yeah it's five". Of course, this process is most likely unconscious, because you were taught estimation in school. If you get proficient, you can do this with relatively large numbers rather quickly.

Just because you don't understand something, it doesn't mean it's bad. Please refrain from posting without thinking.

>>715215177
They aren´t in America?
Should really get that changed. It´s even mandatory in germany, if you find a solution that is correct because the question is wrong or not specific enough you still either get full points for that or they have to remove the question entirely.
Had that happen to me 2 or 3 times in school. Especcially fun when they fuck up a question that should be hard but ends up having a simple solution aswell.

>>715220040
Why be taught something that isn't needed anymore. Sure it isn't an efficient method, but if I (for some reason) had to do it without a calculator that is how I would do it.

>>715220203
You're suppoised to learn methods that work without a method because, spoiler, you aren't actually doing anything interesting or important if there are numbers in it.

>>715218444
sorry but if you want them to give a rounded answer you should explicitly ask for it. This is math and not guess what I want you to do.
Also it would help if the question is about something where rounding makes sense.

>>715213335
lol commie propaganda

>>715220744
We don't know what the rest of the paper looks like, nor the instructions that the students were given. I've held classes where I spent a long time trying to get every single student to understand what we were going to do and yet after three "yes, I fully understand what we are going to do" they do the exercise in the wrong way, often with the excuse "I forgot lol".

Maybe there is a huge headline that says "ESTIMATION" with instructions that clearly says "Don't calculate, estimate!". Maybe they have been working on that all week and still, this student calculated the answer.

Given that the problem is really easy, it might be a very early grade and at that level you need skills such as estimation.

I'm not saying that it definitely is a estimation work sheet, but it might be. I'm not about to make a conclusive answer if I don't have all the info.

>>715199846
This is why your country is going down the shitter in the near future

>>715199846
The assignment was most likely to round the numbers. Though he answered the question right, he probably just didn't what was assigned

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>>715200384

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>>715218209
FUCK
When did our standard of teachers dip so fucking low?

>>715201809
So she can cut wood for the stove. Duh.

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>>715200384
man... one cut horizontaly takes 10 min, then the other half the girl cut is half the size, 5 min.

>board cut problem
That always annoys the shit out of me because I used to run a rip saw with my dad whenever we decided to build fencing. And if sawing the board takes ten minutes, you should not be sawing that board.

Also, I think of numbers spatially. I see 5 + 3 and think that there are five and three "objects" or "points" that are now in a group which numbers ten "things" total. It makes arithmetic slow but accurate.

>>715200384
this country is fucked. really sad

>>715222163
>ten
And I fuck it up because I meant to type 5 + 5.

>>715202712
Distributive property :^)

>>715213933
>Or they don't know. Which is why they get counted wrong.
Yes but they shouldn't because some kids have trouble with context and context is not really a math thing

>>715200760
ok, so technically you could say they replaced each individual digit with its roman numeral equivalent, EXCEPT THAT THE FUCKING ROMANS. DIDN'T HAVE FUCKING ZERO

>>715213933
Kids are supposed to be at a conceptual level to understand the teaching concept you described before they're at a level to do 103 -28? Fuck you dude

>>715201471
Knock him out and lock him in a freezer. Maybe he is alive in there, maybe he's dead. Who knows.

>>715212477
If you define length as the longest dimension of an object, then of course no object can ever have a width or height longer than the length. QED.
It's tautological.

>>715201358
There is nothing wrong with this honestly.

It all depends on how you would write out the problem. If you write it like that you get one answer, but if you write it as 20 over 5.. You get another answer.

>>715215188
>don't use calculator in calc
Yeah because the problems are designed to have easy solutions.
In all my calc classes (did up to calc 3 by murrican standards i believe) I have never had problems which specifically tested my calculus abilities using retarded numbers such as 837.039, they were all solutions with neat answers.

Most of the time, you're told to prove or show something. In that case the method is more important so ez numbers allow students to quickly reduce equations within the exam time.

>>715223021
Schrodinger's Freezer

My son is in third grade and he's being taught common core math. I teach him real math at home.

>>715221884
There is an image of a piece of wood. Good luck applying your drawing to that.

>>715223747
Bless you. We'll need him for the revolution.

>>715199950
Homeschooling is even more fucked

Literally every kid ever homeschooled is a piece of shit faglorrd

>>715215883
>I'm pretty certain how elementary school teachers handle the delivery of math lessons is why so many kids come into high school hating it.

So many of their teachers hate it, and that feeling trickles down into the students. It would help if schools didn't place complete morons to teach math and science. My high school had coaches teaching math and science just to give them something to do before football/basketball practice in the afternoon.

I went to a college that had a lot of education majors. The majority of them were women who went into it for elementary education because the math and science requirements were so low. They would come right out and tell you that. If it wasn't for education degrees, they probably would have become strippers, or outright whores.

>>715202939
715202939
What about distrbutive property? It doesn't apply here because it is a multiplication inside the parenthesis instead of addition/substraction?

20/5(2*2)
20/(5*2)*(5*2)
20/10*10

I'm mentally challenged, help!

>>715202439
>in no place outside of primary mathematics education are people unclear about the order in which they intend their operations to take place
This

I've studied math at uni and never in my life have I encountered ambiguity

It really goes to show that the problem lies in how insubstantial school is:
They throw you math without meaning to it, it's just random symbols that you are supposed to process mechanically
They don't do enough practical math

>>715223606
>>715208880
>>715201358
>There is nothing wrong with this honestly.
I think the main problem lies in saying "both are correct"
That's confusing as shit for children

If you teach common core, just TEACH. COMMON. CORE.
Or better still, tell the children to use fucking parenthesis

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This thread nearly made me legitimately cry with utter despair. Oh, humanity.

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>>715201988
oh shut up
you should understand that the whole point of the excersice was for children to realise that only two cuts were to be made

The lack of clarification clearly means it's a long board, because otherwise you can imagine all types of crazy shit and get any answer

>>715213568
>No, those common core lessons tell you exactly how to solve the problem. They tell you, specifically, "approximate a solution by quickly mentally rounding these two numbers to make them easier to deal with."
>Then, next year, they teach the kids to do it while carrying the numbers rounded off and re-adding them to the end result. It's supposed to teach kids to be accurate at mental math and it's based on how asian kids learn to count, and how guys like Gauss thought.

Except american schools include niggers and the teachers end up spending 8 years repeating the first couple of steps instead of progressing through the entire multi-year plan.

>>715201644
>>715201358
im 34 born and raised aussie - when i was taught the order of operations it was BIMDAS - Brackets, Indices, Multiplication, Division, Addition, Subtraction. So for me the answer would be 1, Ive heard things have changed since.

>>715203019
>if the student would use estimation
WAT
ARE AMERICANS TEACHING "ESTIMATION" TO CHILDREN?

it's something that shoudl come naturally from knowing math, wtf, how can that be a subject
I mean, teach fcking math, and then the teacher should use far-fetched examples to teach children how to avoid wasting time with complex operations, but how can you put that shit in tests? is ambiguos as fuck and it craps on children that are smart enough to make a simple substraction

shit
iMad

>>715201358
20/5(2*2)

2x2=4 - P.
No E
No M
20/5=4 - D
No A or S.
Two values to multiply are both 4
Final answer is 4x4=16

>>715224021
Nevermind, it's just used in additions and substractions.
a(b-c)
a*b-a*c

>>715202558
>But now there's less board to saw through.

she's still sawing through the same amount of board. it doesn't say she starts crosscutting through the remainder, it's making the assumption she's cutting a board the same way, which would be again through the same amount of board just into more pieces.

>>715212800
I rather be anal raped by michael jacksons ghost and i have bleeding hemorrhoids

>>715200760

i've never been mad about a pic before

>>715203019
Question: Is that a reasonable answer?
Answer: Yes it is fucking spot on, look at the math behind it. The person giving said answer most likely did the same math.

Can't see how that could possibly be construed as wrong

>>715214204
If your teacher told you to call the sky a red Cadillac with a turbo charger guess what. THAT TEACHER IS WRONG AND STUPID THE SKY IS BLUE I DONT GIVE A SHIT IF YOU THINK IM WRONG YOUR A RETARD AND A FAILURE AT LIFE

>>715215720
If the exercise is that you should round up and down to the closest, and find the difference between those, in order to quickly estimate, then the kid did not follow instructions.

Yes, it was wrong to have the exact number be a wrong estimate, but the exercise makes sense, and the kid didn't answer it correct. He could've said 25-100=75 instead, or followed instructions and rounded up and down.

Again, because I'm probably talking to illiterate nitwits, it was a poorly worded question when you wanted the kids to round up and down instead of calculating the exact number. They should've asked if 80 or 70 was a reasonable answer.

>>715199846
>>715200299
>>715200384
>>715201103
>>715201358
wow, is this in some shitty public schools? I don't know much about US education system, just heard that public < private there. Or is this some retarded twisted method of teaching kids to always question/doubt what others say, even teachers lol

>>715224001
MURICA!
EIIIIYEAHHH MURICAAAAAA
SUCK MAH DICK
IM MURICAN
MURICA FULL OF SEX GIRLS
DONT SHIT ABOUT MATH
JUST DO SOME HEROIN
AND RAPE A GIRL FOR BEING A GIRL
CAUSE WE LIVE IN MURICA YEAH
LARRY THE CABLE GUY WILL BE OUR NEXT PRESIDENT
AND EVERONE I HATE IS A MUSLIM JEW
CAUSE MURICAAAAAAN
MURICAAAAAAAAN
FUCK YEAH RETARD PEOPLE FROM A RETARD LAND
OHHHHHHH YEAH.
OOOOOOOHHHHH YEAH
FUCK THE GOVERNMENTq

>>715224385
Brackets ?
Indices?
What are these things.
I guess brackets are parentheses
Indices?
Like instance?

>>715224496
They also teach us how to brush.
And not touch each other
And to not talk
And to raise our hands .
And that the bullies are right you should stop antagonizing them
"Its not my problem if you stayed up till 11 pm last night cause you had so much homework"
Fuck american schools

>>715201358
>math is an exact science where two different results are equally correct
and I thought our education system back then was fucked

>>715224997
Murica

>>715200384
according to this, it takes 5 minutes to saw a board into one piece

let that one sink in.

>>715224385
bodmas would give you 16 because we were always told if theyve got no symbol between the equations to always times im aussie 27

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>>715201103
>>715200384
>>715200299
>>715199846
You can tell from the handwriting it's a chick grading the paper. It's amazing how dumb women really are, on average. If they had to rely on their brains instead of their looks to get laid, the species would have never made it out of the stone age. What a shame it is that most primary educators are women. No wonder we live in a country of morons here in Burgerclap.

See also: http://www.businessinsider.com/common-core-multiplication-quiz-2015-10

>>715212477
well you were probably discussing geometric objects like rectangles, where this is actually true

"i hope"

>>715200384

there isn't enough information in the question to get a correct answer.

are we talking 2 equal pieces? are the 3 piece equal or is one twice the size of the other 2? can the 3 pieces be any size?

>>715199950
If you home-school, be sure to make them do some kind of out of home sport for a while as well as an out of home music program. Both music and sports can be very fun and rewarding. This also puts them in the position to meet new people.

>>715218209
I was sent out the door for a similar thing, we had english (non native), and she was talking about the different pronounciation of produce (the verb) and produce (the drink)
she pronounced it wrong and used it in the wrong context, so I told her. I was sent out and the class learned it wrong. sad day.

but the worst thing was that the classmates actually asked me "why do you care so much?" and "that it just gets me into trouble"

... i really hope teachers are soon to be an outdated concept

>>715218209
1994 you fucking trollop. Unless your some old cunt this isn't new stuff.

>>715226879
Thats it im gonna kill some faggot dick shit brain teachers. Who wants to kill spree wwwithvme fuck this shit cpuntry with fuck diarrhea teachers teaching niggershit to fuckcocks dickwagon douchstove steamroller meatloaf.

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>>715201988

>>715218209
This can't be real... I hope

>>715199846
>>715200299
>>715200384
/b/ is facebook at this point. literally nobody cares