This is why they're winning
another example of how leftists are poisoning the minds of students so that the smart ones can be on the same level as the retards
>showing questions without directions
The bane of my existence. I've had tests in my calculus class where I've failed because I didn't use the right formula even though the instructions specified "use so and so formula to answer the following questions."
>>73534239
this is pretty sickening
>>73534239
>america
>>73534239
>inb4 leftist or JIDF denies this is the doing of kikes
https://www.youtube.com/watch?v=LQ8Nr3_2724
>>73534239
That is awful
do teachers think this is progress? i know they have to perform whatever curriculum theyre given
this is about as dumb as getting rid of phonics
WTF America, how do you explain this level of bullshit.
>>73535749
>26 + 17
>all the rest
hähhh? Whaaaat?
>>73535553
To make people dumber, you have to get them at a younger age.
It's all part of the plan, goy.
>>73535749
This is not that dissimilar from how I would calculate return change for customers when the cash register was broken.
But I mean, you're dealing with an extra digit and multiple denominations of coin in that case, so it's simpler (imo) to break it down into component parts (sometimes).
But ya
>>73534239
>>73534504
>>73535749
are generally retarded.
>>73534239
>asks for reasonable estimate
>gives straight mathematical answer
>gets marked wrong for the wrong answer
must take this to the internet
>>73536133
That's just it, this is something that just about everyone who can actually do math already did in their heads. They shouldn't have to write it down. All that does is slow down the process and people who didn't do it before certainly aren't going to learn how to do it now.
>>73535749
stupid people needed a way to make sense of the mysteries of addition and subtraction
why this is standard in schools now i dont know. it would be easier to find people in minimum wage jobs and teach them this crap
>>73535749
I don't see anything wrong with this. It's just mental arithmetic and how most people do it in their head. Just looks weird being taught to children explicitly
Are there actually people who think this is good? I'm serious. Somebody thinks this teaches mathematics?
>>73536310
Learn to read, estimate is not said once in the entire question
>>73534504
>then add 3
dude.... what
Idiot amerifats.
Your idiocy disgusts me.
>>73536572
Because it shouldn't be taught explicitly.
This is just pandering to people from countries that historically never developed math on their own, then went centuries without education of any sort, and are now clinically retarded but excused because 'das racis'.
In the drive to educate them, regular, non-retarded people are forced to retard their education and mental faculties by years.
>>73534239
>>73534504
this was a republican idea...
>>73535749
>take 3 from 26, 17 + 3make 20
>add 23 + 20 = 43
Literally all they had to say. Who the fuck writes these explanations? It's like some gook tried to write it in French, then an Indian translated it from French to Cambodian, then that was translated finally into English by a retard.
>>73536688
>take an entire additional step to subdivide 5 into 2 + 3 to answer the way WE want you to.
Is this like New Math? My mother said that drove her crazy.
>>73536310
asking retarded niggers to estimate something that is explicitly defined is fucking dumb
if you flatten the range of potential answers you end up with a flattened sin/dist curve, which means everyone gets A's
you're not fooling anyone
>>73536857
It was a Jewish idea designed to combat "white privilege."
https://www.youtube.com/watch?v=LQ8Nr3_2724
>>73537089
passed by and signed into law by republicans
>>73535749
This must be a joke
>>73536786
It's not idiocy. It's a deliberate policy to create a generation that can be shaped mentally as the government sees fit.
When even basic mathematics is made relative to artificial human standards, then nothing in life is objectively true anymore. And if anything is relative, then anything goes.
>>73537129
lmao
>>73537161
Sure pal.
>>73537129
>It took Maries 10 minutes to saw a board in pieces. If she works just as fast, how long will it take her to saw another board into 3 pieces?
>Answer: 20 minutes
>WRONG
>Answer: 15
HOW?
1 board into 2 pieces = 1 cut
That 1 cut took 10 minutes.
if she worked just as fast to cut another board into 3 pieces, then that is 2 cuts, if 10 minutes each.
20 minutes.
How is the answer 15?
>>73537209
this is reasonable. it helps to quickly add and subtract large numbers in your head.
>>73534504
>>73534239
The fuck am I reading? Is it an estimating lesson?
>>73536857
>>73537161
are you joking, or do you legitimately think the NGA is a republican organization?
>>73534239
This is why I'm sending my kids to private school for WASPs - with no nigs, no trash, no jews, and all the teachers have PhDs.
>>73537063
>>73537296
What in the fuck, no one can be that retarded.
>>73537396
The answer is 15 because it's in a state that only requires a two-year degree to teach.
>>73537394
it was. ignoring facts makes you just as stupid as the very people you intend to mock in this thread.
>>73537063
>Wrong! Do not think creatively!
>>73537417
What's not reasonable is that if a student can give the right answer within the given time limit using a sound and precise calculation, he is marked down for not being vague enough.
>>73534504
This is how you add fast, you fucking retard.
>>73537129
To be fair, I can see the reasoning of it being 15, but it is mixing fractions and time and not really taking into account the reality of cutting a board into 3 rather than 2.
>>73537491
that was signed into law by a republican congress
>>73537491
No, but the GOP is a republican organization...
>>73536652
And you can't see the entire sheet or know what the day's lesson was but judging by the teacher's note, it was on techniques for making estimates. Going into hysterics over what is clearly manufactured outrage through cropping is what SJWs do. Don't become a reactionary idiot like they are.
>>73537546
Making up facts as you go along is even worse.
Show me proofs and I might take you seriously.
>>73537586
the point of the exercise was to practice mental math, so yes the student was not "vague enough" to merit a perfect score.
>>73537589
I don't need to use any techniques to add fast for 8 + 5, and for large numbers the techniques I use are only meaningful in my head. With paper, why not just do the fucking math problem?
>>73537296
>taking off because the array is vertical instead of horizontal
the only reason I could agree with this is if it was a fucking programming class!
>>73535749
>>73534504
this is literally how i do math in my head.
tell me exactly what is wrong about this?
oh yeah just incase anyone wants to know i was AP calc.
i seriously cannot believe anyone here is mad that they are teaching people how to simplify math problems so that stupid shit like adding 5 to 27 isnt the bottleneck when you need to learn formulas or division or w/e people get stuck on
>>73537823
Do you not see how fucking stupid that is?
>>73537586
It's a simple problem to teach the concept. Being able to quickly do estimates is an important skill. But to teach it you can't start off with complex problems. You start simple to build to the complex.
>>73537823
Math isn't about being 'vague'.
Hope America enjoys the next generation of engineers.
>>73537296
The first problem (I think) is meant to be read as 5 groups of 3, so while the answer is right, the teacher wanted them to show work in the way they practiced. The kid got it backwards.
If this logic follows into the next problem, then it should be 4 rows and 6 columns, not 4 columns and 6 rows.
I know it sounds silly, but the teacher wasn't testing the ability to do math, but rather the child's ability to read and correctly interpret math problems.
>>73537396
because the teacher is getting "cuts" and "pieces" confused.
The teacher is thinking 10 minutes for 2 cuts, so it would be 15 for three cuts.
The teacher is just speedreading
>>73536572
Except how we all do math mentally is different.
That isn't intuitive at all to me because what I would do is
26 + 17
( 20 + 10 ) + ( 6 + 7)
30 + 13
43
It scales well with large numbers too and I didn't need anybody to teach me it. This stupid shit is ridiculous.
>>73537823
But if the student can do mental math without having to use "friendly numbers," why penalize him for that?
It's just weighing him down. Attempting to force him to conform to the lowest common (friendly) denominator, rather than encouraging and nurturing his natural abilities and superior intellect.
>>73537899
How is adding more steps to the calculation a simplification?
>>73537556
>>73537543
>>73537063
the teacher most likely spent atleast 30 minutes explaining to the class why 4/6 is greater than 5/6 and this dumbass still got it wrong.
>muh creative thinking
>>73534504
The question is the problem. Maths is all about constraints, you said I could add 5 and 8, you didn't say SHIT about making 5 into 2, there is no subtracting 3 option
>tell how to make 10 when adding 8+5
what the FUCK is THAT
>>73534239
Sweet fucking Jesus when the right answer is deemed wrong.
>>73538038
>are you sure the bridge will work right? did you build it to specifications?
>dude seriously? stop getting into details, don't you see how inefficient it is? the bridge is good enough, I went over it in my head pretty quick.
>>73535749
I do
>6+7=13
>20+10=30
>13+30=43
Would I fail common core?
ANYONE who believes that Common Core shit is actually doing anything more than making kids fucking dumber than ever should be hauled off to the gallows for public execution.
I'm sure homeschooling is looking more and more attractive to parents these days with the retarded shit they're teaching kids that only is holding them back more and more.
>>73535749
This might seem retarded at first but it's because 17+26 is a simple problem that most people can do in their head without the unnecessary steps but when you're working with larger numbers say 1775+1039. It makes sense to add 39 and to 1775 and subtract it from 1039 to simplify the problem. There's also a trick to find the value of a square but this trick may seem retarded when working numbers 1-15 because most people already know those squares or can do them mentally without a trick. But the trick is this say I want to find a the square of a number around 50 then I do this (50+y)^2=2500 + 100y + y^2. If I want 47^2 plug in -3 for y. This we have 2500 -300 + 9=2209. In my opinion this is faster than trying to brute force it and it helps students think in a different way. Another classic example of finding simpler computation methods that may seem dumb at first for small numbers is how gauss calculated the sum of the natural numbers from 1 to 100.
>>73537899
If you cannot instantly add 5 to 27 you will not be using formulas for anything any time soon anyway.
>>73536857
>implying the neoconservatives and progressives don't work together at the top.
-we're taking the party back, believe me.
>>73537063
The kid got it right. The teacher fucked up, given that the problem statement is correct.
>>73537765
common core was implemented via no child left behind.
conservative news:
http://www.usnews.com/opinion/knowledge-bank/2015/12/09/we-didnt-need-to-replace-no-child-left-behind-with-every-student-succeeds
Of course, there are also several No Child Left Behind-linked practices that have grown increasingly unpopular with either educators or parents (or both), including the widespread adoption of the Common Core, a trend toward more-focused teacher evaluation, more prevalent standardized testing and an uptick in school turnaround strategies that don't seem to yield much.
hipster news:
http://www.npr.org/sections/ed/2014/05/27/307755798/the-common-core-faq
3) Why do we need the Common Core?
Several arguments have been made in favor of creating a single set of expectations for what students should know and be able to do:
No Child Left Behind, a federal law, mandated that all states give annual tests in grades 3-12 to ensure that all students were proficient. However, each state chose its own test and its own definition of proficiency. So, in practice, the numbers couldn't really be compared from state to state. In theory, with the Common Core come common definitions of proficiency for each grade, allowing for clearer comparisons of how kids are doing from state to state and school to school.
there's other news sources like forbes and washington post but they're under paywalls.
>>73538211
Except the way the kid wrote it could also mean he understood the problem and wrote that as a fuck you to the teacher, and what the teacher wrote is objectively wrong with the information given.
>>73538178
for some people adding 38 + 36 shit gets confusing keeping in your brain the numbers carrying over or what not.
its much easier to just think "ok 30 + 30 + 14" or even 40 + 34.
nobody ever taught me the common core stuff but some people literally never learn these shortcuts which really help simplify math at an early age which is important to ensure that they dont just give up when they havent even gotten to multiplication yet
>>73537063
>reasonableness
>>73538363
All anyone can hope for is that they would fail common core, anon.
>mfw want to laugh and point fingers at the Americans, but remember the German education system is even dumber and even more subverted by gommies
>>73537619
>>73537626
common core hasn't been voted on by congress!
Neither NCLB nor ESSA were common core bills.
They were just bills which had particular issues which individual states attempted to solve by enacting common core.
There is no federal law requiring common core, that's why 8 states (7 which are republican) don't have any form of it.
And several only implemented part of it.
>>73538211
>"How is that possible?"
>not asking "Is this possible?"
Question was written such that the kid answered correctly. kys tbqh
>>73538060
That's so unintuitive though. The array problem for instance lists it as 4 x 6 and he does a width of 4 and a height of 6. Why would he think to reverse the width and height?
>>73538522
theres a 5/6 chance that he said it as a fuck you, but a 4/6 chance he is just a dumbass who wasnt paying attention in class
>>73537912
to the contrary. solving problems without resorting to pencil/paper or calculators is important.
>>73538038
engineers need to solve problems in their head.
>>73538166
the student is not doing mental math. he wrote it all out. writing it all out is weighing him down.
>>73537129
ROFL STUPID BITCH
>>73537899
I say that 8 + 5 is 15 - 2, 13. Because 8 is the same as 10 - 2
Ah yes a perfect way to make sure that parents can't help their children so black and white children will now perform the same in school
Thank the feds for making sure that everyone is equal, and those going to private schools are more equal than others
>>73534239
No wonder we've fallen so far behind on the education spectrum
Why don't people realize that nationalizing things like education doesn't work in America because not everybody in a country of 350 million people is retarded or this batshit insane
>>73537608
You need two rounds of sawing to get a board into three pieces. If you assume they want pieces with an equal surface - there is no reason to assume otherwise - and it takes 10 minutes per round of sawing, then 20 minutes is right and 15 minutes is wrong. But here's the thing - it's not about right or wrong. It's about control. It's about them being able to set a subjective standard that students must comply with regardless of whether the standard is right or wrong. It's like the system of education that the Prussian government implemented in the nineteenth century - meant not to exercise or use the human mind, but to create a loyal caste of young footsoldiers who will not question whatever dogma you feed them.
>>73537823
If the student was given a task and a time limit, and managed to work it out in full detail within that time limit, why complain except as a means of control, to establish roles of dominance and submission? If his mind can process and write down the entire calculation in the time that it takes a regular student to come up with an estimate, then he has a certain talent that might give him an honest advantage in life.
>>73538787
You mean smart. That's the real reason.
>>73534504
>Take 2 from 5
3
>then add it to 8
11
>then add 3
14.
The fuck is this shit?
>>73538534
That isn't even how common core teaches it and you should be able to do that because in school you learn about the properties of math.
x + y = z
We are trying to find z, but technically the equation I put holds true as long as you duplicate every operation you do.
For example this is the same problem
(x + a) + (x - a) = z
Once you understand that, which you should in elementary school, the "tricks" are not tricks, it's just doing fucking math.
>>73535749
Reading that paragraph gave me a concussion
>>73538740
exactly what the teacher is trying to teach in
>>73537209
im glad someone has finally figured it out!
>>73538688
Not really. The kid was obviously meant to do it the way he/she was taught.
Also, in real world math (programming for instance) arrays are x rows by y columns.
>>73538674
the teacher most likely went over problems like this for atleast 30 minutes. they probably did atleast 10 problems like this in the exact same format of "3/4ths of a cake > 2/4ths of a cake" or "9/10ths of a pie > 8/10 of a pie" and this dumbass still got it wrong.
"good job" for being creative but most likely he wasnt being creative they are just a dumbass who wasnt paying attention and/or literally thinks that 4/6 > 5/6ths
>>73534239
This can't be fucking real life
>>73538732
>solving problems without resorting to pencil/paper or calculators is important
>engineers need to solve problems in their head
Says who??
Engineers need to have precise calculations, end of story.
>>73538732
Yes, solve them.
Not guesstimate 'close enough'.
They should teach children to do math correctly on paper so that when they're 21~ and sitting in University, they don't need to learn how.
They should be able to do this "Common Core" math in their heads instinctively, and I am sure most could, like the rest of America and Europe could do it before this stupid education policy was implemented.
All this does is retard the education of smart and average students so that Demitirius doesn't feel left.
>>73538060
doesn't matter in multiplication, it's pure authoritarianism reeeeeeeeee
>>73534239
A major goal of common core was to make a curriculum where all racial groups scored the same, essentially the only way to produce such a curriculum is by making it based on chance and giving the teachers more leeway to apportion points as they see fit.
>>73538732
I get it, but the problem was worded/constructed poorly. It should have made 'estimation' clear, and had a long list of numbers (ex- shopping list, extremely common use for quick estimation)
>>73538728
There is a 100% chance you can't do math with a response like that.
>>73534239
I....but....what?
What the fuck was wrong with "carry the 1?"
>>73535749
That's not how you do that.
26+17
20+10 = 30
6+7 = 13
13+30 = 43
If you cannot do simple short form vertical calculation in your head, you need to git gud or get on the short bus.
>>73538211
>30 minutes explaining to the class why 4/6 is greater than 5/6
>4/6 is greater than 5/6
>4/6>5/6
>0.667>0.833
>>73538900
>If the student was given a task and a time limit, and managed to work it out in full detail within that time limit, why complain except as a means of control, to establish roles of dominance and submission? If his mind can process and write down the entire calculation in the time that it takes a regular student to come up with an estimate, then he has a certain talent that might give him an honest advantage in life.
in america we have homework, which is not timed. and clearly his mind cannot process the calculation since he has to write it down.
>>73539167
2deep4thou :^)
Why don't we just follow what other countries with more rigorous public education standards do?
>>73538914
That's sensible, moving from Indiana to Florida there was a stark difference in the general level of education, but the fact that they're doing it in such a backwards way to make sure everyone is up to the same standard WHILE PREVENTING PEOPLE FROM ADVANCING FURTHER PASSED THAT BENCHMARK is so backwards and senseless that it blows my mind.
>>73537835
Sorry to break it to you, but two digits are not considered large either. It's not feasible when you do actual large numbers. For example, I can add 8 digit numbers in my head using the same method of jumping to power of ten's inductively, and it'll take about 10-15 seconds max. Kids won't be able to do that obviously, which is why they need to learn early, starting with smaller numbers.
>>73538732
>engineers need to solve problems with their heads
Yeah, and professional construction workers need to build houses without power tools.
Fuck off.
>>73537510
>shows how to make a ten
>how to make a ten
>make a ten
>make a ten
>make a ten
What the FUCK does this even MEAN????
Everyone responsible for this should fucking hang! Holy fuuuuuuck
>>73537823
>The point of the exercise was to practice mental math
>Math has gotten so bullshit now that you get marked down if you don't and DO show your work.
We truly are creating a generation of future engineers who will love math.
>>73539220
Leave the guessing to sociologists.
>>73534504
>tell how to make
>tell how to make
Is this ebonics?
At least say how "How could you reach 10 using addition and subtraction and the numbers 8 and 5".
Jesus fuck - the question doesn't even provide parameters.
>8x5 minus 10 minus 10 minus 5 minus 5 = 10 k thanx
This is a Jewish scheme to lower the intelligence of white children so that they are as stupid as black children.
>>73539263
Easier said than done when you have a country that can be literally hundreds the size of a stronger Asian or European country population-wise with everyone spread all over the place.
>>73539046
No it isn't. He would be marked down because he got there a different way.
>>73539105
and the calculations (s)he was teaching were precise, end of story. i agree that all of the other pictures are bullshit, but this one is spot on for teaching people to quickly perform mental math of large numbers.
>>73538660
could be worse.
>>73534239
I hated estimation so much when I was in school because it over complicated such a simple concept and then treated you like a retard.
>>73539105
Engineers estimate constantly, and plan using others' BEST estimates. https://en.m.wikipedia.org/wiki/Engineering_tolerance
>>73537899
So Common Core math is getting kids minds used to breaking down problems into many more smaller pieces so they can do Calculus more effectively?
I never did Calc.
>>73534239
STRAIGHT FROM REDDIT.
>>73539274
lol no you can't
>>73538740
lmfao its funny to think that with that sort of logic you actually wouldve failed common core.
no offense but how can you be this stupid?
>>73539144
well no shit you need to be smart to do actual college math. i got a 4 on my ap calc exam but that shit doesn't mean im good at math.
>>73539016
yeah but you arent thinking about it from a mental math perspective.
lets say you need to add 357 + 308 in your head really quickly which im assuming is the ultimate goal of this common core stuff, which is increased speed and efficiency in the long term.
if you want to do x + y = z ok sure some people can just instantly say 357+348 = 705.
but the way we would've most likely learned it without common core, youd have to think (ok carry over the 5 , then carry over the 1, etc.
i'm not that smart so I would have to think it out and or just draw it out which im sure anyone can do.
but with common core it becomes alot easier, all you need to do is take 2 from 357, so then you end up with 350 + 350 + 5 = 705. you can do that shit so quickly in your head you dont even need the calculator
>>73535749
My brain does this automatically.
This isn't the sort of thing we teach children here because each kids brain will have a different way of handling fundamentals.
>>73539274
I can add 8 digit numbers in my head and I was never taught how to do it in school.
You can simplify the problem in your head at every step to just be two digits max. Retards like you are why I always got marked down for "not showing my work." Piss off Mr. Nelson.
does it have to be common core math?
Guy who's wife is a 3rd grade teacher and helps her grade papers here.
Some common core shit is retarded, I know. But all these images you guys are posting aren't fair. You need to know the context of the problems, you don't have that when you cut out the heading. For the 8 + 5 problem, that whole sheet is probably an exercise on estimation and grouping. Like if I said hey what's 385 plus 253? In your head you would probably do 300 + 200 + 80 + 50 + 5 + 3 or something similar, instead going uhhhh ok 5 + 3 is 8 and 5 + 8 is 13 ok so 3 and carry the one... But young kids have to start with one digit numbers where it doesn't make much sense to group things or estimate yet since (to us at least) it's so easy.
>>73534239
/Pol/ I really expected better from you all. Common Core is not as bad as you make it out to be. Did you know that Common Core does NOT make or publish textbooks, workbooks, or questions of any sort? Have any of you actually read through the Common Core standards?
All you posted was a question without any context (Though it does appear to be from a unit covering estimation). If anything the biggest problem is that Jew publishing companies all jumped on the common core bandwagon and pushed out textbooks as quickly as they could for ultimate shekels. This is were a lot of misconceptions have arisen. I invite you to read through the common core math standards, and find something wrong with them.
http://www.corestandards.org/Math/
>>73535749
What the fuck? In this situation it's obvious to make 26 + 17 into 36 + 7, not 30 + 13
>>73539116
>Yes, solve them.
>Not guesstimate 'close enough'.
if you looked at the picture i linked you would realize that there was no "guesstimate" (that's a word made by liberal arts professors).
>They should teach children to do math correctly on paper so that when they're 21~ and sitting in University, they don't need to learn how.
the student already learned how to do it on paper. now the student is supposed to learn how to do it in their head
>They should be able to do this "Common Core" math in their heads instinctively, and I am sure most could, like the rest of America and Europe could do it before this stupid education policy was implemented.
that is the point of the lesson. this one is not a common core lesson.
>All this does is retard the education of smart and average students so that Demitirius doesn't feel left.
*tips tinfoil hat*
>>73537296
Triggered by my own kind
>>73538672
dont worry they're retarded shills
they'll repeat anything they learned from buzzfeed
>>73537899
>i was AP calc
>>73539143
look at the picture! there is no estimating invovled! christ you people
>>73537063
This thread is gold
>>73539642
So basically common core was designed by retards for retards
Except the latter has some potential to learn how to properly approach maths
>>73535930
Basically they want you to start with 20 plus 10 and then 6 plus 7 and add the two results.
Not disimilar to how we learned in school. Just not in this confusing and retarded verbal way. We simply do it visually. One number over another, right to left, with carry over remainders.
They did it that way for a hundred years without issue.
>>73537129
Whoever made this question obviously does know how many pieces are created by one cut.
>>73536310
I'm not retarded so my brain would automatically estinate the correct answer. Probably should have used a much larger number.
>>73539642
>But young kids have to start with one digit numbers where it doesn't make much sense to group things or estimate yet since (to us at least) it's so easy.
I disagree with this claim. Generations of Americans before Common Core can estimate large sums just fine, without having to explicitly practice estimation on something as simple as 8+3.
>>73539206
yeah i fucked it up. but still i think you knowwhat i meant.
unless you want to get hung up on completely discrediting me based on a typo
>>73539688
>>All this does is retard the education of smart and average students so that Demitirius doesn't feel left.
>*tips tinfoil hat*
You mean like when one of the writers of Common Core admitted that's EXACTLY what it is?
https://www.youtube.com/watch?v=LQ8Nr3_2724
Kill yourself, fuckhead shill.
>>73539640
>#5 and #6
wake me up
>>73538211
You sir are a fucking idiot.
I get the principle of common core but fuck the execution is so bad. Any traction at all to dump this shit?
>>73539640
holy shit that fucking indoctrination
>The wants of the individual are less important than the well-being of the nation
straight up tyranny nigga
>>73537899
What was the requirement of AP calc again?
Doing well in Math 11?
Do they want everyone to become cashiers or something?
I work in a relatively maths intensive field and I literally haven't done any maths without a calculator in 10 years.
>>73539998
im a retard, what's wrong with this image?
>>73538060
If i punch you in the face, does it matter if i throw an uppercut or a hook?
Of course it doesnt cuz the end result is the fucking same.
>>73534504
>then add 3
>>73539642
>In your head you would probably do 300 + 200 + 80 + 50 + 5 + 3 or something similar,
no i fucking wouldnt. i would do 385+253 becasue im not a drooling retard, faggot.
>>73538211
Are you retarded?
>>73539288
bad analogy. power tools and mental math are not analogous.
>>73539372
by that logic, then leave the teaching to teachers
>>73539411
but your way is the exact way the teacher wants the student to perform the calculation...
In my brain I would put the 308 below the 357 and then add down 6,5,15 and then bizarrely add the 1 back to the 5.
665.
When writing it down I would work in the reverse order. I wonder if that's to do with the direction we read in...
Is thay why Asians are better at maths!?
>>73540026
>Any traction at all to dump this shit?
Donald J. Trump
>>73540011
the exercise isn't a common core exercise. all the others are though.
>>73539456
no but a common problem is that people fall behind in math at an early point in their mental development and develop a "math phobia".
this prevents them from even trying for fear of failure and looking stupid and they just end up falling more and more behind in math.
will this mental math help you out in calculus? maybe(probably) not.
but atleast you will (hopefully) learn math with these common core tricks and not give up half way through division so that you can actually have the confidence to realize that math isnt that hard.
>>73537396
leave it to a canuck to know about cutting wood
>>73539685
In muh head it's 30+13
>>73537873
>implying it's not
just not the kind you're thinking
>>73537129
This is right, though.
10/2 = x/3
2x = 30
x = 15
>>73539615
Thanks for illustrating you are retarded.
>I'm not that smart
You aren't. The common core stuff is literally the x+y = z example I put up there.
The things you do to one number, as long as they are done inversely to the other number retain equivalence.
5 + 5 = 10
x + x = y
(5 - 3) + (5 + 3) = 10
(x - z) + (x + z) = y
Telling kids strategies to do mental math like this is fine, but enforcing them to do your stupid pattern because you like it best is retarded. You can do it a plethora of different ways.
The way I learned how to do that math problem is to solve the problem, but I can also solve it in my head which is different from how I would solve it on paper and how they would tell me to solve it.
( 8 + 7 = 8 + (8-1) = 16 )
+
(40 + 50 = 90)
= 105 + ( 300 + 300) = 705
I don't find the nearest number, I just separate every tens spot and add all that together. The only number that will ever not be a tens is the last one, so it's very easy.
Unfortunately my way of mentally doing math is wrong because I didn't subtract by 7 then add them, so despite the fact I exemplified that I understand the process behind addition and the rules of it and how to creatively use those rules, it's wrong because I didn't do what the teacher said even though my answer was right.
Best way to teach children.
>>73540065
The trapezium has impossible dimensions.
Question. If this will become the new standard for education, will we become a 3rd world country by the end of the century?
>>73540248
>bafflingly stupid one-lingers addressing nothing in previous post
Can't tell if a genuine shill or actually on the autism spectrum.
>>73540389
it's one cut versus two cuts...
>>73540253
Only thing that triggers me to be honest.
>>73539640
What in the actual fuck is this bullshit?
>>73538109
This. The way each person does maths is pretty unique to them and doesn't need to be standardised.
>>73540253
I would flip fucking shit if my kid came home with that garbage. Tax dollars hard at work subverting our children.
>>73537899
>oh yeah just incase anyone wants to know i was AP calc.
You sound so proud of that it's funny
>>73537063
Wait, what exactly is the "right" answer here then? Are you just supposed to say that it isn't possible or what?
>>73539959
This.
The systems we had in place were only a problem when blacks and mexicans made up a large chunk of your population.
The problem isn't the math or the teaching methods, it's the students.
Every other country with higher math scores uses fairly traditional systems, except Japan which uses a weirdo method.
>>73540065
You can do the standard shortcut math to get the answer but the real issue is that the shape as described is impossible once you figure out the measurements.
>>73540508
Of course he's a shill.
He's earned at least a dollar in this thread alone.
>>73534239
So the excuse for this is that some faggots do it "their heads" like this.
Do they also still teach the column addition since it's cleaner on paper?
>>73540253
Stop it. I'm actually upset enough to choke a fucking kike to death right now
>>73537296
90% sure this is all just sexist bullshit
these teachers probably turn around and brag about ruining young boys educations on tumblr
>>73539428
Didn't people bitch about how the American education system should be more like Finland's?
>>73534239
>>73537510
What the hell is this shit? I have never in my entire time in school seen anything compareable.
>>73534239
>american education
>>73537129
There's not enough information here to determine if that's correct or not.
>>73540508
there's nothing to address. that particular exercise is logically sound, is not common core, and has been taught for hundreds of years.
all of the other exercises are fucking terrible. common core is terrible. but the originally linked picture that i commented on is not a common core exercise. you are caught up on the common core red herring.
>>73540118
explain how you "just do" it, faggot. You're probably one of those autists that pretends like they're drawing in the air.
>>73539998
>>73539640
Common Core does not publish, make, or distribute textbooks, workbooks, or questions of any sort. Publishing companies may claim that their material covers Common Core standards, but it's no guarantee. All these examples are just cherry picked, they may not even have anything to do with Common Core.
>>73539998
Does anyone have the image where they showed the solution to this?
>>73535749
>>73534504
>>73534239
>>73534239
The fuck? When was common core implemented? I don't remember doing any of this shit during the Clinton era. Is this why kids are retarded this day and age?
>>73540804
>not having 'D: niggers and carribean spics have no control over their base emotions'
>>73537089
>As a white male in this society I've been given a lot of privilege that I didn't earn
>entire audience laughs at him
>>73537063
Its like fucking trollface made a math test
>>73534239
I can tell there is an erased answer, what is it? All I can see is "No, because 75" but I can't identify the rest
>>73540065
If you look at the right angle triangle formed from the edge of the trapezium (8) and the vertical (5) and find the bottom using pythagoras (square route of 39, ~6.24). If we put this info together with the top length (12) we get the lovely calculation 16 - 6.24 - 6.24 = 12 which shows that 12 = 3.52.
My brother brought home some paper before with some shit like this written on it. He was struggling and didn't get it so he asked me to help and I was confused as shit by it.
I just taught him how to cross multiply fractions to solve the problem and he got them all right and understand exactly what I had taught him.
He went to school and the teacher literally threw his paper away and told him it was trash because he didn't do the problems right. I wish I was making shit up on 4chan but that happened. It made my mom mad so she complained to the principle. Luckily, the principle made an agreement with my mom where his work would then be graded by the principle and not the teacher and I just taught my brother math that year.
He did fine on the standardized test. This system is fucked. I would suspect it's to try to raise the scores of dumb poor youth but that is the demographic my brother comes from and he actually performs fine when you teach him math like a mathematician and not some stupid fucking retard who wants "no child left behind so treat everybody like they are brain dead thus making simple things complex."
>>73534504
8+5 = 13
8 + 5 = 13
8(!) +(!) 5(!) = 13(!)
IT IS NOT TEN.
IT IS NOT TEN FOR FUCKS SAKE.
>>73540447
what the fuck are you talking about lmfao
>( 8 + 7 = 8 + (8-1) = 16 )
+
(40 + 50 = 90)
= 105 + ( 300 + 300) = 705
that just seems so much harder than 350+350.
not saying that they would necessarily teach it that way but there's definitely a less incorrect way of thinking about arithmetic and it just seems to me like common core is teaching the less incorrect way of thinking.
why are you guys so hung up on common core inhibiting arithmetic?
literally nothing about multiplication or subtraction allows for any creativity at all. this isnt fucking college math its just a toolset that you need to develop to make it through school and people are complaining about not being able to express themselves through this very cut-and-dried toolset.
>>73540029
But...that's literally objectively correct? It's only #5 that's scary shit.
>you must obey government officials
>>73540640
I'm not sure.
See, same size pizza means smaller slices for Luis...but he still ate more in total.
Marty having a bigger pizza means he ate more than Luis while eating less total slices.
I don't fucking know. Someone explain it to me.
>>73536398
Yup, this is the process for mental math. It doesn't make sense to do it on paper because you're not trying to balance all the digits in your brain's memory, you've got the paper to store that information.
>>73534239
>>73534504
>>73535749
It's ironic, if this was a question of how can you logically and theoretically derive a number from an instance of numerical operations, then they would be correct.
But they make it so that it's numerically correct.
Shit man I use to do that shit and I asked teachers all the time why the fuck would I estimate if the answer is right there. Once I hit high school half my teachers were from outside the country and told us common core was bullshit, while teaching us correctly. That's why when people take college entrance exams they'll get placed in remedial and be forced to pay more for classes. Luckily I didn't end up that way thanks to my questioning.
Fuck this country.
How does common core compare to how chinks teach math?
>>73541167
>literally nothing about multiplication or subtraction allows for any creativity at all.
https://en.wikipedia.org/wiki/0.999...
>>73540253
>that brown spic finger
>>73541062
>It's to try to raise scores
It's because people don't seem to get that if you fuck up math in elementary school, it's because you're a retard or you aren't even trying. So they make the lessons more and more ridiculous and dumb down standardized tests.
>>73541062
Why does if matter how kids do it in their heads? If it works it fucking works. They aren't teaching them math any more. They're teaching them to follow orders.
>>73537243
> let's dispense with is fiction that the gubmint doesn't know what it's doing
>>73536857
>>73537619
>>73537626
Hillary wants to keep it, Trump wants to get rid of it
>>73534504
This shit is almost Orwellian.
2+2=5
Gotta start the programming early.
>>73539450
you get those estimates by learning math and then estimating based on experience and learning to estimate
you don't start off estimating for fucking subtraction
>>73540044
you didnt need to be smart to be in ap calc but you just couldnt be a retard.
>>73540182
according to some people in this thread it doesnt matter how you solve it as long as you solve it. its better to be able to think creatively in these situations since we all know that math at the arithmetic level is about creativity and expression and creatively solving addition problems
>>73540253
What is wrong with this?
>>73540447
grouping by 10s is gay a fuck. and shouldn't be taught as the standard way to solve math problems
>>73534239
Anything 5 and over must be rounded to the next number. 70 is a wrong answer since it should be rounded to 80 do to it being 75.
>>73539117
>>73540094
see
>>73539069
End result wasn't the point. Knowing and understanding the math behind the problem is more important in this case than the answer.
In the case of >>73540094 fight, the result wouldn't be the same either. An uppercut would do more damage to the jaw, while a hook would do more damage to the eye and nose. So there, not only did I teach you about math, but I also taught you the difference in punches. Now go be a faggot somewhere else.
>>73541597
"in a state militia"
The 2nd amendment guarantees the right to bear arms for ALL citizens. The bullshit books claims it's just the military that's allowed to give citizens arms.
>>73541465
One of many reasons neocucks like Paul Ryan and jeb! Don't support him.
>>73534504
>>73535749
>>73537063
>>73537129
>>73537209
>>73537296
Explain yourselfs Ameriblobs
>>73538211
And the teacher still got the answer wrong.
>Muh inability to do basic math.
The newAmerican is being trained to be a retard.
Welcome to the third-world.
>>73540988
Haha I love this image, where did you get it? Mind if I save it??
>>73539543
Not all of us learned from our drunk grandpappys :)
>>73534621
Maybe. But when asked if the correct answer is reasonable you should not be demerited for answering 'yes.'
>>73541325
Literal meme maths for the types of faggots who watch minecraft streamers on youtube.
>>73541728
The SATs nonsense is nothing compared to Common Core
feels good lad
>>73535749
this is okay desu. It's just trying to encourage mental maths, albeit in a really silly roundabout way.
>>73538226
This is the part that confuses me.
Remove the constraints and I can give you a ten thousand page answer that reaches 10.
No wonder Americans are fucking failing at math.
>>73539631
>teacher asks you to show work
>dont show work
>HURR DURR DURR THE SYSTEM IS BROKEN
Holy fuck. Also, your method of simplifying is exactly the fucking point of the exercise, and also what I was talking about. So good job there
>>73536688
No we had this discussion m8... we're not bringing wat back.
>>73538211
what. 4/6 IS less than 5/6.
>>73537063
We have to assume that "Marty ate more pizza than Luis." to be true if given as true and can in practice be true...
>>73540988
haha le epic trollface meme
>>73537296
:0
oh NO
>>73534239
>this thread
>>73541925
It is stupid. I figured out how to use numbers in my mind during the first few minutes of calculation in the math-lesson.
Is the standard Nigger even too dumb to calculate in his head?
>>73538211
>
>>73539006
I understand you're british, so this must be hard for you. In the US, we do not use the verb "take" to indicate subtraction.
>Take 2 from 5
5 = 2 + 3
>then add it to 8
8 + 5 = 8 + 2 + 3 = 10 + 3
>then add 3
10 + 3 = 13
I'm sure that this lesson sounds weird for someone coming from an outside perspective, but it probably makes sense in relation to how she taught the class. She's just teaching them short cuts with addition.
>>73541728
>believing those are actual common core questions and actual teacher notes
Back in 2008 no one would have believed that shit, but here on /pol/ you seems to eat that shit up without second thought.
t. science teacher
>>73539631
For real FUCK Mr Nelson, always marked me off
>>73542189
Ahh! You called me Picard!
>>73542191
yes
>>73541586
>math at the arithmetic level is about creativity and expression
I hope you're joking.
>>73541698
https://math.berkeley.edu/~gbergman/misc/numbers/ord_ops.html
I read it as
__48__
2(9+3)
>>73538249
>How many fingers am I holding up Winston?
> The number "4" triggers Xernueqa, who was molested by a white male relative on the 4th of the month. If Xernueqa asks you what "2+2" equals how do you respond? Show why come 5 is 2 and 2
Since we're talking about maths, do you lads have Kumon in your countries?
