Common core

>>8878733
The test was clearly on estimation.
Smartass kid deserved to get it wrong.

>>8878739
103 ~ 105
28 ~ 30
105 - 30 = 75

>>8878750
Jack's error was that he forgot to subtract 10. He did 427-306, the vapid cunt

>>8878750
This is just a parent that wanted to show off his degree. If he put any effort into that problem it would be pretty easy for him to solve it (if he was as smart as he claims).

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This one really fired up my neurons

>>8878793
OP's pic was just the teacher being a cunt, the second one was a parent wanting to flaunt his degree, this one is just the teacher being flat out wrong

>>8878733
Everyone seems to be hating on common core, but these methods they're teaching is exactly what I'm doing in my head.

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>>8878739
>>8878733
Why do Americans do this to themselves? Why do you guys even teach this shit?
What exactly does a student learn by just doing as they're told? Rather than doing what's right. Pic related

>>8878814
>What exactly does a student learn by just doing as they're told?

To become an obedient worker without critical thought?

>>8878814
For that exercise, it's silly with those numbers, yes, but it's to teach the concept. There are situations where estimating quickly makes sense instead of working out a tedious problem with large numbers

>I have 187.44 in my checking account til I get paid tomorrow
>I need to buy ~$30.00 of gas (actually my tank holds $31.23 worth)
>Do I have enough money to pay my $149.77 bill?

>>8878809
I barely passed with 37% maths and I think your retarded
>>8878823
Obey! Obey! Obey! It explains the liberal crisis

>>8878750
>solve 427 - 316

Proof that whoever is designing these questions does not even understand mathematics.

You do not solve 427-316. That is just a number. You, at best, find its standard representation. The word solve should be restricted to problems like x+2 = 5 but even then what is being asked is that you find the elements of the set [math] \{x \in G :x+2 = 5 \} [/math] where G is a group.

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>>8878814

>>8878733
is this american maths?

>>8878826
>I barely passed with 37% maths and I think your retarded

Have you ever thought that the fact that you're retarded has affected your judgment on other peoples' retardation? Because I use the same method and I'm not bad at math, like you.

>>8878825
I was never taught ever how to estimate in school. Estimating is pretty simple and a child will figure it out on their own when they're older. I think their just wasting their time
>>8878786
>>8878808
I'd be a cunt to if I was paying for my child to be brought up as if he was a "gifted" child
>>8878837
Damn you

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>>8878793
10 minutes as ε→0

>>8878750
I don't understand what's going on after subtracting three 100s what is the 107 97 87 77 67 57 between 121 and 127?

>>8878808
>>8878793
How is this wrong? 10/2=5 minutes per piece
5 minutes * 2 pieces = 10 minutes
5*3=15 minutes
5*4=20 minutes

>>8878907
>if she works just as fast

>>8878898
That's what the father wrote, he interpreted the -1 steps as -10 steps (and for some reason jumped straight from 127 to 107, not that smart it seems)

>>8878907
2 pieces = 1 saw cut = 10 minutes
3 pieces = 2 saw cuts = 10 + 10 minutes

>i fell for the bate

>>8878907
Because sawing one piece of wood into 2 pieces is the same action as sawing one of those two into a third.

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???

>>8878965
>I love common core now

>>8878973
see
>>8878793
It says right there that it's 15 minutes, I hope you can figure out the rest

x=56-34
x=60-30-8
x=22

>>8878793
>saw a board into 2 pieces
>saw ANOTHER board into 3 pieces

No information on species or dimensions of boards. Is the same type of saw being used?
Does workman fatigue come into play?
Is Mario in a union? Cutting the third board may take long enough to require a mandatory break.
Bitch might get pregnant hanging around a construction site.

>tl;dr not enough info

>>8878793
>post stupid math problem
>sell it as "common core"
guaranteed replies

>>8878988
>243-87

I mentally solve this by changing 243 to 200 and taking 87-43 = 44.
Then I simply take 200-44=156

But that seems cumbersome. I think I will draw a number line next time.

>>8878988
wtf I hate arrays now.

>>8878988
>1 '3 '3
The only reason the upper one is more intuitive to you is because you were taught that one

>>8878739
Perhaps the problem should have involved less precise measurements then.

>>8878956
Even brainlets should know what 'another' means.

>>8878988
I didn't grow up with common core, but the bottom is how I always do these problems in my head. Add to numbers until you make them a multiple of the nearest five or ten and make them much easier to solve. It has been so long since I've been in school that I kinda forgot how to do it the top way (though given all the information there I could likely work my way backwards through the process to relearn it).

>>8878988
That seems reasonable enough tbqh

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>>8878733
>common core math
For all non-Americans...
In America we have the "No Child left behind" idea. This means that schools and teachers are penalized for failing students. To fix this they are teaching the SIMPLEST way possible to do math. NOT the fastest or best, but the easiest. In America we teach to the dumbest slowest students. There is NO incentive to create many brilliant student only incentives to NOT produce a failing student.

>>8878988
People used to think the top way was convoluted and retarded too. People think that every time a new method is introduced.
https://www.youtube.com/watch?v=UIKGV2cTgqA

>>8879024
Well, teachers can not create brilliance either way.

What's worse in my opinion is that you do the same shit at university level. 30% failing is not unusual where I live, there are some exams with more than 50% of the people failing. Meanwhile I saw some stats from the US with an average of 10% failing, which is laughable unless 90% of the university students actually study and understand everything (which is hard to believe unless you make the exams really easy)

It makes me think there is a "everyone passes, but the grades determine how good you are" system in the US (which makes degrees kind of worthless), whereas here in Europe it's more a "only the good people pass" system

>>8879028
I thought "new math" was when they tried to teach set theory to elementary schoolers

>>8879036
Yeah.. We may have decreased the number of brilliant students we produce (fewer doctors, engineers, mathematicians), but we made DAMN sure our janitors can do basic math.

>>8879036
Pretty much. Almost any decent internship or program in the US requires a +3.5 GPA to even be considered.

>>8879059
This is false, if you have a 3.00 you'll be fine for internships.

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Should we nuke America?

>>8879024
if your education is so communism why is college so expensive?

>>8878733
define "reasonable". Because working in tolerances of whole numbers is for shitters.

>>8879100
What do children feel when teachers do this to them in america?

>>8879103
>if your education is so communism why is college so expensive?

Pre-college is generally free public education.
Specialized for the dumbest.

College is student pays.
Specialized for the smartest.

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>>8878980
We see the solution, and it's wrong

>>8879129
what if you're poor but smart?

>>8879160
>what if you're poor but smart?

Student loans are government backed and are set up preferring the poor.
There is little problem getting a college education in America for a smart poor person... the problem is paying off the loans later

>>8879160
Then pre-college you learn nothing cause you gotta wait up for the dummies

and college you just don't go cause you're poor or take our hella loans so you can be in debt after college

>>8878951
Can't blame him. Common core is rather arbitrary compared to the centuries old way of arithmetics

>>8878965
How do I know that the square is squared? Absolutely no information is giveb
>>8879028
So were gradually getting dumbed down? Thank you Jewish Overlords.

>>8879064
Yup. Also after your first job, that won't matter anymore - how well you "network" does

>>8878776
Wrong use of the word vapid

>>8879179
But he has extensively studied differential equations and other higher math applications. He should know, he's an electronics engineer.

>>8879103
Because of government defaults and loans for students. As student loans became a larger market, colleges realized they could hike up prices and get away with it. It's our biggest bubble right now.

>>8878750
Literally was on Reddit for a week and saw this got upvoted to the front page and realized it's 2brainlet4me.

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Ooga booga common core

>>8879114
I remember it feeling terrible.

>>8879114
http://www.foxnews.com/world/2017/01/18/gunfire-erupts-at-mexican-private-school-injuries-reported.html
I am sure it's fine.

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>>8878733
how many buckets

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>>8878907
It take 5 minutes to saw a piece of board into one piece?
It takes 5 minutes to saw one piece of board into one piece?
It takes 5 minutes to saw one piece of board into itself?
It takes 5 minutes to not saw a board?
It takes minutes to not saw a board?

>>8878793
How is this common core again?

>>8879100
yes please. Lets nuke it all and then walmart will buy up all the land and the entire us will become one massive walmart with numerous indoor mcdonalds

>>8879382
isn't that what it is?

>>8879064
This desu

>>8879114

They feel "huh I guess math is too hard for me"

>>8878743
103 ~ 0
28 ~ 0
0-0=1
How told you to round like that?

>>8878743
>lets round all constants to other constants for no reason

>>8878826
>Obey! Obey! Obey! It explains the liberal crisis
You have to be able to obey simple instructions if you wish to achieve higher learning.

Sometimes, some practical skills require a combination of smaller skills to make use of. When you're learning the component bits, you may not appreciate the utility of each, but combined you have something useful.

As far as discouraging critical thinking, the entire core of liberalism is freedom from traditional thought.

Compare with conservative conceptions of the role of education:
"Knowledge-Based Education—We oppose the teaching of Higher Order Thinking Skills (HOTS) (values clarification), critical thinking skills and similar programs that are simply a relabeling of Outcome-Based Education (OBE) (mastery learning) which focus on behavior modification and have the purpose of challenging the student’s fixed beliefs and undermining parental authority."
-Texas GOP
http://s3.amazonaws.com/texasgop_pre/assets/original/2012Platform_Final.pdf

All the criticisms of common core seem to come form a perspective that refuses to see any nuance in the world; that children might learn differently because they haven't yet developed requisite skills to understand the world as we do. Viewing all in black and white is what I expect from conservatives.

The point of
>>8878750
is less to teach someone how to subtract two numbers and more an exercise in building abstract thinking skill. It helps children to have a conceptual understanding of what it means to subtract one base 10 number from another.

>>8878956
What if she folded it up and turned it on its side? It would only be one cut then, so it'd take 10 minutes.

>>8878739
estimation...when you have the answer in front of you, that's when you don't use estimation.

>>8878793
kekerino

Common Core:
trying to teach introductory students some useful mental shortcuts for doing math faster...in a really unintuitive way that doesn't teach them WHY those shortcuts work.

If you ask me to add 78 and 44, my thought process actually IS:
>78 is 22 less than 100, so pull 22 out of 44 to get to 100
>how much is left? 44-22=22
>plus the hundred makes 122
and it is a lot faster than adding and carrying the old-fashioned way.

but it only works for me because I taught myself to do that, based on already knowing how simple arithmetic works, rather than having it drummed into me. these kinds of methods are better applied to tutoring sessions where they can be better explained, or to supplemental fast-math sessions in middle school that are intended to build on previous skills. trying to teach it to elementary schoolers who don't already know how to add is a very bad idea.

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disgraceful

>>8878733
making fun of common core is really just another reason we need common core

>>8879682
>what did he mean by this

>>8879017
And that's the point of common core. To stop teaching "methods" that'll give you the right answer but no understanding, but instead teach, or at least try and teach, how to think about problems.

Of course that will initially lead to worse results than if you just give people a cut-and-dry process, but in the long term it will give better results.

Of course parents in the US sperged out over it, not being able to see long term.

>>8879391
Basically, yea. We tout our democracy, but it's approaching aristocratic conditions, and the country is basically run by corporations.

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>>8878733

>>8878733
I got a good one for you guys. Just goes to show how stupid teachers are in north america
>Be in grade 1
>Teacher tells us to draw an apple
>I draw a green apple, I had one for breakfast that morning
>Teacher tells me I'm wrong, "apples are only red anon"
>I color red over my green apple, it becomes black
>I become angry because I know apples are green
>Decide to just make the apple look like a bomb, draw sparks coming off the stem
>Teacher sees, says I'm in huge trouble and shes gonna call my parents
>Mom comes in to see teacher, gets lectured on how bad of a parent she is letting her son draw bombs at age 5
>Teacher tells mom I'm going to grow up to be a psychopath
>Entire thing happened the day after 9/11
>My teacher thought I was glorifying the 9/11 attacks at age 5
>I was just a kid who drew a green fucking apple and now I'm considered a psychopathic terrorist by my teacher for the rest of the year

>>8879100
this gave me fucking Klinefelter Syndrome. I want to die

>>8879716
all of this thoughtfulness and logic is giving me a headache.
if it's not immediately apparent to me it's probably some NWO bullshit.

>>8879803
This definitely happened

>>8879036
At good uni's faculty usually give students that deserve F's, C's (in the US)

t. Grad student who grades at a top uni.

sometimes you gotta think inside the box or thinking outside the box wouldn't be special

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>>8880087
not at ALL good American unis
t. graduate of UChicago

>>8878739
>people should be punished for being better than what was required
literally communism

>>8878750
>be engineer
>can't recognize simple patterns
Jack subtracted 3 100's, and 6 1's but forget to subtract the ten. Even if it's a stupid way to do math, I would think a engineer of all people should be able to figure it out how they want you to do it

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Solve this without Common Core plebs

>>8879100
This was a legit exercise in critical thinking. Not everything you read from your teacher is true.

>>8880148
Is that possible to solve without calculus?

>>8880111
>belittle the engineer for not recognizing what Jack did wrong
>incorrectly describe what Jack did wrong
kek

>>8878743

103 ~ 105
28 ~ 25
105 - 25 = 80

>>8880175
if you are one of the three people who have memorized the formula for the area of a lune, then it's just algebra

http://mathworld.wolfram.com/Lune.html

>>8880188
>rounding by 3 to get 25 instead of by 2 to get 30
did you miss the whole concept of rounding in the first grade?

>>8879024
Some children deserve to be left behind.

>>8879114
I got mad at the teacher when they'd do that. I wouldn't yell, I'd say ok like a little bitch, but I always knew they were the one who was wrong.

>>8878988
why not count 1 by 1 from 87 to 243? it would be even easier to understand!

>>8878743
103 ~ 1000345768
28 ~ 1000345693
1000345768 - 1000345693 = 75

>>8878834
How is that a group? Under what operation?

>>8879024
>be me ~10 years old
>good at math
>solves problems ahead of schedule
>teacher forbid me to do more problems
>forces me to sit idle in corner until class ends
>ask her why
>"anon, other kids might feel bad if you are faster at solving problems than they are "

Sweden is a fucking shithole where knowledge is frowned upon

>>8880497
I got told to work on my social skills instead of studying maths once during maths class when I was a book ahead of the currycum.
Maybe I should have worked on my social skills, but the Swedish school system actually is cancer that only favours people who go to trade school for their high school education.

rounding to multiples of ten is arbitrary

i think we should always round to the nearest multiple of two, that way there would be less error

>>8879382
Reaching levels of sharting that can be compared with infinity x 2

>>8878996
I've actually always mentally done it the way common core teaches

757 - 68 = 757 - 70 + 2 = 757 - 100 +32 = 689

Of course with many numbers I do it traditionally though.

I don't know why you autists are sperging out with children being given another option.

>>8880525
i'd just do that as 757 - 67 - 1

>>8880529
That also works, but I prefer my method since counting up and carrying whole numbers is easier for me than remembering all the "borrowing" for each digit

>>8880529
>>8880525
>>8880535
Nvm that's not how I do it. It's so engrained into me I fumbled when trying to put it into words.

757-68 = 32 + 600 + 57
Occasionally I do it the other two ways announced but usually this is how I do it

>>8880099
>muh communism is just punishing rich people meme

>>8878739
It didn't at all say that Carole would "estimate" things or "round them". It asked for a reasonable answer, which is such a vague question that it's completely fucking pointless.

>>8879381
>>8878991
It isn't, this image was around before common core was even a thing.

>>8878988
This seems like a pretty reasonable way to teach kids, if perhaps not the fastest. The bottom approach shows better what subtraction actually is. The top approach might be faster but to a kid might seem like an arbitrary collection of steps that just happens to produce the correct answer without bringing any understanding, especially with things like "carry the one" that might be a little opaque at first.

>>8880563
>The bottom approach shows better what subtraction actually is.
You're missing the point. When I was taught basic arithmetic as a child, I was taught using marbles

i.e. 10-6 = 10 marbles, then you take 6 away

which shows how it functions, then being shown the most efficient way to do it afterwards. Teaching kids that they must do subtraction the common core way and punishing them for doing it a better way is stupid and will only hurt them in the long run.

>>8880518
I think we should round to the nearest real number, that way there would be no error

inb4 wildburger

>>8880148
monte carlo

>>8880497
>>8880504
There's similar shit in Finland too. The slowest and stupidest students dictate the pace. The talented get no reward / extra challenges, and might get punished instead.

After a few complaints and detentions for being too quick in math, physics and chemistry I had to pretend to be a IQ 70 vermin to survive.

Now in uni I actually get rewarded for being efficient.

>>8879633
That's many more steps than
>78 + 4 = 82
>82 + 40 = 122

Why would you go through all that trouble?

>>8878733
That is some bullshit right there.

>>8880891
it's more steps, but it's faster because it doesn't require carrying. at least for me.
the way my head works is notoriously weird, to listen to people who know me, but I have a hunch this issue with carrying digits is broadly true.

>>8879100
>reasonableness
REEEEEEEEEEEEEEEEEEEEEEEEEEEEE

>>8879114
Now I understand why there are so many school shootings in the USA

>>8879100
This is child abuse

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>>8880651
>tfw several years of calculus are made pointless by a single numerical methods lecture
Numerical methods is the one true math. Everything else is just puzzle games.

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>>8878793
the answer is 30 minutes

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>>8878750

Why are engie brainlets so desperately insecure about their intelligence?

>>8878814
>What exactly does a student learn by just doing as they're told? Rather than doing what's right

They are literally brainwashing kids into being wageslaves.

>>8880148

0.16280532330291242 assuming radius of smaller circle is 1. Simple trig question really.

>>8881669

0.5855250381213913, missed a 2 in the denominator.

>>8881669
>>8881708
How did you calculate that with just trig? I really can't think of other solution than using calculus at the moment (ignoring numerical methods).

>>8880200
What do the derivatives look like?

>>8878825

So you avoid doing the actual calculation and find yourself paying a bounced check fee, because the answer to being able to afford the $30 gas is "approximately yes".

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>>8881751

Connect things up like in the diagram. We can see by cosine law that theta = arccos((1 + 2 - 4)/2sqrt(2)) and so alpha = arccos(1/2sqrt(2)). Using sine law with theta or alpha we can see that beta = arcsin(sin(alpha)/2).

To get the red area we take the section of the circle of radius 1 with arc 2alpha (the red, green, and blue) and subtract of the green triangle of area sin(alpha)cos(alpha) and the blue section. How do we get the area of the blue section? Why its the sector of the big circle of arc 2beta minus the green triangle and the yellow triangle combined, which has area 4sin(beta)cos(beta).

We can generalize this to a big circle having radius R and small circle having radius r to find the area in general as well, but I'll let you try that.

>>8881888

Nice, I got a palindrome.

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>A common core thread without autistic retards derailing it with the /pol/ boogieman
What is this sorcery?

>>8881888
But can you differentiate it?

>>8879612
School isn't about getting the right answer. It's about learning. Estimation should be taught using baby examples like this where you don't technically have to use it so you can see how estimation helps.

>>8880175

Yes, in the sense that you allow for the use of circular segments/sectors/etc to be used, together with a good bit of coordinate geometry and trig. But actually /proving/ to a satisfactory degree that any of these basic geometry formulas that we actually use (like, say, the area of a circle) is the case, requires a little calculus and/or analysis or even a bit more, as a function of the level of rigor to which you insist on carrying the operation.

But it is true that if you allow for looking up the above sorts of formulas from tables/the internet without actually taking any limits, derivatives, integrals or anything of the kind, then yes, it is straightforward to solve the above problem without calculus. It's just slightly tedious.

The answer is a very (I say very, but not EXTREMELY) onerous thing involving several inverse trig terms IIRC, which can be collapsed down to a smaller degree.

Actually I liked solving the problem without calculus, and then testing that a solution using elementary calculus produces the same answer (it does). A good exercise in solving the same problem by two distinct methods.

>>8880175

Yes, see >>8881888.

>>8881888

Let f(tau, t) = t^2 (tau - sin(tau)cos(tau)). Then the area is given, in general, by f(alpha, r) - f(beta, R) where:

alpha = arccos((r^2 - 3r^2)/(r^2 sqrt(8)))

beta = arcsin(rsin(alpha)/R)

and we assume that sqrt(2) - 1 < R/r < sqrt(2) + 1

>>8881891
I read the fucking post several times trying to find the palindrome. I'm so ashamed of myself

>>8881708


You are wrong Anon.

The Answer is
>0.2416

>>8882111

How did you get that? With calculus?

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>>8881888
>>8881891
witnessed

>>8882067
I did the same too bro, feels badman

>>8878996
Really? That's how you do it?

I just do 243 - 80 = 163. 163 - 7 = 156

>>8878750
Frustrated Parent is a dumbass, the question is obviously looking for something like 427 - 316 = 417 - 306 = 411 - 300 = 11. CC math is stupidly taught, but has a strong basis in mental math. India has been doing this for years. Their kids can sit in a math class and do all kinds of shit in their heads while ours are still counting on their fingers.

>>8881855
Or you can not be retarded and realize that the answer "approximately yes" happens to be correct, so there wouldn't be a bounced check.

>>8881855
This is why we need better estimation math, so idiots like you can do shit in your head instead of taking up bandwidth.

>>8878988
if you do it mentally, it can seem a little bit easier but on paper it looks retarded.

>>8879114
Teaches don't actually do this to them
These are fake

>>8878739
you, and the teacher, should be literally executed

>>8881888
Nice. Thanks, I learned something.

>>8878733
Trick question;

Don't confuse reasonable with correct.

>>8883441
idiot, the correct answer is reasonable
he didn't get full marks because he didn't show ability to estimate before calculating

>>8879160
There are millions of scholarships given out all the time. If you are smart, you will apply for as many as possible and get enough to get by.

>>8878733
why is every country experimentating with their children
i mean take a look to germany the children in my state BW learn
to write what they hear WTF
>instead of learning the correct form they can write whatever they think but only in grade 1&2
in grade 3 (when the first marks are made) they get fucked for witing it wrong and they get bad marks

>>8878823
>To become an obedient worker without critical thought?
How does that benefit anyone?
An unintelligent worker is one that has to be constantly supervised.

>>8879103
communism is expensive

>>8878739
Nah. This is just a stupid way to phrase the question.
You could ask something like "is 70 or 80 a reasonable guess"? This is just fucking asking to confuse someone. What are you supposed to say? "No, 75 is not a reasonable answer. It's just the correct one."

>>8879114
That was the story of my entire scholastic career it was all my teachers and my parents each providing me with mutually exclusive lessons and constantly demanding that they were the ones that were right and all others were wrong so I never knew what to believe and ended up second guessing everything I thought I knew. On one hand it led to me being very naturally skeptical but on the other it led to me being terrible at math and lacking confidence in my ability to understand anything.

>>8879532
Mathematics at the level of addition is intrinsic to the human mind. You don't need to be taught it abstractly, for it is the basis of ALL other understandings. What you are implying what people should do is learn about things in a "simple" way so it's easy or some bullshit, but you are not helping the concept, only complicating it by taking something simple and intrinsic and trying to change it.

>>8878825
But all you did was a normal subtraction problem with limited information. If you knew it would cost 31.23 you should just actually subtract that number you retard.

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>>8878733
Estimate, using the calculus of residues
[eqn]pv\int\limits_{-\infty}^{\infty}\frac{e^{ix}}{x^2 + 1}dx[/eqn]

>>8884044
There is no way to quantify reasonable. Given both numbers, to me the only reasonable answer is the solution. There is no magical limits or things at play so how would anything but the literal answer be reasonable?

What if you try to pay at a store with a "reasonable" amount of cash?

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>>8878733
>>8878750
>>8878793
>>8878814
>>8878837
>>8878852
>>8878965
>>8878988
>>8879024
>>8879100
>>8879787
>>8881339
http://www.salon.com/2015/11/28/youre_wrong_about_common_core_math_sorry_parents_but_it_makes_more_sense_than_you_think/

/SCI/ BTFO

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This is how they teach kids to multiply. Totally intuitive, guys!

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>>8884565
Don't even get me started on how they teach division, because this literally looks like 23th root of 7418. What the fuck is this?

>>8878750
>extensive study in differential equations and other higher math applications
Holy fucking lmao this brainlet

in Ontario schools, from grade 1 all the way until 12, math homework/tests divide the problems into four areas.
Knowledge: basic arithmetic shit, 5*7=? etc
Application: word problems, "Muhammad has 5 dildos..."
Communication: Explain a concept to show you understand it
Thinking: Slightly harder question that kids need to really connect ideas for.

In my opinion it is a really good system, I don't know about the rest of Canada but most students here do well.
Do any other countries do it like this?

>>8878814
It's the goddamn liberals

>>8884565
>>8884570

I was taught the common core way, in France, in the late 80s.

Can't tell if it's better or not, but I really don't get the old American way. I could just draw the exact opposite picture, criticizing the old way that I don't get.

Yet, I won't, because I can understand that I'm just not used to it.

>>8884614
I think it's a joke the method described as "common core" in those pics is the way math was taught in america for decades, and the "old way" in the picture is common core

>>8884612
Wasn't No Child Left Behind signed by Bush Jr?

>>8884544
>The outrage is warranted, it’s just misplaced — this example is of the second type I mentioned above, in which the educator has misunderstood and misapplied the standards with an overly narrow literal reading of them.
Ah, I'm glad we sorted it out. It's not Common Core which is retarded, it's teachers who are too retarded to teach it!
Still fairly interesting that they didn't have problem teaching it old way. I wonder why...

>>8884660
>Still fairly interesting that they didn't have problem teaching it old way. I wonder why...
But they did.

>>8881888
I like you.

>>8881888
Wouldn't it be easier to find the area of a half circle and then subtract a segment (in your case, the blue portion) to make it a lune? I'm just assuming this isnt what you did, because I'm just not seeing it that way, and I havent gone thru the algebra myself.

>>8884565
>>8884614
The Common Core way is how they explained multiplication in old Soviet textbooks. Our teachers called what is called the "old-fashioned way" here the "peasant method", lol.

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>>8884565

Why not just memorize what a slide rule looks like?

>>8884570
>>8884565
theres no fucking way these arent memed up by some frustrated grad student

>>8878750
Dear Jack.

You accident skipped 117 on the number.

Pay no mind to BS in EE. He's a fucking retard.

Sincerely,
Anon with more than elementary level critical thinking skills.

>>8878907
The teacher assumed the problem is 10(x/2), but it's actually 10(x-1).

x pieces = x-1 cuts. The cut is what takes time.

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>common core is how most people do arithmetics in their heads despite being taught
>it's being taught to kids instead of letting them figure it out on their own
What did they mean by this?

>>8884565
Can someone explain this image/post to me? Is it a troll?

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>>8885406
yes, it's a troll
in the images, the 'common core method' are actually the methods that were taught in schools until common core

basically, it's backwards

i'm kind of surprised this should have to be explained actually

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>>8885406
It's not "a troll", it's reality. This is happening in our schools right now and the poor children are confused.

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>>8886190
This is how they add fractions now. Holy fuck.

>>8884609
dont generalize retard

>>8886190
Bullfucking shit, the abc-method (we used the pq-formula, tho) is basic 7/8th grade stuff.

Most of the Common Core is just another way of calculating it, and expressed somewhat shitty.

>>8880181
>3*100+6*1=306
>427-306=121, the exact number Jack got, which is off by 10
Wew lad

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>>8880405
kek

>>8880551
Like all "dumb math question" images, it's without context. It probably says "for questions 7 - 11, estimate by rounding all numbers to the tens place." above it, and we can't see it. Doesn't make it a good question, but it'd at least warn him.

>>8886196
This is mess. There is no way old-fashioned way uses new "common core" way of dividing.
Checkmate common corers!

>>8878814
They have the freedom to do so

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>>8878793
jesus christ

>>8880504
>currycum
not even close anon, but that's pretty funny

>>8878814
To turn them into good goyims. This shit already starts at childbirth when they're given circumcision without anesthetic.

>>8884612
>muh liberals
You mean Jews

>>8884565
In Finland we had the "common core" way to teach multiplication.

>>8878988
not adding 13 to both sides so that it becomes 256-100

>>8884565
>>8884570
This is how I was taught way before Common Core.

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>>8884565
I don't even know the top one is doing???

>>8890527
Tbh that is how I do math in my head

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>>8890532
It makes 2 digit squares in your head pretty trivial

>>8884570
>23th

Holy shit. I just started tutoring a 4th and 6th grader and came across one of these problems. The worst part is that it was multiple choice and if you actually summed the numbers without rounding, there was a wrong choice that was actually closer to the actual answer than if you were to round first then sum. Blatant Liberal/Jewish/dumbass subversion.

>>8878793
It would be 20. If it takes the bitch 10 minutes to make a single cut it would take just as long to make the second cut for the 3rd peice.

What a shitty example

>>8886196
>find the least common demoninator
>by primitive prime factorization
>or by just "guessing" a least common demoninator
Both approaches are brainlet tier

Go ahead and find the factors of large numbers like 77077 and 27027 with either of those methods

>>8890622
are you suggesting to multiply the denominators or something else?

>>8886190
Whatever happened to good old completing the square? That concept that Algebra is named for?