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Is Common Core The Deebil? [Pic]

Over the past week, Ive seen this image multiple times on Facebook and elsewhere, a supposed denunciation of the Common Core version of math that kids are now learning:

That picture is especially popular onconservativesFacebookwalls and Im sure one of your relatives has said something about it, too.

On the surface, it seems ridiculous. The top makes sense; the bottom is silly;screw you, Common Core!

Except that the topdoesntmake sense, the bottomdoes, and the connection to Common Core is completely misunderstood. (Says this math teacher.)

Heres whats going on: The top is how most of us learned subtraction. Im sure your teachers taught you what was going on mathematically, but do you really remember what they said? Probably not. For us, its just an algorithm. You can do it without thinking. You hope theres no borrowing of numbers involved, but if you had to do it by hand, you could probably pull it off.

The problem with that method is that if I ask students to explainwhyit works, they'd have areallyhard time explaining it to me. They might be able to do the computation, but they don't get the math behind it. For some people, thats fine. For math teachers, thats a problem because it means a lot of students wont be able to grasp other math concepts in the future because they never really developed number sense.

Thats where the bottom solution comes into play. I admit its totally confusing but heres what its saying:

If you want to subtract 12 from 32, theres a better way to think about it. Forget the algorithm. Instead, count up from 12 to an easier number like 15. (You've gone up 3.) Then, go up to 20. (You've gone up another 5.) Then jump to 30. (Another 10). Then, finally, to 32. (Another 2.)

I know. Thats still ridiculous. Well, consider this: Suppose you buy coffee and it costs $4.30 but all you have is a $20 bill. How much change should the barista give you back? (Assume for a second the register is broken.)

You sure as hell arent going to get out a sheet of paper and do this:

Instead, youd just figure it out this way: Itd take 70 cents to get to $5 and another $15 to get to $20 so you should get back $15.70.

Thats it. Thats the sort of math most of us do on a regular basis and itsexactlythe sort of thinking the new way in the picture is attempting to explain. Granted that was an *awful* example to use, but thats the idea. If students can get a handle on thinkingthisway instead of just plugging numbers into a formula, the thinking goes, it'll make other math skills much easier to understand.





...or maybe it`s just being used as a political crutch?

submitted by: SmagBoy1
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Is Common Core The Deebil? [Pic]. ...or maybe it`s just being used as a political crutch?
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More Comments >

Laran
Male, 30-39, Australia
 190 Posts
Thursday, May 22, 2014 10:56:34 AM
cont.

I can accept the kids with real problems having difficulty.
Now I don't work in disability services anymore,
I have a higher expectation.
Peoples limbs depend on it.

Would YOU like to operate a Beam Saw or CNC with somebody that cannot perform proper maths?

Laran
Male, 30-39, Australia
 190 Posts
Thursday, May 22, 2014 10:44:00 AM
@dang007

Let me give you a little background on myself.
My stepfather is a retired Headmaster whose main subject was maths.
My mum is a school services officer.
I have 16 years under my belt training kids with disability fresh out of school.
Quite a few of those kids on pensions, did not need it, they were just never taught properly.

Quite a few of them ended up getting their asses of the pension, and into fairly high paid positions operating machinery.

Most people will perform a task in the first way they were shown, if given a choice.

It is very hard to break a bad habit once it has been cemented in them.
Teach them the correct way from the start, or else you are setting them up to fail.

A lot of these kids are not stupid, they just had lazy teachers.
The bad habits they learned at the start, stayed with them.

ba12348
Male, 18-29, Eastern US
 76 Posts
Thursday, May 22, 2014 10:17:35 AM
If this is how they are starting to teach math then advanced classes are screwed. Yes I agree it makes sense after it is explained, but look how much room it takes to do it on paper, try a calculus problem that way and you'll get tendinitis. Its probably the new "you wont always have a calculator with you" excuse, since that one is invalid.

dang007
Male, 30-39, Southern US
 585 Posts
Thursday, May 22, 2014 6:20:29 AM
>>> Vedic maths<<<

Sure simple multiplication of 2 single digit numbers.

AxB=10(A-(10-B)+(10-A)(10-B) This is the algebraic representation of the Sutra used for single digit multiplication. The second term on the right is the calculation done by using memorized single digit multiplication tables up to 5x5 while the one on the left is the difference carried out crosswise.

dang007
Male, 30-39, Southern US
 585 Posts
Thursday, May 22, 2014 6:05:35 AM
>>>>In my line of work, it would hold up an entire production line while some clown tries to figure out how many cuts to make. <<<<

totally misses the point. Of course after you understand the principles you use the quickest method applicable. But how to develop that level of understanding in the first place is the question. Or are you hiring 6 and 7 year olds in your line of work?

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