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HereSince1628

(36,063 posts)

45. Not saying that you did. But elementary arithmatic is sort of foundational isn't it?

Fri Mar 7, 2014, 04:55 PM

Mar 2014

Last edited Sat Mar 8, 2014, 12:36 PM - Edit history (1)

Additionally, for kids with dyscalculia every manipulation is an opportunity for an additional error.

The vertical columns method for 32-12 = ? requires 2 subtractions to get the answer.

The approach used in the article uses 5...increasing the likelihood of a visual processing error and it doesn't lay any foundation.

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About That ‘Common Core’ Math Problem Making the Facebook Rounds [View all] pokerfan Mar 2014 OP

both ways work... both 'make sense' ProdigalJunkMail Mar 2014 #1

Yup +1 Adrahil Mar 2014 #3

I get it, but it does seem weird, as it is focuses on the concept 'difference' rather HereSince1628 Mar 2014 #68

I am very old but I was able to figure out the logic of the bottom example Gothmog Mar 2014 #72

That is how I think about arithmetic (though don't write it out) cthulu2016 Mar 2014 #2

but how do you know... lame54 Mar 2014 #24

If you work with numbers a lot fried eggs Mar 2014 #49

Continuing the conceptual work Ms. Toad Mar 2014 #76

It is a horrible example to show the technique exboyfil Mar 2014 #4

When I do it in my head Vashta Nerada Mar 2014 #5

How is 37 5 away from 142? Madam Mossfern Mar 2014 #7

37 is five away from 42. Vashta Nerada Mar 2014 #20

In my head, I would do it as follows pokerfan Mar 2014 #12

The problem is when teachers ONLY teach it the common core way joeglow3 Mar 2014 #25

And therein lies the problem with The System, kentauros Mar 2014 #65

It is an educational fad AngryAmish Mar 2014 #66

Oh, I agree that good teachers know multiple ways to solve these problems. kentauros Mar 2014 #71

I just subtact 30 first, then 7. Or vice versa. n/t cui bono Mar 2014 #23

Then there's the MFM approach pokerfan Mar 2014 #42

I would do fried eggs Mar 2014 #50

I guess I'm just too old. Madam Mossfern Mar 2014 #6

That example is horrible. Control-Z Mar 2014 #19

That's the old way mathematic Mar 2014 #26

That's how I do it, too. amandabeech Mar 2014 #67

That's an extreme example, used for emphasis of an agenda... Wounded Bear Mar 2014 #8

Common Core does suck because it treats all kids the same and dismisses kids who struggle. liberal_at_heart Mar 2014 #9

I used to struggle in school. I just don';t think like other people hollysmom Mar 2014 #16

I've heard that it's the opposite Renew Deal Mar 2014 #74

I have a son who is struggling through public school. He is autistic and in special education. liberal_at_heart Mar 2014 #77

the late nobel-winning physicist richard feynman had a great story about solving math in your head unblock Mar 2014 #10

It's division to 100 decimal places jsr Mar 2014 #14

there we go. he was also a much better storyteller than i am.... unblock Mar 2014 #15

In this example its quicker to count down from 32. GeorgeGist Mar 2014 #11

I like the Reddit example in the article. One that isn't quite so obvious with large number Pretzel_Warrior Mar 2014 #13

Well now that's better sharp_stick Mar 2014 #17

It is a question of discipline, not math Vox Moi Mar 2014 #18

Please check the pop-psych at the door mathematic Mar 2014 #36

Very conservatively said, sir! Vox Moi Mar 2014 #47

Foiled again by Google-U mathematic Mar 2014 #54

Gee … and I was just guessing Vox Moi Mar 2014 #58

As a political scientist with two MAs (MA in Political Theory, MA in Communications)... Chan790 Mar 2014 #64

Question about algorithms Vox Moi Mar 2014 #55

Yeah, that's fine for an algorithm mathematic Mar 2014 #56

Is there a term for this kind of Algorithm? Vox Moi Mar 2014 #57

Indeed there is mathematic Mar 2014 #63

Okay, I am now officially old. cui bono Mar 2014 #21

IIRC, the idea with this approach is to massage the problem you have into math facts winter is coming Mar 2014 #28

Oh! I see. Thanks for the explanation. cui bono Mar 2014 #29

The controversy is that it's different and some people have never thought of it that way. winter is coming Mar 2014 #32

The suggestion is that a student could explain the bottom ex. not the top. HereSince1628 Mar 2014 #38

I never claimed that it did construct foundational understanding. winter is coming Mar 2014 #40

Not saying that you did. But elementary arithmatic is sort of foundational isn't it? HereSince1628 Mar 2014 #45

I get it, but WTF? nt Demo_Chris Mar 2014 #22

The worst part is some 4rd grade teacher will fail a student because they use the core method liberal N proud Mar 2014 #27

People's brains work differently. Some people learn better visually, some aurally... cui bono Mar 2014 #30

I went round and round with the teacher on that and my daughter lost. liberal N proud Mar 2014 #34

It's not some 4th grade teacher. It's the Almighty Test. If the child, on the Almighty Test, Squinch Mar 2014 #60

Are the conservatives going to use this pic for their post about English? cui bono Mar 2014 #31

For everyone who doesn't get this Proud Public Servant Mar 2014 #33

But you are taught to borrow. cui bono Mar 2014 #35

Yes, but my point is Proud Public Servant Mar 2014 #37

The concept of borrowing flows naturally from the understanding of placevalue mathematic Mar 2014 #39

Right -- and leads you to the concept of place value Proud Public Servant Mar 2014 #41

not everyone thinks, or learns, in the same way jobendorfer Mar 2014 #43

Wittgenstein would like this example. Number games instead of word games aikoaiko Mar 2014 #44

People who use math all the time will develop their own strategies. They should teach the old fried eggs Mar 2014 #46

"teach the basics and let people come up with their own shortcuts." kentauros Mar 2014 #70

In stats we do something analogous by having students learn the.... aikoaiko Mar 2014 #48

We are so accustomed to base 10 central scrutinizer Mar 2014 #51

All I will say is I am glad I don't have kids nadinbrzezinski Mar 2014 #52

I don't even think about that subtraction problem. MineralMan Mar 2014 #53

The common core does suck. Here in this thread, there are about 20 people, talking about Squinch Mar 2014 #59

Both are really bad ways to teach children to subtract. Donald Ian Rankin Mar 2014 #61

...and people wonder why I will never send my kids to public school. Chan790 Mar 2014 #62

That method seems needlessly complicated to me alarimer Mar 2014 #69

I think what they're trying to do is to break up the numbers to the nearest 5s and 10s. kentauros Mar 2014 #75

That just shows you how you could do it in your head treestar Mar 2014 #73

The idiots on other boards are simply too stupid to understand the concepts involved Gothmog Mar 2014 #78