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[–] Aaaron ago 

I don't think you're actually looking at Common Core mathematics, maybe some other variation? But the actual common core is not an intuitive way to visualize the problems. It'll give them a problem like 415 + 580 and ask them to explain their answer through estimation. Of course the correct way to estimate would be 400 + 600 = 1000 but they'll tell kids to round down to 500 and say that 900 is a good estimate. This isn't intuitive or "rearranging" the problem in your head.

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[–] SpaceLizard 1 point -1 points (+0|-1) ago  (edited ago)

Can you give an example of a text book having students do something like that.

Edit I have two nephews that I help with doing math homework and I have never seen anything like what you are claiming.

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[–] Aaaron 1 point 0 points (+1|-1) ago 

http://libertyunyield.wpengine.netdna-cdn.com/wp-content/uploads/2014/02/Common-Core-math-mess.jpg

It's very possible that your two nephews are not being taught common core math, but I have no idea to be honest.