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

Teachers used to teach the mathematical concepts, and clarified them with examples and small algorithms you could do in your head.

Under common core, teachers teach the examples, and assume that students understand the underlying concept.

This is why common core math is bad. It promotes reciting instead of understanding. It's also why common core maths can promote brainwashing, despite being maths: it discourages thinking.

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

That's actually the exact edit:opposite of what is happening. With the old way teachers only taught the basic algorithms. They didn't clarify what was actually happening with those algorithms, they just taught us to use them because they worked leaving most kids clueless as to what was actually happening. What I've seen in the math portion of common core is the teaching of how to conceptualize math problems so kids actually know what is happening before teaching them the method to get to the answer fastest.

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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.