re: 9+6 = ? "Our young learners might not be altogether comfortable..."

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I can do fairly complex calculations in my head and that is exactly the method I've used all my life.

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I get what you're saying. I do the same thing (for a basic example: what is 132 X 5, I'll do 130X5 + 2X5). There's a chance I'm wrong, but I really think that single digit number additions should simply be beaten into their heads until memorized.

And while my common core addition feelings are still open, I've seen the common core multiplication videos and it's absurd.

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I can do fairly complex calculations in my head and that is exactly the method I've used all my life. I'm glad to see it's been formalized.

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Adults, and advanced children/teen can do complex calculations in their heads but we didn't start out doing complex calculations in our heads. Instead, we were taught the basic building blocks and then, only after understanding those memorization building blocks, were we able to branch out and learn how to do complex calculations.

Common core is idiotic because it sees what higher functioning students are able to do and mistakenly believes that every student can immediately leap to learning the complex calculations without teaching them the basics first.

ETA: I have no problem with using common core methods in schools but not until the students have a grasp of the basics. You can't build a house without a foundation so why would anyone think we can skip the foundations of math without any problems?

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I can do fairly complex calculations in my head and that is exactly the method I've used all my life. I'm glad to see it's been formalized.

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yeah i have done the same. a lot of CC seems to teach my own shortcuts in math

note: when i'd have to go explain how i did problems and i used my own method, i would just confuse students and the teacher wouldn't ask me to do it again (nerd fistbump to myself)

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I can do fairly complex calculations in my head and that is exactly the method I've used all my life

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So do I, but it's overkill for single digit addition and I don't see where you'd save time later by learning this with single digits now. It isn't efficient.

Just learn to add single digits like that on the fly, and the process by which we do more complex problems in our head can be learned a couple year later (as it already is)

9+6=15....why do we need a new concept with more steps to learn this?

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I can do fairly complex calculations in my head and that is exactly the method I've used all my life. I'm glad to see it's been formalized.

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+1