I see what you are saying, but I think by skill and drill I was thinking more automaticity. Not that they don't know the meaning behind it, but that they can arrive at that meaning quickly. So your child, who can think through how to get to the correct answer, is still showing fluency with those addition skills to get to the answer. It is fine to arrive at "28" the way he thinks through it, but the idea with fluency would be that he can think through and arrive at that answer in a quick and easy enough way to be useful to him in harder problems. If he didn't have the fluency (automaticity) with those addition problems, he'd be sunk. In my grade, I hope they kid has the understanding to back it up, but they also have to know it quickly and easily enough for it to be useful and applicable to the problem 439 x 28. See what I mean? I think what Common Core is getting at is not to drill the child to death, but to have enough exposure and repeated reasoning that they can apply it to harder problems as they go.
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