When that's the case, I do rejoice. I do not think everything ought be taught from the ground up, and when we actually have ready interfaces that do exactly what we need, that's great. I am not as confident as you that it's time to pitch that one just yet.
My ability to do long division is part of an ingrained understanding of proportion. You can argue that we need to figure out how to teach proportion better, which is fine, but my experience of humans is that they do not grab for tools as often as they actually need information.
In short, they need to make guesses without typing everything in. Long division was a big part of how I learned to make those particular guesses. Figuring out the first significant digit of an answer is a really big deal.
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My ability to do long division is part of an ingrained understanding of proportion. You can argue that we need to figure out how to teach proportion better, which is fine, but my experience of humans is that they do not grab for tools as often as they actually need information.
In short, they need to make guesses without typing everything in. Long division was a big part of how I learned to make those particular guesses. Figuring out the first significant digit of an answer is a really big deal.