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It's not really possible to define "common sense",
but it is a step now included in our school's teaching process,
that was not specifically included back in my day.
My G-daughters homework includes making an "estimate"
before working out the details of the problem.
So when they get an answer, they have a way to ask
if it seems "about right" or "makes sense".
Likewise, keeping track of the "units" in so-called "word" or "story" problems
is a helpful part of getting the correct answer.
I don't know how long schools have been doing this,
but I think these are great "innovations" in beginning math,
and can be used later on with more complex problems,
to avoid stupid blunders... like misplaced decimal points, etc.
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