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I see no reason whatsoever not to expect people (including students) to express numerical data using an appropriate number of digits. It's simply a matter of using proper "numerical grammar." There may be no "right number of digits," but there are most certainly "wrong numbers of digits." I wouldn't and don't waste any time on "the rules for sig figs" and I would never penalize a student for using, say 2 or 4 digits to express a number that "the rules" would say should have 3, but I will continue to penalize them for using, say 1 digit or 6 or more in such a case.