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I emphasize sig figs to my intro level students, both majors and
non-majors, so that they do not just blindly report all of the digits
their calculator gives them.
generally if one reports a measurement of 3.12 cm in the sig figs
method, then the usual implication is that due to rounding the
uncertainty is ± 0.005 cm
even on exams, we want them to think about uncertainties