I still own my slide rule, an Aristo Studio Log bought in 1966..

In those times, we were introduced to it by our physics teacher, and we exercised in what we called "Big Hunt": trying to get a rough solution without the rule, then use it for an accurate result.

In fact, the results were enough accurate for all electronic work, assuming that the order of magnitude was correct (the rule was not giving the full result, we had to calculate the decimal position by ourselves..).

Best regards