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*) Very often, in class and in the real world, it is not
necessary to quantify the uncertainty, so long as it is
known to be /small enough/ i.e. within tolerances. Unless
and until you hear otherwise, you (the student) should
report temperatures within ±2 °C, mass, length, and time
within ±2%, et cetera. Use as many or as few digits as
you please, so long as the bottom-line answer is within
those tolerances.
The tolerance-based approach allows everybody to focus on
the physics, rather than on useless side-issues.