Never underestimate the power of CPAN:
Math::SigFigs - do math with correct handling of significant figures
In many scientific applications, it is often useful to be
able to format numbers with a given number of significant
figures, or to do math in such a way as to maintain the
correct number of significant figures. The rules for
significant figures are too complicated to be handled
solely using the sprintf function (unless you happen to be
Randal Schwartz :-).
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