> By omitting digits after the decimal you are misleading people into believing that your number is more accurate than it really is. Digits omitted at the righ

> By omitting digits after the decimal you are misleading people into believing that your number is more accurate than it really is. Digits omitted at the right mean we don't know them, not that they are zero. > and convert that back to Celsius you end up with 54.85°C instead of the original 54.4°C. Yes, inaccuracy accumulates when you convert back and forth. But it's common practice in physics not to increase the number of significant digits to not give the impression a measurement is more precise than it actually is. In this specific case: https://en.wikipedia.org/wiki/Significance_arithmetic#Multiplication_and_division_using_significance_arithmetic https://en.wikipedia.org/wiki/Significance_arithmetic#Multip... And when precision really matters, then one should explicit the range (eg. +/- after the absolute unit)