In general, a mathematical operation like division, multiplication or converting a measurement from one unit to another can not make a measurement more precise. The precision was determined when the measurement was made. But there are some exceptions.
The simplest way is to take a number of measurements of the same thing and average them. The average will be more precise than any individual measurement. However, taking a number of measurements of the same thing is not as simple as it may seem. For example, simply making the measurement often changes the thing you are measuring.
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Last revised: 16 July 2004.