0.66141 is the same as (66141/100000)
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its 1/1
The answer depends on 0.512 WHAT! You will get different fractions of an inch from 0.512 miles and 0.512 microns.
3 1/4
if each mark is 1/16 inch then 4 marks is 4/16 inch = 1/4 inch
Because people sometimes want to measure things that are smaller than an inch, or because they are not a whole number of inches long.