There is no such number.
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12 mm is the most precise.
measuring tape
the number on the rightthe 8 in this example30.8 is more precise than 30 or 31
The number of significant figures should be equal to the significant figures in the least precise measurement.
But according to the rules of significant figures, the least number of significant figures in any number of the problem determines the number of significant figures in the answer which, in this case, would be 11.