6 millimeters is already rounded to the nearest thousandth of a millimeter.
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For example to round 1.465 to the nearest hundredth you look at the thousandth (5) if it is bigger than 5 then you round the hundredth (6) to 7. So your example answer would be 1.47
8.660
one-sixth as decimal nearest thousandth = 0.1671/6:= 1÷ 6= 0.167 in decimal
12.66
5.159