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On a meter scale we have divisions in terms of centimeters and millimeters.

We have the smallest measurement being a millimeter.  So
we can write the measurement as  4.2 centimeters,  42 millimeters or 0.42 meters.

we do not have measurement accuracy to 0.1 millmeters, so we cannot write 42.0 mm or  4.20 mm..
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