In the SI system, the micrometer (one thousandth of a millimeter) and nanometer (one thousandth of a micrometer) are used. Outside the SI system, the ångström is also used - it is one tenth of a nanometer, and is useful for measuring atomic distances.
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Something that is a milimetre long....
0.1mm
1 milimetre is equal to 0.001 metre
0.01 is smaller than 0.2
10 mm to a cm, 57 cm = 57 x 10 mm, over to you.