That depends what there are 4.2 of - if there are 4.2 centimetres, this is equal to 4.2 x 10 = 42 millimetres.
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It is 13.
To the nearest integer, 42 To the nearest ten, 40
42.1 rounded to the nearest unit or nearest one is 42.
59.82 mm
6 millimeters is already rounded to the nearest thousandth of a millimeter.