If written as 1 mm there is no need for any preceding 0s.
There are 10 millimeters in one centimeter.
1 inch = 25.4 milimeters. 25.4there are 1,000 milimeters in an inch
32
1000
304.8mm
one thousand
1000
10,000 millimeters
one thousand 1,000
6.35 mm.
10 milimeters is a centimeter
1000 mm3 in cm3