The only thing to know is: 1 c(enti)m(eter) equals to 10 m(illi)m(eter) because
9,1 cm = 9,1 * (10 mm) = 9,1 * 10 mm = 91 mm
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304.8 mm
100 cm equals to 1000 mm
9
To convert centimeters to millimeters, you multiply by 10 since there are 10 millimeters in a centimeter. Therefore, 68 cm is equal to 680 mm.
.05 mm equals 50 μm (1000 x .05).