Explanation
There are 2.54 centimeters (cm) per inch and 10 millimeters (mm) in a centimeter so there are \(2.54 \mathrm{~cm} \times \frac{10 \mathrm{~mm}}{1 \mathrm{~cm}}=25.4 \mathrm{~mm}\) in an inch.
\( 8in \times 25.4\frac{{mm}}{{in}} = 203.2 \text {millimeters}\)