25.354 inches

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.

\(644mm/25.4\frac{{mm}}{{in}} = 25.354inches\)

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