There are 25.4 millimetres in one inch. Therefore, to convert between millimetres and inches, divide by 25.4. For example, rounded to two decimal places, 640 millimetres is approximately equal to 640/25.4 = 25.20 inches.
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There are 25.4 millimetres in an inch. Therefore, to convert inches to millimetres, multiply by 25.4.
For example, 2 millimetres is equal to 2 x 25.4 = 50.8 millimetres.