How to convert 509 millimeters to centimeters?
We know (by definition) that:
We can set up a proportion to solve for the number of centimeters.
Now, we cross multiply to solve for our unknown :
Conversion in the opposite direction
The inverse of the conversion factor is that 1 centimeter is equal to 0.0196463654223969 times 509 millimeters.
It can also be expressed as: 509 millimeters is equal to centimeters.
An approximate numerical result would be: five hundred and nine millimeters is about zero centimeters, or alternatively, a centimeter is about zero point zero two times five hundred and nine millimeters.
 The precision is 15 significant digits (fourteen digits to the right of the decimal point).Results may contain small errors due to the use of floating point arithmetic.