What is 5.5 cms in mms?
A "cms" (Centimeter) is one hundredth of a Meter
A "mms" (Millimeter) is one thousandth of a Meter
Therefore if you have Meters and want them in Centimeters you
multiply by 100, if you want them in Millimeters you multiply by
1000.
And it follows that if you have Centimeters and want them in
Millimeters you multiply by 100 or if you want them in Meters you
divide by 100.
And if you have Millimeters and want them in Centimeters you
divide by 100 or if you want them in Meters you divide by 1000.
This information answers your question, but you have to do a
simple sum yourself.