This question cannot be answered sensibly. A square metre (sqm) is a measure of area, with dimensions [L2]. A millimetre (mm) is a measure of distance, with dimensions [L]. Basic dimensional analysis teaches that you cannot convert between measures with different dimensions such as these without additional information.
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18cm convert into mm
19 mm. To convert cm to mm multiply by 10, to convert mm to cm divide by 10.
To convert mm to meters, divide by 1000. 331.213 mm / 1000 mm/meter = 0.331213 meters
Multiply by 100
To convert millimeters to meter: Divide the given measure in millimeter by 1000. Example: Convert 123mm to m. 123 mm * 1 m/1000 mm = 0.123m