OK, I get it.
You could take this further, and convert it to a String to display the unit as well.
The below example converts the rounded value to 3 decimal place accuracy and adds "AR: " to its beginning, and " m2" to its end. The resulting string type Property can be displayed in both Zone Stamps and Schedules:
CONCAT ( "AR: ", STR ( MROUND ( STRTONUM ( STRCALCUNIT ( {Property:Zone/Measured Area} ) ), 0.5 ), 3 ), " m2" )
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