The estimating unit of measurement in question is the millimeter, or mm.
Millimetres.
None! I would measure in centimeters if I were you!
To measure the width of bed, the unit meter can be used. It can also be measured in feet and inches.
Centimeter
millimetres or even micrometres.
Millimetres.
ruler
A centimeter is about the width of a fingernail
None! I would measure in centimeters if I were you!
Millimeters
centimeters
appropriate unit to measure the width of a textbook = ce ntimeters
Mm
To measure the width of bed, the unit meter can be used. It can also be measured in feet and inches.
Centimetre.
Parsecs
Meter is used in finding the width of the blackboard.