Meters. Or - since it is probably less than a meter - some subunit, such as centimeters or millimeters.
Inches
METERS!!!The unit of measurement you would use to measure the width of your classroom is meters.
ruler
Millimetres, centimetres or inches
Kilometres
inches or centimeters. depends
METERS!!!The unit of measurement you would use to measure the width of your classroom is meters.
Centimetre.
Parsecs
ruler
I would use meters.
millimetres or even micrometres.
centimetre
inches
Kilometres
inches or centimeters. depends
Feet or meters
Millimetres, centimetres or inches