You could measure with
Kilometers, Deckameters,hectometers,meters,decimeters,centimeters,millimeters, or micrometers.
To give you an idea, one centimeter is equal to 2.54 inches.
There are about three feet in one meter.
Kilometres
Yards if you work in imperial units or metres if you work in metric units
meter
METERS!!!The unit of measurement you would use to measure the width of your classroom is meters.
ruler
mm
centimetre
Kilometres
Metres, to measure its length or width, square metres to measure its area.
I would go with millimetres
None! I would measure in centimeters if I were you!
the metric system
The width of a pencil would be the metric unit of centimeters
Most like a vernier caliper for accurate readings
The metric unit of the meter would be the appropriate measure of the area of classroom. Calculating area involves multiplying the length (in meters) of the classroom's length and width. Area of the classroom would be in square (^2) meters.
Yards if you work in imperial units or metres if you work in metric units
Millimetres (or centimetres to one decimal place).