A metre.
miles or kilomiters
A metres, for an approximate measure, a centimetre for a more accurate measure.
I would use a centimetre to measure the length of a boy. Not sure what a boy yard is, though.
centimeters
sorry i press the wrong words the anwer is gram * * * * * A gram is a measure of mass, not of length! I would use a centimetre.
You would use inches or centimeters to measure the length and width of a skateboard.
A metre.
You could measure the length of a lunchroom in feet or meters, depending on which unit of measurement you prefer to use.
Inches
cm
The ISO length unit to use would be the cementer.
I would use feet
You would use meters.
a cm
You would use the SI unit meter (m) to measure the length of a DVD case.
miles or kilomiters