20 inch
You can invent any number of nonstandard units, but none of them is "best". It is best to use standard units, that is, the meter.
4-5 1/2 meters
Measurement error: obviously!
Whole numbers are the best representation of students.
metres would be the best way to work out the length of a classroom as centimetres are to small and kilometres are far to large
Yard
Answer: meters
200mm
A millimetre.
milimeters
9 cm
You can invent any number of nonstandard units, but none of them is "best". It is best to use standard units, that is, the meter.
It's Yard
in miles
Inches or centimeters.
20 centimeters 1meter 4 decimeters 1 kilometers
230 miles