Centimeters
Meter is used in finding the width of the blackboard.
To measure the width of bed, the unit meter can be used. It can also be measured in feet and inches.
Identify the SI until you would use the measured the width of your classroom
centimeters
The metric unit used for measuring the width of a fingernail is usually millimeters (mm).
The estimating unit of measure for the width of a fingernail is typically in millimeters (mm) or centimeters (cm). Some may also use inches (in) as a measurement unit, but millimeters are the most commonly used unit for the width of a fingernail.
The width of a pin would typically be measured in millimeters (mm).
Millimetres (or centimetres to one decimal place).
Pencil lead is very narrow. Millimeter can be used to measure it.
Meters or feet are commonly used to measure the width of a house.
Any unit of length can be used. The most convenient number is probably the result of using inches or centimeters.
The SI unit used for measuring width is meters (m).