Non-standard units for measurement are often used in introducing classes on the topic of ‘Measurement’, what could be the reason for the same? Choose the most appropriate option.
1
Many people still use non - standard units of measurement.
2
Non - standard units provide a good rationale for the need of a standard unit.
3
They have no other relevance but to add some fun in a boring mathematics class.
4
Use of non - standard units is the only way to provide some concrete experience to children with special needs before teaching measurement.