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1)A measurement needs both a number and a unit for complete specification because : If we just say 6, the other person will not understand what we mean; hence we have to use a unit of length. If we just say metres, the person will wonder how many metres; therefore we have to tell the number to express the right quantity.
2)A pace or a footstep cannot be used as a standard unit of length because the length of footstep, forearm length and hand span of different person is different. ... So footsteps and other such measuring systems cannot be use as standard unit.
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