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It isn't technically necessary; it is used for convenience, to avoid using very small or very large numbers.

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9y ago
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Q: Why is it often necessary to use multiples and sub multiples of a standard unit?
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The stanard unit of length in the metric system?

mm,cm,m,kmA2, The Standard unit of length is the Metre. This can have applied the common multiples and sub-multiples, such as Mega and milli etc.


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