Why don't we measure all lengths in just one standard unit of length such as the metre,instead of having multiples and submultiples.
Please tell me as quickly as you can as tomorrow is my exam.

Because the value can be very very small, e.g. 0.0000000000001 and could be very very large also, e.g. 1000000000000000, which is quite difficult to write. So, they are written in multiples as it is convenient to write in that work.

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