Because measurements in a large unit will lead to a very small fractional value.
For example, my height is 0.00178 kilometres or 0.001106 miles. Or, to use an even larger unit, it is 0.00000000000000005769 parsecs.
Much easier to say 1.78 metres or 178 cm, or 5 ft 10 inches.
In the metric system, though, if the measurement is given in scientific notation, it does not make too big a difference. My height is 1.78 metres or 1.78*10-3 kilometres or 1.78*109 nanometres.
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The answer will depend on the two units. It will entail multiplication by a number that is greater than 1 (or division by a number smaller than 1).
You multiply however many bigger units you have by the number of smaller units per bigger unit. For example: If you wish to convert 3 metres to centimetres then you multiply 3 by 100 (as there are 100 centimetres in a metre) to result in 300cm.
Multiplication is used when changing from SI units to smaller units. For example, to convert 35.8kg to grams, you would do the following: (35.8kg) x (1000g/kg) = 35800g (The kilograms cancel, leaving grams.) To convert 0.823m to centimeters, you would do the following: (0.823m) x (100cm/m) = 82.3cm (The meters cancel, leaving centimeters.)
Not really, since roman numerals don't have units smaller then one.
It doesn't make sense to convert that. You can only convert units of the same kind, e.g., units of length to units of length; units of area to units of area; units of time to units of time, etc.