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.)
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When changing from a larger unit to a smaller unit, there will be more of them, so you will multiply.
more smaller units than the bigger units
It depends on what you are measureing. If you are measuring distance the mathematical untis would be meters or feet. If you are measuring time the units would be seconds. If you were measuring mass the units would be grams. If you were measuring speed the units would be a combination of distance and time which is meters per seconds or feet per seconds. Mathematical units just tell what variation a certain number has. Ex. 3meters 3feet 3yards these are have the same number but different units and therefore that means they are all different measurements. It all depends on the units.
Yes, there are units smaller than a yoctometer. The yoctometer (10^-24 meters) is part of the metric system, and smaller units can be defined using scientific notation, such as zeptometer (10^-21 meters) or even smaller hypothetical units, like the Planck length, which is approximately 1.616 x 10^-35 meters. However, these smaller units are primarily theoretical and not commonly used in practical measurements.
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).