There is no prefix at all, its just leave as is.
SI means 'system internationale'. It is the French acronym for the International System of Units, from which the Metric units(metres, centimetres) came from.
Its french. Système International [d'Unités] International system
Hekto.
Centi means a hundredth of something. Examples are centimeter (a hundredth of a meter) and centigrams (a hundredth of a gram).
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