I've learned about them in school, but I've never heard anyone say something is 8 decameters long or anything like that. I'm an American.

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[–] 26 points 2 years ago* (last edited 2 years ago) (1 child)

Valid, but rarely used, as it's usually just as fast to say "two hundred meters" instead of "two hecto meters".

However, those prefixes have other (non-SI) uses. A hectare is common way of referring to a 100x100 meter area. And a decare is 10 ares, i.e. 0.1 hectare.

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  • [–] 19 points 2 years ago (2 children)