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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[–] 13 points 2 years ago* (last edited 2 years ago) (2 children)

In France "hectare" (10 000m²) is used for fields and burning forest. Beside that deca or hectometers are never used

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