Please don't scare them!
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It's deca, not deka
Not in German 😶
It's universal. That's the point. German or not, it's deca
No the 'da' is universal for '×10'. In german for example it's also Mikro and languages can translate their prefixes as they want, as long as 1 km means 1000 meters and 1 ng means 1×10^-9 grams it is right by the International System of Units.