It’s base 20 like in France, plus the quirk that we have an ordinal numeral way of saying half integers, i.e. 1.5 is “half second”, 2.5 is “half third”, 4.5 is “half fifth”. So 92 is said as “two and half fifth times twenty”. We’ve since made the “times twenty” implicit for maximum confusion, so it’s just said as “two and half fifths”.

Also, the ordinal numeral system for halves is only really used for 1.5 these days, so the numbers don’t really make sense to anyone. When speaking to other Scandinavians, we often just say “two and nine ten”.

Why don’t we just change it to the more sensible system then? Because language is stubborn.

1.5 is “half second”, 2.5 is “half third”, 4.5 is “half fifth”

Interesting. Regionally, some Germans measure time like this, i.e. “half two” is 01:30 resp. 13:30. (Which is different from English, where people who say “half two” mean “half past two”.)

We’ve since made the “times twenty” implicit for maximum confusion, so it’s just said as “two and half fifths”.

I know very little about Danish, but I learned that Danes slur the middle of most words. So I suspect you actually pronounce even less of the word than you’d write…?

Because language is stubborn.

Belgian French gives me hope.

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[Edited: Usage is not regional]

Regionally, some Germans measure time like this, i.e. “half two” is 01:30 resp. 13:30.

This isn’t regional nor “some”, I never met a German wo doesn’t. Sure, there is “13 o’clock 30” and both are valid but I’d say the default is still the half system.

When it comes to quarters, there are regional differences and it’s a common “ice breaker” or small talk topic when people from all over Germany come together.