Lady Laura 
Poul-Henning KampDanish: Nine and half five twenty
Ditolnine plus halfway (from four) to five times twenty
twenty used to be a very common number in trade, it was called "en snes"
@bsdphk
You mean 9+4,5*20? Okay, this is hard to beat.
Weird, but 100% systematic from 50 to 99:
51 = 1 + 2.5*20
64 = 4 + 3*20
72 = 2 + 3.5*20
87 = 7 + 4 * 20
@bsdphk
We need to update the meme: Danish comes in with a flamethrower.
Sir Toootenstein
proedie
Bodhipaksa@bsdphk @ditol @cmconseils The half thing is like the system of telling the time in Germany and some parts of rural Scotland, where “half five” for example means 4:30 rather than 5:30.
@bodhipaksa
Thanks, now it starts making sense at least. :)
@bodhipaksa
Btw., it's not only German and Scots: it's the same in Ukrainian and Russian (and probably other Slavic languages, but I don't speak them, so no way to tell certainly).
Titia Schuurman@bsdphk @ditol @cmconseils
I believe it is "score" in English, as in the Gettysburg Address:
"Four score and seven years ago our fathers brought forth on this continent, a new nation, conceived in Liberty, and dedicated to the proposition that all men are created equal."
Which would give us, in this case, "four-and-a-half-score and nine".
Yes, same thing.
Sarah Peper 🏳️⚧️🇺🇦@bsdphk @cmconseils I came here to say this
rhempel@bsdphk @cmconseils it's more like 9 and halfway from 80 to 100.
Halv fems is taken as half of the twenty that is 5 * 20.
Halv tres is half of the twenty that is 3 * 20.
It was confusing as hell until I got used to it :-)
Elch@bsdphk @cmconseils Welsh (traditional): four on fifteen and fourtwenty